たなしょのメモ

日々勉強していることをつらつらと

OS作成奮闘記day20

本書ではday17にはいりました。
アイドルタスクを作るところから始めたいと思います。    mtask.c

void task_idle(void)
{
    for (;;) {
        io_hlt();
    }
}

struct TASK *task_init(struct MEMMAN *memman)
{
    int i;
    struct TASK *task, *idle;
    struct SEGMENT_DESCRIPTOR *gdt = (struct SEGMENT_DESCRIPTOR *) ADR_GDT;

    taskctl = (struct TASKCTL *) memman_alloc_4k(memman, sizeof (struct TASKCTL));
    for (i = 0; i < MAX_TASKS; i++) {
        taskctl->tasks0[i].flags = 0;
        taskctl->tasks0[i].sel = (TASK_GDT0 + i) * 8;
        set_segmdesc(gdt + TASK_GDT0 + i, 103, (int) &taskctl->tasks0[i].tss, AR_TSS32);
    }
    for (i = 0; i < MAX_TASKLEVELS; i++) {
        taskctl->level[i].running = 0;
        taskctl->level[i].now = 0;
    }

    task = task_alloc();
    task->flags = 2;    /* 動作中マーク */
    task->priority = 2; /* 0.02秒 */
    task->level = 0;    /* 最高レベル */
    task_add(task);
    task_switchsub();   /* レベル設定 */
    load_tr(task->sel);
    task_timer = timer_alloc();
    timer_settime(task_timer, task->priority);

    idle = task_alloc();
    idle->tss.esp = memman_alloc_4k(memman, 64 * 1024) + 64 * 1024;
    idle->tss.eip = (int) &task_idle;
    idle->tss.es = 1 * 8;
    idle->tss.cs = 2 * 8;
    idle->tss.ss = 1 * 8;
    idle->tss.ds = 1 * 8;
    idle->tss.fs = 1 * 8;
    idle->tss.gs = 1 * 8;
    task_run(idle, MAX_TASKLEVELS - 1, 1);
    
    return task;
}

bootpack.c

init_palette();
    shtctl = shtctl_init(memman, binfo->vram, binfo->scrnx, binfo->scrny);
    task_a = task_init(memman);
    fifo.task = task_a;
    task_run(task_a, 1, 2);

    /* sht_back */
    sht_back  = sheet_alloc(shtctl);
    buf_back  = (unsigned char *) memman_alloc_4k(memman, binfo->scrnx * binfo->scrny);
    sheet_setbuf(sht_back, buf_back, binfo->scrnx, binfo->scrny, -1); /* 透明色なし */
    init_screen8(buf_back, binfo->scrnx, binfo->scrny);

    /* sht_win_b */
    for (i = 0; i < 3; i++) {
        sht_win_b[i] = sheet_alloc(shtctl);
        buf_win_b = (unsigned char *) memman_alloc_4k(memman, 144 * 52);
        sheet_setbuf(sht_win_b[i], buf_win_b, 144, 52, -1); /* 透明色なし */
        sprintf(s, "task_b%d", i);
        make_window8(buf_win_b, 144, 52, s, 0);
        task_b[i] = task_alloc();
        task_b[i]->tss.esp = memman_alloc_4k(memman, 64 * 1024) + 64 * 1024 - 8;
        task_b[i]->tss.eip = (int) &task_b_main;
        task_b[i]->tss.es = 1 * 8;
        task_b[i]->tss.cs = 2 * 8;
        task_b[i]->tss.ss = 1 * 8;
        task_b[i]->tss.ds = 1 * 8;
        task_b[i]->tss.fs = 1 * 8;
        task_b[i]->tss.gs = 1 * 8;
        *((int *) (task_b[i]->tss.esp + 4)) = (int) sht_win_b[i];
        /* task_run(task_b[i], 2, i + 1); */
    }

Makefile

OBJS_BOOTPACK = bootpack.obj naskfunc.obj hankaku.obj graphic.obj dsctbl.obj \
                int.obj fifo.obj keybord.obj mouse.obj memory.obj sheet.obj timer.obj \
                mtask.obj

TOOLPATH = ..\..\z_tools\\

INCPATH  = ..\..\z_tools\haribote\\

MAKE     = $(TOOLPATH)make.exe -r
NASK     = $(TOOLPATH)nask.exe
CC1      = $(TOOLPATH)cc1.exe -I$(INCPATH) -Os -Wall -quiet
GAS2NASK = $(TOOLPATH)gas2nask.exe -a
OBJ2BIM  = $(TOOLPATH)obj2bim.exe
MAKEFONT = $(TOOLPATH)makefont.exe
BIN2OBJ  = $(TOOLPATH)bin2obj
BIM2HRB  = $(TOOLPATH)bim2hrb.exe
RULEFILE = $(TOOLPATH)haribote\haribote.rul
EDIMG    = $(TOOLPATH)edimg.exe
IMGTOL   = $(TOOLPATH)imgtol.com
COPY     = cmd.exe /C copy
DEL      = rm -f


# default operation
default:
    $(MAKE) img

# file making rule

ipl10.bin : ipl10.nas Makefile
    $(NASK) ipl10.nas ipl10.bin ipl10.lst

asmhead.bin : asmhead.nas Makefile
    $(NASK) asmhead.nas asmhead.bin asmhead.lst

hankaku.bin : hankaku.txt Makefile
    $(MAKEFONT) hankaku.txt hankaku.bin

hankaku.obj : hankaku.bin Makefile
    $(BIN2OBJ) hankaku.bin hankaku.obj _hankaku

bootpack.bim : $(OBJS_BOOTPACK) Makefile
    $(OBJ2BIM) @$(RULEFILE) out:bootpack.bim stack:3136k map:bootpack.map \
        $(OBJS_BOOTPACK)
# 3MB+64KB=3136KB

bootpack.hrb : bootpack.bim Makefile
    $(BIM2HRB) bootpack.bim bootpack.hrb 0

haribote.sys : asmhead.bin bootpack.hrb Makefile
    cat asmhead.bin bootpack.hrb > haribote.sys

haribote.img : ipl10.bin haribote.sys Makefile
    $(EDIMG)   imgin:..\..\z_tools\fdimg0at.tek \
        wbinimg src:ipl10.bin len:512 from:0 to:0 \
        copy from:haribote.sys to:@: \
        imgout:haribote.img

# rules
%.gas : %.c Makefile
    $(CC1) -o $*.gas $*.c

%.nas : %.gas Makefile
    $(GAS2NASK) $*.gas $*.nas

%.obj : %.nas Makefile
    $(NASK) $*.nas $*.obj $*.lst

# command

img :
    $(MAKE) haribote.img

run :
    $(MAKE) img
    $(COPY) haribote.img ..\..\z_tools\qemu\fdimage0.bin
    $(MAKE) -C ..\..\z_tools\qemu

install :
    $(MAKE) img
    $(IMGTOL) w a: haribote.img

clean :
    -$(DEL) *.bin
    -$(DEL) *.lst
    -$(DEL) *.obj
    -$(DEL) bootpack.map
    -$(DEL) bootpack.bim
    -$(DEL) bootpack.hrb
    -$(DEL) haribote.sys

src_only :
    $(MAKE) clean
    -$(DEL) haribote.img

次はコンソール画面を出してみたいと思います。
bootpack.c

void HariMain(void)
{
    struct BOOTINFO *binfo = (struct BOOTINFO *) ADR_BOOTINFO;
    struct FIFO32 fifo;
    struct SHTCTL *shtctl;
    char s[40];
    int fifobuf[128];
    int mx, my, i, cursor_x, cursor_c;
    unsigned int memtotal;
    struct MOUSE_DEC mdec;
    struct MEMMAN *memman = (struct MEMMAN *) MEMMAN_ADDR;
    static char keytable[0x54] = {
        0,   0,   '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '-', '^', 0,   0,
        'Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'I', 'O', 'P', '@', '[', 0,   0,   'A', 'S',
        'D', 'F', 'G', 'H', 'J', 'K', 'L', ';', ':', 0,   0,   ']', 'Z', 'X', 'C', 'V',
        'B', 'N', 'M', ',', '.', '/', 0,   '*', 0,   ' ', 0,   0,   0,   0,   0,   0,
        0,   0,   0,   0,   0,   0,   0,   '7', '8', '9', '-', '4', '5', '6', '+', '1',
        '2', '3', '0', '.'
    };
    unsigned char *buf_back, buf_mouse[256], *buf_win, *buf_cons;
    struct SHEET *sht_back, *sht_mouse, *sht_win, *sht_cons;
    struct TASK *task_a, *task_cons;
    struct TIMER *timer;

    init_gdtidt();
    init_pic();
    io_sti(); /* IDT/PICの初期化が終わったのでCPUの割り込み禁止を解除 */
    fifo32_init(&fifo, 128, fifobuf, 0);
    init_pit();
    init_keyboard(&fifo, 256);
    enable_mouse(&fifo, 512, &mdec);
    io_out8(PIC0_IMR, 0xf8); /* PITとPIC1とキーボードを許可(11111000) */
    io_out8(PIC1_IMR, 0xef); /* マウスを許可(11101111) */

    memtotal = memtest(0x00400000, 0xbfffffff);
    memman_init(memman);
    memman_free(memman, 0x00001000, 0x0009e000); /* 0x00001000 - 0x0009efff */
    memman_free(memman, 0x00400000, memtotal - 0x00400000);

    init_palette();
    shtctl = shtctl_init(memman, binfo->vram, binfo->scrnx, binfo->scrny);
    task_a = task_init(memman);
    fifo.task = task_a;
    task_run(task_a, 1, 2);

    /* sht_back */
    sht_back  = sheet_alloc(shtctl);
    buf_back  = (unsigned char *) memman_alloc_4k(memman, binfo->scrnx * binfo->scrny);
    sheet_setbuf(sht_back, buf_back, binfo->scrnx, binfo->scrny, -1); /* 透明色なし */
    init_screen8(buf_back, binfo->scrnx, binfo->scrny);

    /* sht_cons */
    sht_cons = sheet_alloc(shtctl);
    buf_cons = (unsigned char *) memman_alloc_4k(memman, 256 * 165);
    sheet_setbuf(sht_cons, buf_cons, 256, 165, -1); /* 透明色なし */
    make_window8(buf_cons, 256, 165, "console", 0);
    make_textbox8(sht_cons, 8, 28, 240, 128, COL8_000000);
    task_cons = task_alloc();
    task_cons->tss.esp = memman_alloc_4k(memman, 64 * 1024) + 64 * 1024 - 8;
    task_cons->tss.eip = (int) &console_task;
    task_cons->tss.es = 1 * 8;
    task_cons->tss.cs = 2 * 8;
    task_cons->tss.ss = 1 * 8;
    task_cons->tss.ds = 1 * 8;
    task_cons->tss.fs = 1 * 8;
    task_cons->tss.gs = 1 * 8;
    *((int *) (task_cons->tss.esp + 4)) = (int) sht_cons;
    task_run(task_cons, 2, 2); /* level=2, priority=2 */
    
    /* sht_win */
    sht_win   = sheet_alloc(shtctl);
    buf_win   = (unsigned char *) memman_alloc_4k(memman, 160 * 52);
    sheet_setbuf(sht_win, buf_win, 144, 52, -1); /* 透明色なし */
    make_window8(buf_win, 144, 52, "task_a", 1);
    make_textbox8(sht_win, 8, 28, 128, 16, COL8_FFFFFF);
    cursor_x = 8;
    cursor_c = COL8_FFFFFF;
    timer = timer_alloc();
    timer_init(timer, &fifo, 1);
    timer_settime(timer, 50);

    /* sht_mouse */
    sht_mouse = sheet_alloc(shtctl);
    sheet_setbuf(sht_mouse, buf_mouse, 16, 16, 99);
    init_mouse_cursor8(buf_mouse, 99);
    mx = (binfo->scrnx - 16) / 2; /* 画面中央になるように座標計算 */
    my = (binfo->scrny - 28 - 16) / 2;

    sheet_slide(sht_back,  0,  0);
    sheet_slide(sht_cons, 32,  4);
    sheet_slide(sht_win,  64, 56);
    sheet_slide(sht_mouse, mx, my);
    sheet_updown(sht_back,  0);
    sheet_updown(sht_cons,  1);
    sheet_updown(sht_win,   2);
    sheet_updown(sht_mouse, 3);
    sprintf(s, "(%3d, %3d)", mx, my);
    putfonts8_asc_sht(sht_back, 0, 0, COL8_FFFFFF, COL8_008484, s, 10);
    sprintf(s, "memory %dMB   free : %dKB",
            memtotal / (1024 * 1024), memman_total(memman) / 1024);
    putfonts8_asc_sht(sht_back, 0, 32, COL8_FFFFFF, COL8_008484, s, 40)
void console_task(struct SHEET *sheet)
{
    struct FIFO32 fifo;
    struct TIMER *timer;
    struct TASK *task = task_now();

    int i, fifobuf[128], cursor_x = 8, cursor_c = COL8_000000;
    fifo32_init(&fifo, 128, fifobuf, task);

    timer = timer_alloc();
    timer_init(timer, &fifo, 1);
    timer_settime(timer, 50);

    for (;;) {
        io_cli();
        if (fifo32_status(&fifo) == 0) {
            task_sleep(task);
            io_sti();
        } else {
            i = fifo32_get(&fifo);
            io_sti();
            if (i <= 1) { /* カーソル用タイマ */
                if (i != 0) {
                    timer_init(timer, &fifo, 0); /* 次は0を */
                    cursor_c = COL8_FFFFFF;
                } else {
                    timer_init(timer, &fifo, 1); /* 次は1を */
                    cursor_c = COL8_000000;
                }
                timer_settime(timer, 50);
                boxfill8(sheet->buf, sheet->bxsize, cursor_c, cursor_x, 28, cursor_x + 7, 43);
                sheet_refresh(sheet, cursor_x, 28, cursor_x + 8, 44);
            }
        } 
    }
}

bootpack.h]

/* mtask.c */
#define MAX_TASKS       1000    /* 最大タスク数 */
#define TASK_GDT0       3       /* TSSをGDTの何番から割り当てるのか */
#define MAX_TASKS_LV    100
#define MAX_TASKLEVELS  10
struct TSS32 {
    int backlink, esp0, ss0, esp1, ss1, esp2, ss2, cr3;
    int eip, eflags, eax, ecx, edx, ebx, esp, ebp, esi, edi;
    int es, cs, ss, ds, fs, gs;
    int ldtr, iomap;
};
struct TASK {
    int sel, flags; /* selはGDTの番号のこと */
    int level, priority;
    struct TSS32 tss;
};
struct TASKLEVEL {
    int running; /* 動作しているタスクの数 */
    int now; /* 現在動作しているタスクがどれだか分かるようにするための変数 */
    struct TASK *tasks[MAX_TASKS_LV];
};
struct TASKCTL {
    int now_lv; /* 現在動作中のレベル */
    char lv_change; /* 次回タスクスイッチのときに、レベルも変えたほうがいいかどうか */
    struct TASKLEVEL level[MAX_TASKLEVELS];
    struct TASK tasks0[MAX_TASKS];
};
extern struct TIMER *task_timer;
struct TASK *task_now(void);
struct TASK *task_init(struct MEMMAN *memman);
struct TASK *task_alloc(void);
void task_run(struct TASK *task, int level, int priority);
void task_switch(void);
void task_sleep(struct TASK *task);

コンソール画面がでました。

さらにコンソール画面を改良していきます。
bootpack.c

/* bootpackのメイン */

#include "bootpack.h"
#include <stdio.h>

void make_window8(unsigned char *buf, int xsize, int ysize, char *title, char act);
void putfonts8_asc_sht(struct SHEET *sht, int x, int y, int c, int b, char *s, int l);
void make_textbox8(struct SHEET *sht, int x0, int y0, int sx, int sy, int c);
void make_wtitle8(unsigned char *buf, int xsize, char *title, char act);
void console_task(struct SHEET *sheet);

void HariMain(void)
{
    struct BOOTINFO *binfo = (struct BOOTINFO *) ADR_BOOTINFO;
    struct FIFO32 fifo;
    struct SHTCTL *shtctl;
    char s[40];
    int fifobuf[128];
    int mx, my, i, cursor_x, cursor_c;
    unsigned int memtotal;
    struct MOUSE_DEC mdec;
    struct MEMMAN *memman = (struct MEMMAN *) MEMMAN_ADDR;
    static char keytable[0x54] = {
        0,   0,   '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '-', '^', 0,   0,
        'Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'I', 'O', 'P', '@', '[', 0,   0,   'A', 'S',
        'D', 'F', 'G', 'H', 'J', 'K', 'L', ';', ':', 0,   0,   ']', 'Z', 'X', 'C', 'V',
        'B', 'N', 'M', ',', '.', '/', 0,   '*', 0,   ' ', 0,   0,   0,   0,   0,   0,
        0,   0,   0,   0,   0,   0,   0,   '7', '8', '9', '-', '4', '5', '6', '+', '1',
        '2', '3', '0', '.'
    };
    unsigned char *buf_back, buf_mouse[256], *buf_win, *buf_cons;
    struct SHEET *sht_back, *sht_mouse, *sht_win, *sht_cons;
    struct TASK *task_a, *task_cons;
    struct TIMER *timer;
    int key_to = 0;

    init_gdtidt();
    init_pic();
    io_sti(); /* IDT/PICの初期化が終わったのでCPUの割り込み禁止を解除 */
    fifo32_init(&fifo, 128, fifobuf, 0);
    init_pit();
    init_keyboard(&fifo, 256);
    enable_mouse(&fifo, 512, &mdec);
    io_out8(PIC0_IMR, 0xf8); /* PITとPIC1とキーボードを許可(11111000) */
    io_out8(PIC1_IMR, 0xef); /* マウスを許可(11101111) */

    memtotal = memtest(0x00400000, 0xbfffffff);
    memman_init(memman);
    memman_free(memman, 0x00001000, 0x0009e000); /* 0x00001000 - 0x0009efff */
    memman_free(memman, 0x00400000, memtotal - 0x00400000);

    init_palette();
    shtctl = shtctl_init(memman, binfo->vram, binfo->scrnx, binfo->scrny);
    task_a = task_init(memman);
    fifo.task = task_a;
    task_run(task_a, 1, 2);

    /* sht_back */
    sht_back  = sheet_alloc(shtctl);
    buf_back  = (unsigned char *) memman_alloc_4k(memman, binfo->scrnx * binfo->scrny);
    sheet_setbuf(sht_back, buf_back, binfo->scrnx, binfo->scrny, -1); /* 透明色なし */
    init_screen8(buf_back, binfo->scrnx, binfo->scrny);

    /* sht_cons */
    sht_cons = sheet_alloc(shtctl);
    buf_cons = (unsigned char *) memman_alloc_4k(memman, 256 * 165);
    sheet_setbuf(sht_cons, buf_cons, 256, 165, -1); /* 透明色なし */
    make_window8(buf_cons, 256, 165, "console", 0);
    make_textbox8(sht_cons, 8, 28, 240, 128, COL8_000000);
    task_cons = task_alloc();
    task_cons->tss.esp = memman_alloc_4k(memman, 64 * 1024) + 64 * 1024 - 8;
    task_cons->tss.eip = (int) &console_task;
    task_cons->tss.es = 1 * 8;
    task_cons->tss.cs = 2 * 8;
    task_cons->tss.ss = 1 * 8;
    task_cons->tss.ds = 1 * 8;
    task_cons->tss.fs = 1 * 8;
    task_cons->tss.gs = 1 * 8;
    *((int *) (task_cons->tss.esp + 4)) = (int) sht_cons;
    task_run(task_cons, 2, 2); /* level=2, priority=2 */

    /* sht_win */
    sht_win   = sheet_alloc(shtctl);
    buf_win   = (unsigned char *) memman_alloc_4k(memman, 160 * 52);
    sheet_setbuf(sht_win, buf_win, 144, 52, -1); /* 透明色なし */
    make_window8(buf_win, 144, 52, "task_a", 1);
    make_textbox8(sht_win, 8, 28, 128, 16, COL8_FFFFFF);
    cursor_x = 8;
    cursor_c = COL8_FFFFFF;
    timer = timer_alloc();
    timer_init(timer, &fifo, 1);
    timer_settime(timer, 50);

    /* sht_mouse */
    sht_mouse = sheet_alloc(shtctl);
    sheet_setbuf(sht_mouse, buf_mouse, 16, 16, 99);
    init_mouse_cursor8(buf_mouse, 99);
    mx = (binfo->scrnx - 16) / 2; /* 画面中央になるように座標計算 */
    my = (binfo->scrny - 28 - 16) / 2;

    sheet_slide(sht_back,  0,  0);
    sheet_slide(sht_cons, 32,  4);
    sheet_slide(sht_win,  64, 56);
    sheet_slide(sht_mouse, mx, my);
    sheet_updown(sht_back,  0);
    sheet_updown(sht_cons,  1);
    sheet_updown(sht_win,   2);
    sheet_updown(sht_mouse, 3);
    sprintf(s, "(%3d, %3d)", mx, my);
    putfonts8_asc_sht(sht_back, 0, 0, COL8_FFFFFF, COL8_008484, s, 10);
    sprintf(s, "memory %dMB   free : %dKB",
            memtotal / (1024 * 1024), memman_total(memman) / 1024);
    putfonts8_asc_sht(sht_back, 0, 32, COL8_FFFFFF, COL8_008484, s, 40);

    for (;;) {
        io_cli();
        if (fifo32_status(&fifo) == 0) {
            task_sleep(task_a);
            io_sti();
        } else {
            i = fifo32_get(&fifo);
            io_sti();
            if (256 <= i && i <= 511) { /* キーボードデータ */
                sprintf(s, "%02X", i - 256);
                putfonts8_asc_sht(sht_back, 0, 16, COL8_FFFFFF, COL8_008484, s, 2);
                if (i < 0x54 + 256) {
                    if (keytable[i - 256] != 0 && cursor_x < 128) { /* 通常文字 */
                        /* 一文字表示してから、カーソルを1つ進める */
                        s[0] = keytable[i - 256];
                        s[1] = 0;
                        putfonts8_asc_sht(sht_win, cursor_x, 28, COL8_000000, COL8_FFFFFF, s, 1);
                        cursor_x += 8;
                    }
                }
                if (i == 256 + 0x0e && cursor_x > 8) { /* バックスペース */
                    /* カーソルをスペースで消してから、カーソルを1つ戻す */
                    putfonts8_asc_sht(sht_win, cursor_x, 28, COL8_000000, COL8_FFFFFF, " ", 1);
                    cursor_x -= 8;
                }
                if (i == 256 + 0x0f) { /* Tab */
                    if (key_to == 0) {
                        key_to = 1;
                        make_wtitle8(buf_win,  sht_win->bxsize,  "task_a",  0);
                        make_wtitle8(buf_cons, sht_cons->bxsize, "console", 1);
                    } else {
                        key_to = 0;
                        make_wtitle8(buf_win,  sht_win->bxsize,  "task_a",  1);
                        make_wtitle8(buf_cons, sht_cons->bxsize, "console", 0);
                    }
                    sheet_refresh(sht_win,  0, 0, sht_win->bxsize,  21);
                    sheet_refresh(sht_cons, 0, 0, sht_cons->bxsize, 21);
                }
                /* カーソルの再表示 */
                boxfill8(sht_win->buf, sht_win->bxsize, cursor_c, cursor_x, 28, cursor_x + 7, 43);
                sheet_refresh(sht_win, cursor_x, 28, cursor_x + 8, 44);
            } else if (512 <= i && i <= 767) { /* マウスデータ */
                if (mouse_decode(&mdec, i - 512) != 0) {
                    /* データが3バイト揃ったので表示 */
                    sprintf(s, "[lcr %4d %4d]", mdec.x, mdec.y);
                    if ((mdec.btn & 0x01) != 0) {
                        s[1] = 'L';
                    }
                    if ((mdec.btn & 0x02) != 0) {
                        s[3] = 'R';
                    }
                    if ((mdec.btn & 0x04) != 0) {
                        s[2] = 'C';
                    }
                    putfonts8_asc_sht(sht_back, 32, 16, COL8_FFFFFF, COL8_008484, s, 15);
                    /* マウスカーソルの移動 */
                    mx += mdec.x;
                    my += mdec.y;
                    if (mx < 0) {
                        mx = 0;
                    }
                    if (my < 0) {
                        my = 0;
                    }
                    if (mx > binfo->scrnx - 1) {
                        mx = binfo->scrnx - 1;
                    }
                    if (my > binfo->scrny - 1) {
                        my = binfo->scrny - 1;
                    }
                    sprintf(s, "(%3d, %3d)", mx, my);
                    putfonts8_asc_sht(sht_back, 0, 0, COL8_FFFFFF, COL8_008484, s, 10);
                    sheet_slide(sht_mouse, mx, my);
                    if ((mdec.btn & 0x01) != 0) {
                        /* 左ボタンを押していたら、sht_winを動かす */
                        sheet_slide(sht_win, mx - 80, my - 8);
                    }
                }
            } else if (i <= 1) { /* カーソル用タイマ */
                if (i != 0) {
                    timer_init(timer, &fifo, 0); /* 次は0を */
                    cursor_c = COL8_000000;
                } else {
                    timer_init(timer, &fifo, 1); /* 次は1を */
                    cursor_c = COL8_FFFFFF;
                }
                timer_settime(timer, 50);
                boxfill8(sht_win->buf, sht_win->bxsize, cursor_c, cursor_x, 28, cursor_x + 7, 43);
                sheet_refresh(sht_win, cursor_x, 28, cursor_x + 8, 44);
            }
        }
    }
}

void make_window8(unsigned char *buf, int xsize, int ysize, char *title, char act)
{
    boxfill8(buf, xsize, COL8_C6C6C6, 0,         0,         xsize - 1, 0        );
    boxfill8(buf, xsize, COL8_FFFFFF, 1,         1,         xsize - 2, 1        );
    boxfill8(buf, xsize, COL8_C6C6C6, 0,         0,         0,         ysize - 1);
    boxfill8(buf, xsize, COL8_FFFFFF, 1,         1,         1,         ysize - 2);
    boxfill8(buf, xsize, COL8_848484, xsize - 2, 1,         xsize - 2, ysize - 2);
    boxfill8(buf, xsize, COL8_000000, xsize - 1, 0,         xsize - 1, ysize - 1);
    boxfill8(buf, xsize, COL8_C6C6C6, 2,         2,         xsize - 3, ysize - 3);
    boxfill8(buf, xsize, COL8_848484, 1,         ysize - 2, xsize - 2, ysize - 2);
    boxfill8(buf, xsize, COL8_000000, 0,         ysize - 1, xsize - 1, ysize - 1);
    make_wtitle8(buf, xsize, title, act);
    return;
}

void make_wtitle8(unsigned char *buf, int xsize, char *title, char act)
{
    static char closebtn[14][16] = {
        "OOOOOOOOOOOOOOO@",
        "OQQQQQQQQQQQQQ$@",
        "OQQQQQQQQQQQQQ$@",
        "OQQQ@@QQQQ@@QQ$@",
        "OQQQQ@@QQ@@QQQ$@",
        "OQQQQQ@@@@QQQQ$@",
        "OQQQQQQ@@QQQQQ$@",
        "OQQQQQ@@@@QQQQ$@",
        "OQQQQ@@QQ@@QQQ$@",
        "OQQQ@@QQQQ@@QQ$@",
        "OQQQQQQQQQQQQQ$@",
        "OQQQQQQQQQQQQQ$@",
        "O$$$$$$$$$$$$$$@",
        "@@@@@@@@@@@@@@@@"
    };
    int x, y;
    char c, tc, tbc;
    if (act != 0) {
        tc = COL8_FFFFFF;
        tbc = COL8_000084;
    } else {
        tc = COL8_C6C6C6;
        tbc = COL8_848484;
    }
    boxfill8(buf, xsize, tbc, 3, 3, xsize - 4, 20);
    putfonts8_asc(buf, xsize, 24, 4, tc, title);
    for (y = 0; y < 14; y++) {
        for (x = 0; x < 16; x++) {
            c = closebtn[y][x];
            if (c == '@') {
                c = COL8_000000;
            } else if (c == '$') {
                c = COL8_848484;
            } else if (c == 'Q') {
                c = COL8_C6C6C6;
            } else {
                c = COL8_FFFFFF;
            }
            buf[(5 + y) * xsize + (xsize - 21 + x)] = c;
        }
    }
    return;
}

void putfonts8_asc_sht(struct SHEET *sht, int x, int y, int c, int b, char *s, int l)
{
    boxfill8(sht->buf, sht->bxsize, b, x, y, x + l * 8 - 1, y + 15);
    putfonts8_asc(sht->buf, sht->bxsize, x, y, c, s);
    sheet_refresh(sht, x, y, x + l * 8, y + 16);
    return;
}

void make_textbox8(struct SHEET *sht, int x0, int y0, int sx, int sy, int c)
{
    int x1 = x0 + sx, y1 = y0 + sy;
    boxfill8(sht->buf, sht->bxsize, COL8_848484, x0 - 2, y0 - 3, x1 + 1, y0 - 3);
    boxfill8(sht->buf, sht->bxsize, COL8_848484, x0 - 3, y0 - 3, x0 - 3, y1 + 1);
    boxfill8(sht->buf, sht->bxsize, COL8_FFFFFF, x0 - 3, y1 + 2, x1 + 1, y1 + 2);
    boxfill8(sht->buf, sht->bxsize, COL8_FFFFFF, x1 + 2, y0 - 3, x1 + 2, y1 + 2);
    boxfill8(sht->buf, sht->bxsize, COL8_000000, x0 - 1, y0 - 2, x1 + 0, y0 - 2);
    boxfill8(sht->buf, sht->bxsize, COL8_000000, x0 - 2, y0 - 2, x0 - 2, y1 + 0);
    boxfill8(sht->buf, sht->bxsize, COL8_C6C6C6, x0 - 2, y1 + 1, x1 + 0, y1 + 1);
    boxfill8(sht->buf, sht->bxsize, COL8_C6C6C6, x1 + 1, y0 - 2, x1 + 1, y1 + 1);
    boxfill8(sht->buf, sht->bxsize, c,           x0 - 1, y0 - 1, x1 + 0, y1 + 0);
    return;
}

void console_task(struct SHEET *sheet)
{
    struct FIFO32 fifo;
    struct TIMER *timer;
    struct TASK *task = task_now();

    int i, fifobuf[128], cursor_x = 8, cursor_c = COL8_000000;
    fifo32_init(&fifo, 128, fifobuf, task);

    timer = timer_alloc();
    timer_init(timer, &fifo, 1);
    timer_settime(timer, 50);

    for (;;) {
        io_cli();
        if (fifo32_status(&fifo) == 0) {
            task_sleep(task);
            io_sti();
        } else {
            i = fifo32_get(&fifo);
            io_sti();
            if (i <= 1) { /* カーソル用タイマ */
                if (i != 0) {
                    timer_init(timer, &fifo, 0); /* 次は0を */
                    cursor_c = COL8_FFFFFF;
                } else {
                    timer_init(timer, &fifo, 1); /* 次は1を */
                    cursor_c = COL8_000000;
                }
                timer_settime(timer, 50);
                boxfill8(sheet->buf, sheet->bxsize, cursor_c, cursor_x, 28, cursor_x + 7, 43);
                sheet_refresh(sheet, cursor_x, 28, cursor_x + 8, 44);
            }
        }
    }
}

コンソール画面に文字を打てるようにします。
bootpack.h

struct TASK {
    int sel, flags; /* selはGDTの番号のこと */
    int level, priority;
    struct FIFO32 fifo;
    struct TSS32 tss;
};

bootpack.c

for (;;) {
        io_cli();
        if (fifo32_status(&fifo) == 0) {
            task_sleep(task_a);
            io_sti();
        } else {
            i = fifo32_get(&fifo);
            io_sti();
            if (256 <= i && i <= 511) { /* キーボードデータ */
                sprintf(s, "%02X", i - 256);
                putfonts8_asc_sht(sht_back, 0, 16, COL8_FFFFFF, COL8_008484, s, 2);
                if (i < 0x54 + 256 && keytable[i - 256] != 0) { /* 通常文字 */
                    if (key_to == 0) {   /* タスクAへ */
                        if (cursor_x < 128) {
                            /* 一文字表示してから、カーソルを1つ進める */
                            s[0] = keytable[i - 256];
                            s[1] = 0;
                            putfonts8_asc_sht(sht_win, cursor_x, 28, COL8_000000, COL8_FFFFFF, s, 1);
                            cursor_x += 8;
                        }
                    } else {  /* コンソールへ */
                        fifo32_put(&task_cons->fifo, keytable[i - 256] + 256);
                    }
                }
                if (i == 256 + 0x0e) {  /* バックスペース */
                    if (key_to == 0) {   /* タスクAへ */
                        if (cursor_x > 8) {
                            /* カーソルをスペースで消してから、カーソルを1つ戻す */
                            putfonts8_asc_sht(sht_win, cursor_x, 28, COL8_000000, COL8_FFFFFF, " ", 1);
                            cursor_x -= 8;
                        }
                    } else {  /* コンソールへ */
                        fifo32_put(&task_cons->fifo, 8 + 256);
                    }
                }
                if (i == 256 + 0x0f) { /* Tab */
                    if (key_to == 0) {
                        key_to = 1;
                        make_wtitle8(buf_win,  sht_win->bxsize,  "task_a",  0);
                        make_wtitle8(buf_cons, sht_cons->bxsize, "console", 1);
                    } else {
                        key_to = 0;
                        make_wtitle8(buf_win,  sht_win->bxsize,  "task_a",  1);
                        make_wtitle8(buf_cons, sht_cons->bxsize, "console", 0);
                    }
                    sheet_refresh(sht_win,  0, 0, sht_win->bxsize,  21);
                    sheet_refresh(sht_cons, 0, 0, sht_cons->bxsize, 21);
                }
void console_task(struct SHEET *sheet)
{
    struct TIMER *timer;
    struct TASK *task = task_now();
    int i, fifobuf[128], cursor_x = 16, cursor_c = COL8_000000;
    char s[2];

    fifo32_init(&task->fifo, 128, fifobuf, task);
    timer = timer_alloc();
    timer_init(timer, &task->fifo, 1);
    timer_settime(timer, 50);
     
     /* プロンプト表示 */
     putfonts8_asc_sht(sheet, 8, 28, COL8_FFFFFF, COL8_000000, ">", 1);

    for (;;) {
        io_cli();
        if (fifo32_status(&task->fifo) == 0) {
            task_sleep(task);
            io_sti();
        } else {
            i = fifo32_get(&task->fifo);
            io_sti();
            if (i <= 1) { /* カーソル用タイマ */
                if (i != 0) {
                    timer_init(timer, &task->fifo, 0); /* 次は0を */
                    cursor_c = COL8_FFFFFF;
                } else {
                    timer_init(timer, &task->fifo, 1); /* 次は1を */
                    cursor_c = COL8_000000;
                }
                timer_settime(timer, 50);
            }
            if (256 <= i && i <= 511) { /* キーボードデータ(タスクA経由) */
                if (i == 8 + 256) {
                    /* バックスペース */
                    if (cursor_x > 16) {
                        /* カーソルをスペースで消してから、カーソルを1つ戻す */
                        putfonts8_asc_sht(sheet, cursor_x, 28, COL8_FFFFFF, COL8_000000, " ", 1);
                        cursor_x -= 8;
                    }
                } else {
                    /* 一般文字 */
                    if (cursor_x < 240) {
                        /* 一文字表示してから、カーソルを1つ進める */
                        s[0] = i - 256;
                        s[1] = 0;
                        putfonts8_asc_sht(sheet, cursor_x, 28, COL8_FFFFFF, COL8_000000, s, 1);
                        cursor_x += 8;
                    } 
                }
            }
            /* カーソル再表示 */
            boxfill8(sheet->buf, sheet->bxsize, cursor_c, cursor_x, 28, cursor_x + 7, 43);
            sheet_refresh(sheet, cursor_x, 28, cursor_x + 8, 44);
        }
    }
}

記号入力を出来るようにしたいと思います。
bootpack.c

void HariMain(void)
{
    struct BOOTINFO *binfo = (struct BOOTINFO *) ADR_BOOTINFO;
    struct FIFO32 fifo;
    struct SHTCTL *shtctl;
    char s[40];
    int fifobuf[128];
    int mx, my, i, cursor_x, cursor_c;
    unsigned int memtotal;
    struct MOUSE_DEC mdec;
    struct MEMMAN *memman = (struct MEMMAN *) MEMMAN_ADDR;
    unsigned char *buf_back, buf_mouse[256], *buf_win, *buf_cons;
    struct SHEET *sht_back, *sht_mouse, *sht_win, *sht_cons;
    struct TASK *task_a, *task_cons;
    struct TIMER *timer;
    static char keytable0[0x80] = {
        0,   0,   '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '-', '^', 0,   0,
        'Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'I', 'O', 'P', '@', '[', 0,   0,   'A', 'S',
        'D', 'F', 'G', 'H', 'J', 'K', 'L', ';', ':', 0,   0,   ']', 'Z', 'X', 'C', 'V',
        'B', 'N', 'M', ',', '.', '/', 0,   '*', 0,   ' ', 0,   0,   0,   0,   0,   0,
        0,   0,   0,   0,   0,   0,   0,   '7', '8', '9', '-', '4', '5', '6', '+', '1',
        '2', '3', '0', '.', 0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
        0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
        0,   0,   0,   0x5c, 0,  0,   0,   0,   0,   0,   0,   0,   0,   0x5c, 0,  0
    };
    static char keytable1[0x80] = {
        0,   0,   '!', 0x22, '#', '$', '%', '&', 0x27, '(', ')', '~', '=', '~', 0,   0,
        'Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'I', 'O', 'P', '`', '{', 0,   0,   'A', 'S',
        'D', 'F', 'G', 'H', 'J', 'K', 'L', '+', '*', 0,   0,   '}', 'Z', 'X', 'C', 'V',
        'B', 'N', 'M', '<', '>', '?', 0,   '*', 0,   ' ', 0,   0,   0,   0,   0,   0,
        0,   0,   0,   0,   0,   0,   0,   '7', '8', '9', '-', '4', '5', '6', '+', '1',
        '2', '3', '0', '.', 0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
        0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
        0,   0,   0,   '_', 0,   0,   0,   0,   0,   0,   0,   0,   0,   '|', 0,   0
    };
    int key_to = 0, key_shift = 0;

    init_gdtidt();
    init_pic();
    io_sti(); /* IDT/PICの初期化が終わったのでCPUの割り込み禁止を解除 */
    fifo32_init(&fifo, 128, fifobuf, 0);
    init_pit();
    init_keyboard(&fifo, 256);
    enable_mouse(&fifo, 512, &mdec);
    io_out8(PIC0_IMR, 0xf8); /* PITとPIC1とキーボードを許可(11111000) */
    io_out8(PIC1_IMR, 0xef); /* マウスを許可(11101111) */

    memtotal = memtest(0x00400000, 0xbfffffff);
    memman_init(memman);
    memman_free(memman, 0x00001000, 0x0009e000); /* 0x00001000 - 0x0009efff */
    memman_free(memman, 0x00400000, memtotal - 0x00400000);

    init_palette();
    shtctl = shtctl_init(memman, binfo->vram, binfo->scrnx, binfo->scrny);
    task_a = task_init(memman);
    fifo.task = task_a;
    task_run(task_a, 1, 2);

    /* sht_back */
    sht_back  = sheet_alloc(shtctl);
    buf_back  = (unsigned char *) memman_alloc_4k(memman, binfo->scrnx * binfo->scrny);
    sheet_setbuf(sht_back, buf_back, binfo->scrnx, binfo->scrny, -1); /* 透明色なし */
    init_screen8(buf_back, binfo->scrnx, binfo->scrny);

    /* sht_cons */
    sht_cons = sheet_alloc(shtctl);
    buf_cons = (unsigned char *) memman_alloc_4k(memman, 256 * 165);
    sheet_setbuf(sht_cons, buf_cons, 256, 165, -1); /* 透明色なし */
    make_window8(buf_cons, 256, 165, "console", 0);
    make_textbox8(sht_cons, 8, 28, 240, 128, COL8_000000);
    task_cons = task_alloc();
    task_cons->tss.esp = memman_alloc_4k(memman, 64 * 1024) + 64 * 1024 - 8;
    task_cons->tss.eip = (int) &console_task;
    task_cons->tss.es = 1 * 8;
    task_cons->tss.cs = 2 * 8;
    task_cons->tss.ss = 1 * 8;
    task_cons->tss.ds = 1 * 8;
    task_cons->tss.fs = 1 * 8;
    task_cons->tss.gs = 1 * 8;
    *((int *) (task_cons->tss.esp + 4)) = (int) sht_cons;
    task_run(task_cons, 2, 2); /* level=2, priority=2 */

    /* sht_win */
    sht_win   = sheet_alloc(shtctl);
    buf_win   = (unsigned char *) memman_alloc_4k(memman, 160 * 52);
    sheet_setbuf(sht_win, buf_win, 144, 52, -1); /* 透明色なし */
    make_window8(buf_win, 144, 52, "task_a", 1);
    make_textbox8(sht_win, 8, 28, 128, 16, COL8_FFFFFF);
    cursor_x = 8;
    cursor_c = COL8_FFFFFF;
    timer = timer_alloc();
    timer_init(timer, &fifo, 1);
    timer_settime(timer, 50);

    /* sht_mouse */
    sht_mouse = sheet_alloc(shtctl);
    sheet_setbuf(sht_mouse, buf_mouse, 16, 16, 99);
    init_mouse_cursor8(buf_mouse, 99);
    mx = (binfo->scrnx - 16) / 2; /* 画面中央になるように座標計算 */
    my = (binfo->scrny - 28 - 16) / 2;

    sheet_slide(sht_back,  0,  0);
    sheet_slide(sht_cons, 32,  4);
    sheet_slide(sht_win,  64, 56);
    sheet_slide(sht_mouse, mx, my);
    sheet_updown(sht_back,  0);
    sheet_updown(sht_cons,  1);
    sheet_updown(sht_win,   2);
    sheet_updown(sht_mouse, 3);
    sprintf(s, "(%3d, %3d)", mx, my);
    putfonts8_asc_sht(sht_back, 0, 0, COL8_FFFFFF, COL8_008484, s, 10);
    sprintf(s, "memory %dMB   free : %dKB",
            memtotal / (1024 * 1024), memman_total(memman) / 1024);
    putfonts8_asc_sht(sht_back, 0, 32, COL8_FFFFFF, COL8_008484, s, 40);

    for (;;) {
        io_cli();
        if (fifo32_status(&fifo) == 0) {
            task_sleep(task_a);
            io_sti();
        } else {
            i = fifo32_get(&fifo);
            io_sti();
            if (256 <= i && i <= 511) { /* キーボードデータ */
                sprintf(s, "%02X", i - 256);
                putfonts8_asc_sht(sht_back, 0, 16, COL8_FFFFFF, COL8_008484, s, 2);
                if (i < 0x80 + 256) { /* キーコードを文字コードに変換 */
                    if (key_shift == 0) {
                        s[0] = keytable0[i - 256];
                    } else {
                        s[0] = keytable1[i - 256];
                    }
                } else {
                    s[0] = 0;
                }
                if (s[0] != 0) { /* 通常文字 */
                    if (key_to == 0) {   /* タスクAへ */
                        if (cursor_x < 128) {
                            /* 一文字表示してから、カーソルを1つ進める */
                            s[1] = 0;
                            putfonts8_asc_sht(sht_win, cursor_x, 28, COL8_000000, COL8_FFFFFF, s, 1);
                            cursor_x += 8;
                        }
                    } else {  /* コンソールへ */
                        fifo32_put(&task_cons->fifo, s[0] + 256);
                    }
                }
                if (i == 256 + 0x0e) {  /* バックスペース */
                    if (key_to == 0) {   /* タスクAへ */
                        if (cursor_x > 8) {
                            /* カーソルをスペースで消してから、カーソルを1つ戻す */
                            putfonts8_asc_sht(sht_win, cursor_x, 28, COL8_000000, COL8_FFFFFF, " ", 1);
                            cursor_x -= 8;
                        }
                    } else {  /* コンソールへ */
                        fifo32_put(&task_cons->fifo, 8 + 256);
                    }
                }
                if (i == 256 + 0x0f) {  /* Tab */
                    if (key_to == 0) {
                        key_to = 1;
                        make_wtitle8(buf_win,  sht_win->bxsize,  "task_a",  0);
                        make_wtitle8(buf_cons, sht_cons->bxsize, "console", 1);
                    } else {
                        key_to = 0;
                        make_wtitle8(buf_win,  sht_win->bxsize,  "task_a",  1);
                        make_wtitle8(buf_cons, sht_cons->bxsize, "console", 0);
                    }
                    sheet_refresh(sht_win,  0, 0, sht_win->bxsize,  21);
                    sheet_refresh(sht_cons, 0, 0, sht_cons->bxsize, 21);
                }
                if (i == 256 + 0x2a) {  /* 左シフト ON */
                    key_shift |= 1;
                }
                if (i == 256 + 0x36) {  /* 右シフト ON */
                    key_shift |= 2;
                }
                if (i == 256 + 0xaa) {  /* 左シフト OFF */
                    key_shift &= ~1;
                }
                if (i == 256 + 0xb6) {  /* 右シフト OFF */
                    key_shift &= ~2;
                }
                /* カーソルの再表示 */
                boxfill8(sht_win->buf, sht_win->bxsize, cursor_c, cursor_x, 28, cursor_x + 7, 43);
                sheet_refresh(sht_win, cursor_x, 28, cursor_x + 8, 44);
            } else if (512 <= i && i <= 767) { /* マウスデータ */
                if (mouse_decode(&mdec, i - 512) != 0) {
                    /* データが3バイト揃ったので表示 */
                    sprintf(s, "[lcr %4d %4d]", mdec.x, mdec.y);
                    if ((mdec.btn & 0x01) != 0) {
                        s[1] = 'L';
                    }
                    if ((mdec.btn & 0x02) != 0) {
                        s[3] = 'R';
                    }
                    if ((mdec.btn & 0x04) != 0) {
                        s[2] = 'C';
                    }
                    putfonts8_asc_sht(sht_back, 32, 16, COL8_FFFFFF, COL8_008484, s, 15);
                    /* マウスカーソルの移動 */
                    mx += mdec.x;
                    my += mdec.y;
                    if (mx < 0) {
                        mx = 0;
                    }
                    if (my < 0) {
                        my = 0;
                    }
                    if (mx > binfo->scrnx - 1) {
                        mx = binfo->scrnx - 1;
                    }
                    if (my > binfo->scrny - 1) {
                        my = binfo->scrny - 1;
                    }
                    sprintf(s, "(%3d, %3d)", mx, my);
                    putfonts8_asc_sht(sht_back, 0, 0, COL8_FFFFFF, COL8_008484, s, 10);
                    sheet_slide(sht_mouse, mx, my);
                    if ((mdec.btn & 0x01) != 0) {
                        /* 左ボタンを押していたら、sht_winを動かす */
                        sheet_slide(sht_win, mx - 80, my - 8);
                    }
                }
            } else if (i <= 1) { /* カーソル用タイマ */
                if (i != 0) {
                    timer_init(timer, &fifo, 0); /* 次は0を */
                    cursor_c = COL8_000000;
                } else {
                    timer_init(timer, &fifo, 1); /* 次は1を */
                    cursor_c = COL8_FFFFFF;
                }
                timer_settime(timer, 50);
                boxfill8(sht_win->buf, sht_win->bxsize, cursor_c, cursor_x, 28, cursor_x + 7, 43);
                sheet_refresh(sht_win, cursor_x, 28, cursor_x + 8, 44);
            }
        }
    }
}

大文字小文字を切り替えられるようにします。
bootpack.c

void HariMain(void)
{
    struct BOOTINFO *binfo = (struct BOOTINFO *) ADR_BOOTINFO;
    struct FIFO32 fifo;
    struct SHTCTL *shtctl;
    char s[40];
    int fifobuf[128];
    int mx, my, i, cursor_x, cursor_c;
    unsigned int memtotal;
    struct MOUSE_DEC mdec;
    struct MEMMAN *memman = (struct MEMMAN *) MEMMAN_ADDR;
    unsigned char *buf_back, buf_mouse[256], *buf_win, *buf_cons;
    struct SHEET *sht_back, *sht_mouse, *sht_win, *sht_cons;
    struct TASK *task_a, *task_cons;
    struct TIMER *timer;
    static char keytable0[0x80] = {
        0,   0,   '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '-', '^', 0,   0,
        'Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'I', 'O', 'P', '@', '[', 0,   0,   'A', 'S',
        'D', 'F', 'G', 'H', 'J', 'K', 'L', ';', ':', 0,   0,   ']', 'Z', 'X', 'C', 'V',
        'B', 'N', 'M', ',', '.', '/', 0,   '*', 0,   ' ', 0,   0,   0,   0,   0,   0,
        0,   0,   0,   0,   0,   0,   0,   '7', '8', '9', '-', '4', '5', '6', '+', '1',
        '2', '3', '0', '.', 0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
        0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
        0,   0,   0,   0x5c, 0,  0,   0,   0,   0,   0,   0,   0,   0,   0x5c, 0,  0
    };
    static char keytable1[0x80] = {
        0,   0,   '!', 0x22, '#', '$', '%', '&', 0x27, '(', ')', '~', '=', '~', 0,   0,
        'Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'I', 'O', 'P', '`', '{', 0,   0,   'A', 'S',
        'D', 'F', 'G', 'H', 'J', 'K', 'L', '+', '*', 0,   0,   '}', 'Z', 'X', 'C', 'V',
        'B', 'N', 'M', '<', '>', '?', 0,   '*', 0,   ' ', 0,   0,   0,   0,   0,   0,
        0,   0,   0,   0,   0,   0,   0,   '7', '8', '9', '-', '4', '5', '6', '+', '1',
        '2', '3', '0', '.', 0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
        0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
        0,   0,   0,   '_', 0,   0,   0,   0,   0,   0,   0,   0,   0,   '|', 0,   0
    };
    int key_to = 0, key_shift = 0, key_leds = (binfo->leds >> 4) & 7;

    init_gdtidt();
    init_pic();
    io_sti(); /* IDT/PICの初期化が終わったのでCPUの割り込み禁止を解除 */
    fifo32_init(&fifo, 128, fifobuf, 0);
    init_pit();
    init_keyboard(&fifo, 256);
    enable_mouse(&fifo, 512, &mdec);
    io_out8(PIC0_IMR, 0xf8); /* PITとPIC1とキーボードを許可(11111000) */
    io_out8(PIC1_IMR, 0xef); /* マウスを許可(11101111) */

    memtotal = memtest(0x00400000, 0xbfffffff);
    memman_init(memman);
    memman_free(memman, 0x00001000, 0x0009e000); /* 0x00001000 - 0x0009efff */
    memman_free(memman, 0x00400000, memtotal - 0x00400000);

    init_palette();
    shtctl = shtctl_init(memman, binfo->vram, binfo->scrnx, binfo->scrny);
    task_a = task_init(memman);
    fifo.task = task_a;
    task_run(task_a, 1, 2);

    /* sht_back */
    sht_back  = sheet_alloc(shtctl);
    buf_back  = (unsigned char *) memman_alloc_4k(memman, binfo->scrnx * binfo->scrny);
    sheet_setbuf(sht_back, buf_back, binfo->scrnx, binfo->scrny, -1); /* 透明色なし */
    init_screen8(buf_back, binfo->scrnx, binfo->scrny);

    /* sht_cons */
    sht_cons = sheet_alloc(shtctl);
    buf_cons = (unsigned char *) memman_alloc_4k(memman, 256 * 165);
    sheet_setbuf(sht_cons, buf_cons, 256, 165, -1); /* 透明色なし */
    make_window8(buf_cons, 256, 165, "console", 0);
    make_textbox8(sht_cons, 8, 28, 240, 128, COL8_000000);
    task_cons = task_alloc();
    task_cons->tss.esp = memman_alloc_4k(memman, 64 * 1024) + 64 * 1024 - 8;
    task_cons->tss.eip = (int) &console_task;
    task_cons->tss.es = 1 * 8;
    task_cons->tss.cs = 2 * 8;
    task_cons->tss.ss = 1 * 8;
    task_cons->tss.ds = 1 * 8;
    task_cons->tss.fs = 1 * 8;
    task_cons->tss.gs = 1 * 8;
    *((int *) (task_cons->tss.esp + 4)) = (int) sht_cons;
    task_run(task_cons, 2, 2); /* level=2, priority=2 */

    /* sht_win */
    sht_win   = sheet_alloc(shtctl);
    buf_win   = (unsigned char *) memman_alloc_4k(memman, 160 * 52);
    sheet_setbuf(sht_win, buf_win, 144, 52, -1); /* 透明色なし */
    make_window8(buf_win, 144, 52, "task_a", 1);
    make_textbox8(sht_win, 8, 28, 128, 16, COL8_FFFFFF);
    cursor_x = 8;
    cursor_c = COL8_FFFFFF;
    timer = timer_alloc();
    timer_init(timer, &fifo, 1);
    timer_settime(timer, 50);

    /* sht_mouse */
    sht_mouse = sheet_alloc(shtctl);
    sheet_setbuf(sht_mouse, buf_mouse, 16, 16, 99);
    init_mouse_cursor8(buf_mouse, 99);
    mx = (binfo->scrnx - 16) / 2; /* 画面中央になるように座標計算 */
    my = (binfo->scrny - 28 - 16) / 2;

    sheet_slide(sht_back,  0,  0);
    sheet_slide(sht_cons, 32,  4);
    sheet_slide(sht_win,  64, 56);
    sheet_slide(sht_mouse, mx, my);
    sheet_updown(sht_back,  0);
    sheet_updown(sht_cons,  1);
    sheet_updown(sht_win,   2);
    sheet_updown(sht_mouse, 3);
    sprintf(s, "(%3d, %3d)", mx, my);
    putfonts8_asc_sht(sht_back, 0, 0, COL8_FFFFFF, COL8_008484, s, 10);
    sprintf(s, "memory %dMB   free : %dKB",
            memtotal / (1024 * 1024), memman_total(memman) / 1024);
    putfonts8_asc_sht(sht_back, 0, 32, COL8_FFFFFF, COL8_008484, s, 40);

    for (;;) {
        io_cli();
        if (fifo32_status(&fifo) == 0) {
            task_sleep(task_a);
            io_sti();
        } else {
            i = fifo32_get(&fifo);
            io_sti();
            if (256 <= i && i <= 511) { /* キーボードデータ */
                sprintf(s, "%02X", i - 256);
                putfonts8_asc_sht(sht_back, 0, 16, COL8_FFFFFF, COL8_008484, s, 2);
                if (i < 0x80 + 256) { /* キーコードを文字コードに変換 */
                    if (key_shift == 0) {
                        s[0] = keytable0[i - 256];
                    } else {
                        s[0] = keytable1[i - 256];
                    }
                } else {
                    s[0] = 0;
                }
                if ('A' <= s[0] && s[0] <= 'Z') {   /* 入力文字がアルファベット */
                    if (((key_leds & 4) == 0 && key_shift == 0) ||
                        ((key_leds & 4) != 0 && key_shift != 0)) {
                            s[0] += 0x20; /* 大文字を小文字に変換 */
                        }
                }
                if (s[0] != 0) { /* 通常文字 */
                    if (key_to == 0) {   /* タスクAへ */
                        if (cursor_x < 128) {
                            /* 一文字表示してから、カーソルを1つ進める */
                            s[1] = 0;
                            putfonts8_asc_sht(sht_win, cursor_x, 28, COL8_000000, COL8_FFFFFF, s, 1);
                            cursor_x += 8;
                        }
                    } else {  /* コンソールへ */
                        fifo32_put(&task_cons->fifo, s[0] + 256);
                    }
                }
                if (i == 256 + 0x0e) {  /* バックスペース */
                    if (key_to == 0) {   /* タスクAへ */
                        if (cursor_x > 8) {
                            /* カーソルをスペースで消してから、カーソルを1つ戻す */
                            putfonts8_asc_sht(sht_win, cursor_x, 28, COL8_000000, COL8_FFFFFF, " ", 1);
                            cursor_x -= 8;
                        }
                    } else {  /* コンソールへ */
                        fifo32_put(&task_cons->fifo, 8 + 256);
                    }
                }
                if (i == 256 + 0x0f) {  /* Tab */
                    if (key_to == 0) {
                        key_to = 1;
                        make_wtitle8(buf_win,  sht_win->bxsize,  "task_a",  0);
                        make_wtitle8(buf_cons, sht_cons->bxsize, "console", 1);
                    } else {
                        key_to = 0;
                        make_wtitle8(buf_win,  sht_win->bxsize,  "task_a",  1);
                        make_wtitle8(buf_cons, sht_cons->bxsize, "console", 0);
                    }
                    sheet_refresh(sht_win,  0, 0, sht_win->bxsize,  21);
                    sheet_refresh(sht_cons, 0, 0, sht_cons->bxsize, 21);
                }
                if (i == 256 + 0x2a) {  /* 左シフト ON */
                    key_shift |= 1;
                }
                if (i == 256 + 0x36) {  /* 右シフト ON */
                    key_shift |= 2;
                }
                if (i == 256 + 0xaa) {  /* 左シフト OFF */
                    key_shift &= ~1;
                }
                if (i == 256 + 0xb6) {  /* 右シフト OFF */
                    key_shift &= ~2;
                }
                /* カーソルの再表示 */
                boxfill8(sht_win->buf, sht_win->bxsize, cursor_c, cursor_x, 28, cursor_x + 7, 43);
                sheet_refresh(sht_win, cursor_x, 28, cursor_x + 8, 44);
            } else if (512 <= i && i <= 767) { /* マウスデータ */
                if (mouse_decode(&mdec, i - 512) != 0) {
                    /* データが3バイト揃ったので表示 */
                    sprintf(s, "[lcr %4d %4d]", mdec.x, mdec.y);
                    if ((mdec.btn & 0x01) != 0) {
                        s[1] = 'L';
                    }
                    if ((mdec.btn & 0x02) != 0) {
                        s[3] = 'R';
                    }
                    if ((mdec.btn & 0x04) != 0) {
                        s[2] = 'C';
                    }
                    putfonts8_asc_sht(sht_back, 32, 16, COL8_FFFFFF, COL8_008484, s, 15);
                    /* マウスカーソルの移動 */
                    mx += mdec.x;
                    my += mdec.y;
                    if (mx < 0) {
                        mx = 0;
                    }
                    if (my < 0) {
                        my = 0;
                    }
                    if (mx > binfo->scrnx - 1) {
                        mx = binfo->scrnx - 1;
                    }
                    if (my > binfo->scrny - 1) {
                        my = binfo->scrny - 1;
                    }
                    sprintf(s, "(%3d, %3d)", mx, my);
                    putfonts8_asc_sht(sht_back, 0, 0, COL8_FFFFFF, COL8_008484, s, 10);
                    sheet_slide(sht_mouse, mx, my);
                    if ((mdec.btn & 0x01) != 0) {
                        /* 左ボタンを押していたら、sht_winを動かす */
                        sheet_slide(sht_win, mx - 80, my - 8);
                    }
                }
            } else if (i <= 1) { /* カーソル用タイマ */
                if (i != 0) {
                    timer_init(timer, &fifo, 0); /* 次は0を */
                    cursor_c = COL8_000000;
                } else {
                    timer_init(timer, &fifo, 1); /* 次は1を */
                    cursor_c = COL8_FFFFFF;
                }
                timer_settime(timer, 50);
                boxfill8(sht_win->buf, sht_win->bxsize, cursor_c, cursor_x, 28, cursor_x + 7, 43);
                sheet_refresh(sht_win, cursor_x, 28, cursor_x + 8, 44);
            }
        }
    }
}

Lockキーに対応するようにします。
bootpack.c

#define KEYCMD_LED      0xed

void HariMain(void)
{
    struct BOOTINFO *binfo = (struct BOOTINFO *) ADR_BOOTINFO;
    struct SHTCTL *shtctl;
    char s[40];
    struct FIFO32 fifo, keycmd;
    int fifobuf[128], keycmd_buf[32];
    int mx, my, i, cursor_x, cursor_c;
    unsigned int memtotal;
    struct MOUSE_DEC mdec;
    struct MEMMAN *memman = (struct MEMMAN *) MEMMAN_ADDR;
    unsigned char *buf_back, buf_mouse[256], *buf_win, *buf_cons;
    struct SHEET *sht_back, *sht_mouse, *sht_win, *sht_cons;
    struct TASK *task_a, *task_cons;
    struct TIMER *timer;
    static char keytable0[0x80] = {
        0,   0,   '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '-', '^', 0,   0,
        'Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'I', 'O', 'P', '@', '[', 0,   0,   'A', 'S',
        'D', 'F', 'G', 'H', 'J', 'K', 'L', ';', ':', 0,   0,   ']', 'Z', 'X', 'C', 'V',
        'B', 'N', 'M', ',', '.', '/', 0,   '*', 0,   ' ', 0,   0,   0,   0,   0,   0,
        0,   0,   0,   0,   0,   0,   0,   '7', '8', '9', '-', '4', '5', '6', '+', '1',
        '2', '3', '0', '.', 0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
        0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
        0,   0,   0,   0x5c, 0,  0,   0,   0,   0,   0,   0,   0,   0,   0x5c, 0,  0
    };
    static char keytable1[0x80] = {
        0,   0,   '!', 0x22, '#', '$', '%', '&', 0x27, '(', ')', '~', '=', '~', 0,   0,
        'Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'I', 'O', 'P', '`', '{', 0,   0,   'A', 'S',
        'D', 'F', 'G', 'H', 'J', 'K', 'L', '+', '*', 0,   0,   '}', 'Z', 'X', 'C', 'V',
        'B', 'N', 'M', '<', '>', '?', 0,   '*', 0,   ' ', 0,   0,   0,   0,   0,   0,
        0,   0,   0,   0,   0,   0,   0,   '7', '8', '9', '-', '4', '5', '6', '+', '1',
        '2', '3', '0', '.', 0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
        0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
        0,   0,   0,   '_', 0,   0,   0,   0,   0,   0,   0,   0,   0,   '|', 0,   0
    };
    int key_to = 0, key_shift = 0, key_leds = (binfo->leds >> 4) & 7, keycmd_wait = -1;

    init_gdtidt();
    init_pic();
    io_sti(); /* IDT/PICの初期化が終わったのでCPUの割り込み禁止を解除 */
    fifo32_init(&fifo, 128, fifobuf, 0);
    init_pit();
    init_keyboard(&fifo, 256);
    enable_mouse(&fifo, 512, &mdec);
    io_out8(PIC0_IMR, 0xf8); /* PITとPIC1とキーボードを許可(11111000) */
    io_out8(PIC1_IMR, 0xef); /* マウスを許可(11101111) */
    fifo32_init(&keycmd, 32, keycmd_buf, 0);

    memtotal = memtest(0x00400000, 0xbfffffff);
    memman_init(memman);
    memman_free(memman, 0x00001000, 0x0009e000); /* 0x00001000 - 0x0009efff */
    memman_free(memman, 0x00400000, memtotal - 0x00400000);

    init_palette();
    shtctl = shtctl_init(memman, binfo->vram, binfo->scrnx, binfo->scrny);
    task_a = task_init(memman);
    fifo.task = task_a;
    task_run(task_a, 1, 2);

    /* sht_back */
    sht_back  = sheet_alloc(shtctl);
    buf_back  = (unsigned char *) memman_alloc_4k(memman, binfo->scrnx * binfo->scrny);
    sheet_setbuf(sht_back, buf_back, binfo->scrnx, binfo->scrny, -1); /* 透明色なし */
    init_screen8(buf_back, binfo->scrnx, binfo->scrny);

    /* sht_cons */
    sht_cons = sheet_alloc(shtctl);
    buf_cons = (unsigned char *) memman_alloc_4k(memman, 256 * 165);
    sheet_setbuf(sht_cons, buf_cons, 256, 165, -1); /* 透明色なし */
    make_window8(buf_cons, 256, 165, "console", 0);
    make_textbox8(sht_cons, 8, 28, 240, 128, COL8_000000);
    task_cons = task_alloc();
    task_cons->tss.esp = memman_alloc_4k(memman, 64 * 1024) + 64 * 1024 - 8;
    task_cons->tss.eip = (int) &console_task;
    task_cons->tss.es = 1 * 8;
    task_cons->tss.cs = 2 * 8;
    task_cons->tss.ss = 1 * 8;
    task_cons->tss.ds = 1 * 8;
    task_cons->tss.fs = 1 * 8;
    task_cons->tss.gs = 1 * 8;
    *((int *) (task_cons->tss.esp + 4)) = (int) sht_cons;
    task_run(task_cons, 2, 2); /* level=2, priority=2 */

    /* sht_win */
    sht_win   = sheet_alloc(shtctl);
    buf_win   = (unsigned char *) memman_alloc_4k(memman, 160 * 52);
    sheet_setbuf(sht_win, buf_win, 144, 52, -1); /* 透明色なし */
    make_window8(buf_win, 144, 52, "task_a", 1);
    make_textbox8(sht_win, 8, 28, 128, 16, COL8_FFFFFF);
    cursor_x = 8;
    cursor_c = COL8_FFFFFF;
    timer = timer_alloc();
    timer_init(timer, &fifo, 1);
    timer_settime(timer, 50);

    /* sht_mouse */
    sht_mouse = sheet_alloc(shtctl);
    sheet_setbuf(sht_mouse, buf_mouse, 16, 16, 99);
    init_mouse_cursor8(buf_mouse, 99);
    mx = (binfo->scrnx - 16) / 2; /* 画面中央になるように座標計算 */
    my = (binfo->scrny - 28 - 16) / 2;

    sheet_slide(sht_back,  0,  0);
    sheet_slide(sht_cons, 32,  4);
    sheet_slide(sht_win,  64, 56);
    sheet_slide(sht_mouse, mx, my);
    sheet_updown(sht_back,  0);
    sheet_updown(sht_cons,  1);
    sheet_updown(sht_win,   2);
    sheet_updown(sht_mouse, 3);
    sprintf(s, "(%3d, %3d)", mx, my);
    putfonts8_asc_sht(sht_back, 0, 0, COL8_FFFFFF, COL8_008484, s, 10);
    sprintf(s, "memory %dMB   free : %dKB",
            memtotal / (1024 * 1024), memman_total(memman) / 1024);
    putfonts8_asc_sht(sht_back, 0, 32, COL8_FFFFFF, COL8_008484, s, 40);

    /* 最初にキーボード状態との食い違いがないように、設定しておくことにする */
    fifo32_put(&keycmd, KEYCMD_LED);
    fifo32_put(&keycmd, key_leds);

    for (;;) {
        if (fifo32_status(&keycmd) > 0 && keycmd_wait < 0) {
            /* キーボードコントローラに送るデータがあれば、送る */
            keycmd_wait = fifo32_get(&keycmd);
            wait_KBC_sendready();
            io_out8(PORT_KEYDAT, keycmd_wait);
        }
        io_cli();
        if (fifo32_status(&fifo) == 0) {
            task_sleep(task_a);
            io_sti();
        } else {
            i = fifo32_get(&fifo);
            io_sti();
            if (256 <= i && i <= 511) { /* キーボードデータ */
                sprintf(s, "%02X", i - 256);
                putfonts8_asc_sht(sht_back, 0, 16, COL8_FFFFFF, COL8_008484, s, 2);
                if (i < 0x80 + 256) { /* キーコードを文字コードに変換 */
                    if (key_shift == 0) {
                        s[0] = keytable0[i - 256];
                    } else {
                        s[0] = keytable1[i - 256];
                    }
                } else {
                    s[0] = 0;
                }
                if ('A' <= s[0] && s[0] <= 'Z') {   /* 入力文字がアルファベット */
                    if (((key_leds & 4) == 0 && key_shift == 0) ||
                        ((key_leds & 4) != 0 && key_shift != 0)) {
                            s[0] += 0x20; /* 大文字を小文字に変換 */
                        }
                }
                if (s[0] != 0) { /* 通常文字 */
                    if (key_to == 0) {   /* タスクAへ */
                        if (cursor_x < 128) {
                            /* 一文字表示してから、カーソルを1つ進める */
                            s[1] = 0;
                            putfonts8_asc_sht(sht_win, cursor_x, 28, COL8_000000, COL8_FFFFFF, s, 1);
                            cursor_x += 8;
                        }
                    } else {  /* コンソールへ */
                        fifo32_put(&task_cons->fifo, s[0] + 256);
                    }
                }
                if (i == 256 + 0x0e) {  /* バックスペース */
                    if (key_to == 0) {   /* タスクAへ */
                        if (cursor_x > 8) {
                            /* カーソルをスペースで消してから、カーソルを1つ戻す */
                            putfonts8_asc_sht(sht_win, cursor_x, 28, COL8_000000, COL8_FFFFFF, " ", 1);
                            cursor_x -= 8;
                        }
                    } else {  /* コンソールへ */
                        fifo32_put(&task_cons->fifo, 8 + 256);
                    }
                }
                if (i == 256 + 0x0f) {  /* Tab */
                    if (key_to == 0) {
                        key_to = 1;
                        make_wtitle8(buf_win,  sht_win->bxsize,  "task_a",  0);
                        make_wtitle8(buf_cons, sht_cons->bxsize, "console", 1);
                    } else {
                        key_to = 0;
                        make_wtitle8(buf_win,  sht_win->bxsize,  "task_a",  1);
                        make_wtitle8(buf_cons, sht_cons->bxsize, "console", 0);
                    }
                    sheet_refresh(sht_win,  0, 0, sht_win->bxsize,  21);
                    sheet_refresh(sht_cons, 0, 0, sht_cons->bxsize, 21);
                }
                if (i == 256 + 0x2a) {  /* 左シフト ON */
                    key_shift |= 1;
                }
                if (i == 256 + 0x36) {  /* 右シフト ON */
                    key_shift |= 2;
                }
                if (i == 256 + 0xaa) {  /* 左シフト OFF */
                    key_shift &= ~1;
                }
                if (i == 256 + 0xb6) {  /* 右シフト OFF */
                    key_shift &= ~2;
                }
                if (i == 256 + 0x3a) {  /* CapsLock */
                    key_leds ^= 4;
                    fifo32_put(&keycmd, KEYCMD_LED);
                    fifo32_put(&keycmd, key_leds);
                }
                if (i == 256 + 0x45) {  /* NumLock */
                    key_leds ^= 2;
                    fifo32_put(&keycmd, KEYCMD_LED);
                    fifo32_put(&keycmd, key_leds);
                }
                if (i == 256 + 0x46) {  /* ScrollLock */
                    key_leds ^= 1;
                    fifo32_put(&keycmd, KEYCMD_LED);
                    fifo32_put(&keycmd, key_leds);
                }
                if (i == 256 + 0xfa) {  /* キーボードがデータを無事に受け取った */
                    keycmd_wait = -1;
                }
                if (i == 256 + 0xfe) {  /* キーボードがデータを無事に受け取れなかった */
                    wait_KBC_sendready();
                    io_out8(PORT_KEYDAT, keycmd_wait);
                }
                /* カーソルの再表示 */
                boxfill8(sht_win->buf, sht_win->bxsize, cursor_c, cursor_x, 28, cursor_x + 7, 43);
                sheet_refresh(sht_win, cursor_x, 28, cursor_x + 8, 44);
            } else if (512 <= i && i <= 767) { /* マウスデータ */
                if (mouse_decode(&mdec, i - 512) != 0) {
                    /* データが3バイト揃ったので表示 */
                    sprintf(s, "[lcr %4d %4d]", mdec.x, mdec.y);
                    if ((mdec.btn & 0x01) != 0) {
                        s[1] = 'L';
                    }
                    if ((mdec.btn & 0x02) != 0) {
                        s[3] = 'R';
                    }
                    if ((mdec.btn & 0x04) != 0) {
                        s[2] = 'C';
                    }
                    putfonts8_asc_sht(sht_back, 32, 16, COL8_FFFFFF, COL8_008484, s, 15);
                    /* マウスカーソルの移動 */
                    mx += mdec.x;
                    my += mdec.y;
                    if (mx < 0) {
                        mx = 0;
                    }
                    if (my < 0) {
                        my = 0;
                    }
                    if (mx > binfo->scrnx - 1) {
                        mx = binfo->scrnx - 1;
                    }
                    if (my > binfo->scrny - 1) {
                        my = binfo->scrny - 1;
                    }
                    sprintf(s, "(%3d, %3d)", mx, my);
                    putfonts8_asc_sht(sht_back, 0, 0, COL8_FFFFFF, COL8_008484, s, 10);
                    sheet_slide(sht_mouse, mx, my);
                    if ((mdec.btn & 0x01) != 0) {
                        /* 左ボタンを押していたら、sht_winを動かす */
                        sheet_slide(sht_win, mx - 80, my - 8);
                    }
                }
            } else if (i <= 1) { /* カーソル用タイマ */
                if (i != 0) {
                    timer_init(timer, &fifo, 0); /* 次は0を */
                    cursor_c = COL8_000000;
                } else {
                    timer_init(timer, &fifo, 1); /* 次は1を */
                    cursor_c = COL8_FFFFFF;
                }
                timer_settime(timer, 50);
                boxfill8(sht_win->buf, sht_win->bxsize, cursor_c, cursor_x, 28, cursor_x + 7, 43);
                sheet_refresh(sht_win, cursor_x, 28, cursor_x + 8, 44);
            }
        }
    }
}

実装過程
・ 50277ff56ed6e48c079f5ecd4bfbaeab2098f0b4