100 lines
934 B
NASM
100 lines
934 B
NASM
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org 0x7C00
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cols: equ 80
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rows: equ 30
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main:
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mov ax, cs
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mov ds, ax
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mov es, ax
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mov ss, ax
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xor sp, sp
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mov ah, 0x42
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mov si, dap
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int 0x13
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mov ax, 0x0011
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int 0x10
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mov di, txtbuf
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.loop:
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call sync
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xor ax, ax
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int 0x16
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stosb
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jmp .loop
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hlt:
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hlt
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jmp hlt
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sync:
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push ax
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push si
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push di
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push es
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mov si, txtbuf
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mov ax, 0xA000
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mov es, ax
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mov di, 0
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mov bx, font
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mov cx, rows
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.loop:
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call charline
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loop .loop
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pop es
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pop di
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pop si
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pop ax
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ret
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charline:
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push bx
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push cx
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mov cx, 8
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.loop:
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call scanline
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call scanline
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inc bh
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loop .loop
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add si, cols
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pop cx
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pop bx
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ret
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scanline:
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push si
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push cx
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mov cx, cols
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.loop:
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lodsb
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mov bl, al
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mov al, [bx]
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stosb
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loop .loop
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pop cx
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pop si
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ret
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dap:
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db 0x10
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db 1
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dw 20
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dw font, 0
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dq 1
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times (510 - ($-$$)) nop
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dw 0xAA55
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font:
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incbin "cp437.bin"
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txtbuf:
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times (rows * cols) db 0
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end:
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