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starport-ii-nasm
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i dare you to make this code smaller

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mothcompute 2022-06-10 04:57:46 -07:00 committed by GitHub
parent d3d7dd43e8
commit 7f6495f744
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1 changed files with 10 additions and 15 deletions
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25
boot.s
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@ -7,30 +7,25 @@ NUMSEG equ (1993/512)+1 ; filesize is 1993 bytes
mov ax, 0x100
mov ss, ax
mov ds, ax
mov es, ax
mov gs, ax
mov fs, ax
mov bp, 0xF000
xor bp, bp
mov sp, bp
mov bx, 0x100
push ax
push ax
push ax
mov bx, ax
mov al, NUMSEG
inc ah
mov cl, ah
xor ch, ch
xor dh, dh
int 13h
xor cx, cx
mov ds, cx
mov word [ds:0x21*4], int21
mov word [ds:0x21*4+2], 0
inc ch
mov ds, cx
push 0x100
push 0x100
mov word [ds:0x21*4+2], cx
mov cl, ah
xor dh, dh
int 13h
pop ds
retf
int21: