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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 ax, 0x100
mov ss, ax mov ss, ax
mov ds, ax
mov es, ax mov es, ax
mov gs, ax mov gs, ax
mov fs, ax mov fs, ax
mov bp, 0xF000 xor bp, bp
mov sp, bp mov sp, bp
push ax
mov bx, 0x100 push ax
push ax
mov bx, ax
mov al, NUMSEG mov al, NUMSEG
inc ah inc ah
mov cl, ah
xor ch, ch
xor dh, dh
int 13h
xor cx, cx xor cx, cx
mov ds, cx mov ds, cx
mov word [ds:0x21*4], int21 mov word [ds:0x21*4], int21
mov word [ds:0x21*4+2], 0 mov word [ds:0x21*4+2], cx
mov cl, ah
inc ch xor dh, dh
mov ds, cx int 13h
push 0x100 pop ds
push 0x100
retf retf
int21: int21: