ack/mach/i86/libem/sbi.s

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.sect .text; .sect .rom; .sect .data; .sect .bss
.sect .text
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.define .sbi
! #bytes in cx , top of stack in ax
.sbi:
pop bx ! return subress
cmp cx,2
jne 1f
pop cx
sub ax,cx
neg ax
jmp bx
1:
cmp cx,4
jne 9f
pop dx
pop cx
sub cx,ax
mov ax,cx
pop cx
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sbb cx,dx
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push cx
jmp bx
9:
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.extern EODDZ
.extern .trp
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mov ax,EODDZ
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push bx
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jmp .trp