ack/mach/i86/libem/com.s

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.sect .text; .sect .rom; .sect .data; .sect .bss
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.define .com
! #bytes in cx
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.sect .text
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.com:
mov bx,sp
add bx,2
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sar cx,1
1:
not (bx)
inc bx
inc bx
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loop 1b
ret