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oem/vertical_retrace.asm

Last active August 29, 2015 13:57
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vertical_retrace.asm
VWAIT proc near
pusha
mov dx, 3DAh
v1:
in al, dx
and al, 008h
jnz v1
v2:
in al, dx
and al, 008h
jz v2
popa
ret
VWAIT endp
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