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AX = 164Bh BL = bits to set BH = bits to clear CL = byte 1 DX = port number (00h-03h) (04h-43h for XAPCM232.SYS)
Return:
AH = status 00h successful 80h error FFh error
See Also: AH=16h"Digiboard" - AX=1649h - AX=164Ch
Category: Serial I/O - Int 14h - D
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