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AH = 0Eh CX = number of characters to write ES:BX -> string DX = port number (00h-03h) (04h-43h for XAPCM232.SYS)
Return:
AX = number of characters actually written ZF clear if successful ZF set on error
See Also: AH=0Fh"Digiboard"
Category: Serial I/O - Int 14h - D
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