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AH = 0Dh DX = port number (00h-03h) (04h-43h for XAPCM232.SYS)
Return:
ES:BX -> CH_KEY_RDY flag (see #00339)
See Also: AH=0Ah"Digiboard"
(Table 00339) Values for Digiboard CH_KEY_RDY flag: 00h receive buffer empty FFh characters available
Category: Serial I/O - Int 14h - D
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