Int 14/AH=1Ah

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Digiboard DigiCHANNEL PC/X - SPECIAL CHARACTER FLAG/COUNTER

AH = 1Ah
BX = subfunction
00h return pointer to special character flag byte
01h return pointer to special character counter word
DX = port number (00h-03h) (04h-43h for XAPCM232.SYS)

Return:
ES:BX -> special character flag or counter

Notes: Flag is FFh if one or more special characters are in the receive buffer; it is 00h and the counter is invalid if no special characters are in the receive buffer. Counter (if valid) contains the number of characters in the receive buffer up to and including the last-received special character

Category: Serial I/O - Int 14h - D

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