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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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