cCall [pPortWrite], <hPort, <OFFSET32 achBuffer> \
cchRequested, <OFFSET32 cchWritten>>
or eax, eax
jz error_handler
Called by the _VCOMM_WriteComm service to write characters to the transmit queue for the specified port. Uses the C calling convention. Must be callable at interrupt time.
_PORTINFORMATION, PortOpen, _VCOMM_WriteComm