peter.dorfman@office.wang.com (06/27/91)
I am trying to use the Microsoft C int86 call to interrupt 20 (14H) in order to access the modem on a Hyundai AT clone. The modem is an Everex Hayes compatible. DOS = 3.2. I initialize the serial port for the modem (using int86) then send a series of command characters to the modem (int86). But the modem does not seem to respond. And worse, after the routine completes the system typically hangs soon afterward and needs to be rebooted. The communications programs on my system work fine, so I know that the hardware in alright. Can anybody tell me what I'm doing wrong? What is the proper sequence of operations? Thanks in advance for any assistance.