jca (04/30/83)
There is a problem with the VT18x that you may like to know about before trying to config your mboot program. The Vt180 uses interrupt driven I/O. This makes it very hard to poll the ports. Really what happens is the re- ceived char. is saved in a receive buffer. When you poll the port the receive bit has already been cleared. You must poll the receive buffers (4) to check for receive characters. To do this you need the bios listing to find the buffer locations. The buffer has header info to tell if theres data in the buffer and how much. I have configured modem4.asm to run on the vt180 and its works ok. If you would like a copy send me a disk. John Antrosiglio Bell Labs Holmdel, New Jersey 07733 (201) 949-2374 houxc!jca or houxi!vax431!jca