gc0d+@andrew.cmu.edu (Glenn Cadoret) (08/22/89)
I have been trying to write a program for an IBM-AT which will catch interrupts from COM1. It is my understanding that three things must be done to enable this type of interrupt: 1) Bit 7 of 0x3FB must be set low 2) Bits 0-3 of 0x3F9 must be set high 3) Bit 4 of 0x21 must be set low I do all of these things, but I still don't see an interrupt. Specifically, I am interested in the interrupt which is generated when a character comes into the port. If anyone could suggest why program is not working, it would be greatly appreciated. Many thanks, Glenn Replies to: gc0d@andrew.cmu.edu (E-mail) (703) 760-1429 (Voice)