Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!linus!genrad!decvax!harpo!seismo!rlgvax!cvl!joe From: joe@cvl.UUCP Newsgroups: net.micro.pc Subject: wizards needed - RS232 card and interrupts Message-ID: <413@cvl.UUCP> Date: Tue, 21-Jun-83 12:49:41 EDT Article-I.D.: cvl.413 Posted: Tue Jun 21 12:49:41 1983 Date-Received: Wed, 22-Jun-83 03:47:23 EDT Lines: 15 I'm trying to write a terminal emulator, and I need to get interrupts from the communications card. I would swear I've done everything right, but that doesn't seem to be the case. I've enabled the appropriate bits in the interrupt enable register, cleared the magic bit in the modem control register, and installed the interrupt vector. According to the debugger, the interrupt identification register shows the appropriate interrupt is pending, but it doesn't happen. Burrowing through the ROM listing revealed that there's an interrupt mask in the 8259 interrupt controller, for which I have no documentation. I tried clearing the relevant bit there, too (at least, I think it was the relevant bit). Still no dice. Any ideas? joe@cvl.arpa joe@cvl.uucp {seismo, mcnc, we13, allegra}!rlgvax!cvl!joe