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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