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From: jh@efd.lth.se (Joergen Haegg)
Newsgroups: comp.sys.ibm.pc.hardware
Subject: GPIB card PC2A from National Instruments, how does it work?
Message-ID: <1991Jun18.143723.2177@lth.se>
Date: 18 Jun 91 14:37:23 GMT
Sender: newsuser@lth.se (LTH network news server)
Reply-To: jh@efd.lth.se (Joergen Haegg)
Organization: Lund Institute of Technology, Sweden
Lines: 21


I have a PC2A GPIB interface from National Instruments (rev A) and I am
trying to use it with Unix.
I have written my own device-driver, and it works fine if I
could get IRQ right.
The problem is that I don't know how the card handles IRQ.
IRQ seems to be blocked somewhere so I
have wired INT on the 7210 chip directly (through a free buffer)
to IRQ, and so I get my interrupt. But it seems as if I need some form
of synchronization.


I lost track of IRQ in a bunch of TTL and PAL, which probably has something
with DMA to do.

Does anyone know how I enable and use IRQ (and maybe DMA)?
-- 
Joergen Haegg				jh@efd.lth.se	postmaster@efd.lth.se
System manager @ efd			046-107492
Lund Institute of Technology		E-huset, DDG, Ole R|mers v. 3
					221 00 LUND, Sweden