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From: newbery@stout.atd.ucar.edu (Santiago Newbery)
Newsgroups: comp.dcom.lans,comp.protocols.tcp-ip.ibmpc,comp.sys.ibm.pc.hardware,comp.unix.xenix.misc,comp.unix.xenix.sco
Subject: Re: 3c503 etherus interruptus
Message-ID: <10226@ncar.ucar.edu>
Date: 8 Feb 91 23:11:48 GMT
References: <1991Feb3.225956.28698@m2xenix.psg.com> <1991Feb7.144231.1699@ux1.cso.uiuc.edu> <1991Feb8.162601@epic.bellcore.com>
Sender: news@ncar.ucar.edu
Reply-To: newbery@stout.atd.ucar.edu (Santiago Newbery)
Organization: National Center for Atmospheric Research
Lines: 21

In article <1991Feb8.162601@epic.bellcore.com>, karn@epic.bellcore.com
(Phil R. Karn) writes:
|>In article <1991Feb7.144231.1699@ux1.cso.uiuc.edu>,
|>klefstad@ux1.cso.uiuc.edu (Sue Klefstad) writes:
|>|> The 3C503 defaults to interrupt 3.  If you're using a
|>DEVICE=ETH503.SYS
|>|> in your config.sys, you'll need to specify interrupt 2 there:
|>|> DEVICE=ETH503.SYS /I:2
|>
|>Be careful. Although it is not widely documented, VGA cards (and I
|>believe EGA) use IRQ2 to signal vertical retrace.
|>
|>Phil
           
The above is true, however most current VGA cards (Orchid Pro Des II,
Video 7 VGA 1024i, etc.) come with IRQ 2 disabled by default.
As stated in their doc, it only needs to be enabled (via jumper/switch)
for *old* S/W that requires the vert. retrace interrupt.


Santiago