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From: gemini@geminix.in-berlin.de (Uwe Doering)
Subject: Re: IRQ2 trace on video card, which one?
Keywords: irq2, interrupt conflicts, video, serial and net cards
References: <ellis.716302427@nova> <1992Sep13.145235.3139@rwwa.COM>
Organization: Private UNIX Site
Date: Mon, 14 Sep 1992 09:54:42 GMT
Message-ID: <J6Z61RP@geminix.in-berlin.de>
Lines: 25
witr@rwwa.COM (Robert Withrow) writes:
>I would suggest the following procedure for disabling use of IRQ2 by
>VGA/EGA cards:
>
>1) Most modern boards of the just-above-bargain-basement-price-or-better
>ilk have a jumper that can be opened to disable use of IRQ2. Check your
>board's documentation, or look for a suspicious jumper.
I've had VGA boards in the past where both pins were still connected
with each other after pulling off the jumper. This was because these
pins were additionally shortened with a trace on the PCB. So I had to
cut the trace to make the jumper operable. Of course, this trace was
on the component side of the board, right under the plastic body of
the jumper field, so that it became visible only after I desoldered
the jumper field. :-(
So never trust an open jumper field to be really open. Check it with
an ohmmeter.
Uwe
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