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- Newsgroups: comp.sys.ibm.pc.hardware,comp.unix.bsd,comp.unix.sysv386
- Path: sparky!uunet!spool.mu.edu!yale.edu!ira.uka.de!math.fu-berlin.de!fub!geminix.in-berlin.de!gemini
- 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
- --
- Uwe Doering | INET : gemini@geminix.in-berlin.de
- Berlin |----------------------------------------------------------------
- Germany | UUCP : ...!unido!fub!geminix.in-berlin.de!gemini
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