3c503 etherus interruptus

Tim Wright tim at dell.co.uk
Tue Feb 12 03:47:49 AEST 1991

In <1991Feb8.162601 at epic.bellcore.com> karn at epic.bellcore.com (Phil R. Karn) writes:

>In article <1991Feb7.144231.1699 at ux1.cso.uiuc.edu>,
>klefstad at ux1.cso.uiuc.edu (Sue Klefstad) writes:
>|> The 3C503 defaults to interrupt 3.  If you're using a
>|> 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.

EGA cards used IRQ2/9 for the retrace interrupt. Any decent VGA cards either
have this disabled by default or have an option to disable it. It is not
necessary and as you have noticed, gobbles up a *valuable* interrupt line.

Tim Wright, Dell Computer Corp. (UK) | Email address
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Tel: +44-344-860456                  | Uucp: ...!ukc!delluk!tim
"What's the problem? You've got an IQ of six thousand, haven't you?"

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