3c503 etherus interruptus

[Tim Wright]

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
>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.

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
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