Re: Linux Post codes during runtime, possibly OT

H. Peter Anvin
2001-01-25T22:27:10Z

Followup to: <3A709E99.25ADE5F6@echostar.com>
By author: "Ian S. Nelson" <ian.nelson@echostar.com>
In newsgroup: linux.dev.kernel
>
> I'm curious. Why does Linux make that friendly 98/9a/88 looking
> postcode pattern when it's running? DOS and DOS95 don't do that.
>
> I'm begining to feel like I can tell the system health by observing it,
> kind of like "seeing the matrix."
>

It output garbage to the 80h port in order to enforce I/O delays.
It's one of the safe ports to issue outs to.

-hpa
--
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"Unix gives you enough rope to shoot yourself in the foot."