POST Codes was Re: PDP-11/44 boot prompt

From: Marvin <marvin_at_rain.org>
Date: Mon Nov 2 15:46:03 1998

Max Eskin wrote:
>
> Actually, I'm wondering how those things work. Do they read the POST
> code off the motherboard, or do they do their own diagnosis? I've
> looked at the ads in various magazines, but never thought it had
> much potential.

Basically, the bios startup routines output a number to a port address as
they start each part of the test, and that number is displayed on the POST
card. I/O port 180h comes to mind for the IBM (it is different for Compaq)
but my memory may be faulty.
Received on Mon Nov 02 1998 - 15:46:03 GMT