IBM XT diagnostic ROM

[Rik]

Andrew,

I have one, it's not IBM but third-party.
We used it to test XT's, I'll make you a image.
It is 64k but I'll check if it's readable.
And I should have the manual some where, but it's a very simple user
interface.
And it's does test the hardware.

Rik
 

-----Oorspronkelijk bericht-----
Van: cctalk-bounces at classiccmp.org [mailto:cctalk-bounces at classiccmp.org]
Namens Andrew Lynch
Verzonden: woensdag 28 mei 2008 3:37
Aan: cctalk at classiccmp.org
Onderwerp: IBM XT diagnostic ROM

Hi,

Has anyone have or know where to get an IBM XT (5160) diagnostic ROM?  I am
trying to revive an original IBM XT motherboard which is nonresponsive and
gives no error codes (beep or POST).

I am not even sure such a ROM exists but it would be a 27C256 style EPROM
that plugs into an IBM XT motherboard to help fault isolate an almost
completely dead unit.

The motherboard CPU seems to be working based on a quick exam with the
oscilloscope.  However, the motherboard's initialization / boot process is
not making it to start up the video display before it hangs or crashes.
Obviously, something is broken but I haven't isolated exactly what yet.

If anyone can help, I would much appreciate it.  Thank you in advance.

Andrew Lynch