Toshiba T5200 PIT Error \ VOGONS

Toshiba T5200 PIT Error

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First post, by lizardb0y

Posted on 2021-07-13, 00:36

lizardb0y Offline

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Rank: Newbie
Posts: 2
Joined: 2019-06-29, 10:57
Location: New Zealand

I was working on my T5200 yesterday and had to turn it off and on again. It now won't boot. As soon as it's turned on it throws a PIT error and won't continue to boot.

With @IanB's patched Award 5.30 BIOS it gives this error:

PIT ERROR
READ DATA = FFH
WRITE DATA = 55H

With the original BIOS (I can't remember the version) it hangs before anything is displayed.

The service manual shows the programmable interval timer is provided by a "super integration" IC T4758A which seems to be a custom IC unique to the T5200. I'm hoping it's not a failed T4758A. Does anyone have any suggestions for anything I can check to isolate the fault?

Thanks,

Reply 1 of 2, by Horun

Posted on 2021-07-13, 02:21

Horun Offline

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Sorry have no answer as have never seen a BIOS put up that error message. A quick search suggests a problem with the system board which you already figured out 😐

Hate posting a reply and then have to edit it because it made no sense 😁 First computer was an IBM 3270 workstation with CGA monitor. Stuff: https://archive.org/details/@horun

Reply 2 of 2, by lizardb0y

Posted on 2021-07-13, 04:54

lizardb0y Offline

Rank Newbie

Rank: Newbie
Posts: 2
Joined: 2019-06-29, 10:57
Location: New Zealand

Horun wrote on 2021-07-13, 02:21:

A quick search suggests a problem with the system board which you already figured out 😐

Yeah, "Step 1. Replace system board" lacks the granularity I was hoping for 😉 I'd be happier if it was an IC I could source from anywhere but that doesn't seem to be the case.

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