Strange IBM PS/1 (2033) error \ VOGONS

Strange IBM PS/1 (2033) error

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First post, by OVERK|LL

Posted on 2025-03-07, 04:18

OVERK|LL Offline

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Been having some random instability issues with the PS/1. Pulled the ODP, cleaned the board and the socket with alcohol thoroughly, re-installed, maybe seems a bit better? However, then it couldn't read my C-Drive after a few boots, which I'm thinking means the drive, that I thought was dying, is indeed dying, giving me an opportunity to move to CF cards.

Anyway, that's not the reason for this post.

I went to install Ontrack on the 2GB CF card, which mostly went OK. When it went to reboot, it did the same thing it does when I try to reboot Windows: It acts like it's rebooting, but then I get like a weird ch-ch-ch-ch beeping sort of chattering coming from the speaker and it never actually completes the reboot, it's just sort of frozen having this stroke. Unfortunately, I don't recall when this actually started happening, whether it was before or after I added the ODP and the ODP is a real pain to remove, so I'd like to avoid doing that again if possible.

The caps all LOOK good, the PSU is of course original, but I do recall it rebooting just fine at one point, but I unfortunately can't recall when exactly that changed.

Disabling/enabling APM in the BIOS has no impact on this behaviour.

Thoughts?

DD: Mac Pro 5,1 - X5690, 64GB, RX 580 - OCLP w/Sequoia
Projects:
- Hewitt-Rand 8088 - 640KB, 20MB, Hercules mono
- IBM PS/1 2133 w/Thermalwrong solder mod - ODP 486DX4-100, 32MB
- PCPartner VIB806DS w/233MMX, 128MB, G450
- Jetway J-TX98B w/P75, 256MB

Reply 1 of 3, by OVERK|LL

Posted on 2025-03-08, 04:40

OVERK|LL Offline

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OK, fresh install of 98SE on the CF card, 90% of the issues I was having are gone - Except the one this post is about, the inability to reboot. System does it naked (no cards), so it's not a peripheral issue. So I have to shut down windows, turn it off, then turn it back on if I want to reboot, because it cannot perform that function by itself.

I let it do it a bit longer (I normally shut it right off) and it goes from the ch-ch-ch beeping to a solid beeeeeeeeeeeeeeeeeeee after a bit.

Also worth mentioning: This board has the FSB mod done (25 -> 33Mhz), but no resistors were used (Thermalwrong didn't appear to think they were necessary, used by IBM because they were an easy way to bridge the solder points by machine). I don't THINK that's when this started (the reboot thing), I think it was some time after, but can't be 100% sure on that.

Reply 2 of 3, by OVERK|LL

Posted on 2025-03-08, 20:45

OVERK|LL Offline

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OK, found my multimeter! So I was able to at least test the PSU. 5.0V was rock solid, never deviated. 12V showed a bit of variation, particularly when the CD-ROM spun up, dropped down to 11.86V but immediately recovered and stayed solid at 12V when I was running the Quake Timedemos.

I have however managed to confirm that there is a heat component! I am able to reboot the computer when it's cold. It hadn't been run since yesterday and so when I powered it up, after it booted into 98, I rebooted, it restarted fine. I did this two more times to confirm it was not a fluke. I was also able, for the first time since I installed the ODP, to run speedsys, I assume because this is the first time I've tried to run it with the computer cold.

It normally freezes when trying to detect my IDE devices (and this happened when I tried it after switching to CF, but the computer was up to temp at that point). With a cold computer, it only froze when it tried to benchmark my CF card, which may not be a big issue:

The attachment IMG_6820.jpeg is no longer available

After making that run, I tried to reboot the computer. It behaved as described in the OP, now that the computer was warm.

I was able to run both Quake timedemos through to completion though:

The attachment IMG_6821.jpeg is no longer available

The attachment IMG_6822.jpeg is no longer available

The 360x480 one normally freezes.

So, something is getting hot and isn't happy about it.

Reply 3 of 3, by OVERK|LL

Posted on 2025-03-20, 14:20

OVERK|LL Offline

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Joined: 2025-01-31, 03:49
Location: Canada

Any ideas? I would normally think capacitors, but if it's only happening when the board warms up, that seems less likely?

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