Re: Compaq Portable III Motherboard / CPU Problems

Posted on 2021-09-09, 06:32

by

by starhawk

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

These are the additional photos I have of the spare Compaq Portable III supply. Filename 20210909_014337.jpg File size 1.66 MiB Views 1088 views Filename 20210909_014312.jpg File size 1.91 MiB Views 1088 views Filename 20210909_014312.jpg File size 1.91 MiB Views 1088 views

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Re: Compaq Portable III Motherboard / CPU Problems

Posted on 2021-09-09, 06:29

by

by starhawk

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

These photos show the spare Compaq PSU. I have more that I'll attach shortly. 20210909_014233.jpg 20210909_014229.jpg 20210909_014224.jpg 20210909_014213.jpg 20210909_014159.jpg For a couple of good (well, to me!) reasons, I'm not likely to bother with the other supply. One, you pretty well have to …

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Re: Compaq Portable III Motherboard / CPU Problems

Posted on 2021-09-07, 21:03

by

by starhawk

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

My other 5.25in slim drive (AAARGH @ Compaq 🤣) is a Canon MD5501 slim variant. Anyone have power consumption data on that? I can't find squat -- really in terms of *any* documentation, even for the standard-height version.

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Re: Compaq Portable III Motherboard / CPU Problems

Posted on 2021-09-07, 20:23

by

by starhawk

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

"What is this?" "It's your father's thread-bump. This is the method of an OP. Not as clumsy or as random as a troll, but an elegant device for a more civilized age."

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Re: Compaq Portable III Motherboard / CPU Problems

Posted on 2021-09-06, 23:36

by

by starhawk

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Ridiculous as it may seem, I'd like to at least *try* to keep the electronics somewhat period for now.

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Re: Compaq Portable III Motherboard / CPU Problems

Posted on 2021-09-06, 18:52

by

by starhawk

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I have a "multi component tester" (like this -- https://i.imgur.com/1nNmZ2d.jpg ) but I don't have anything that works in-circuit (unless those do? I actually don't know) and I'm really awful at desoldering. Multiple rework cycles is going to be a very bad thing here TBH. What's worse is that Compaq …

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Re: Compaq Portable III Motherboard / CPU Problems

Posted on 2021-09-06, 18:06

by

by starhawk

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I don't even know enough to do that with it 🙁 But I'm gonna need help diagnosing the rest anyhow. Again -- any guides out there? Failing that, anyone willing to guide me here?

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Re: Compaq Portable III Motherboard / CPU Problems

Posted on 2021-09-06, 17:31

by

by starhawk

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

"I am going to bahmp yoo aaahp!"

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Re: Compaq Portable III Motherboard / CPU Problems

Posted on 2021-09-05, 19:42

by

by starhawk

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Guides or advice/suggestions *plz*? I have an electronics background, I can do this, but I'm not experienced specifically with power supplies. I have several multimeters and a dedicated (cheap tho) continuity tester. I also have a *very* old oscilloscope, but it dates from the mid-1960s (no joke, …

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Re: Compaq Portable III Motherboard / CPU Problems

Posted on 2021-09-05, 02:12

by

by starhawk

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I'm pretty sure I shouldn't use this power supply! Filename 20210904_220338.jpg File size 1.98 MiB Views 1213 views File comment Burnt toast! YIKES!! Nothing else looks bad tho -- no visibly bad caps or anything. But that is one KFC Extra Crispy resistor!

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Re: Compaq Portable III Motherboard / CPU Problems

Posted on 2021-09-05, 01:52

by

by starhawk

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I'm about to pop the lid off my parts-machine PSU to see what I'll be facing. Any good guides out there? I've not googled but I'm generally pretty horrible at google.

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Re: Compaq Portable III Motherboard / CPU Problems

Posted on 2021-09-05, 00:39

by

by starhawk

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Well, for one, the power supply has had it 🙁 I have a whole parts MACHINE, thankfully -- short of drives and the slidey inner part of the drive cage that the drives actually mount to... I'll swap the rest of the system over, I think, and test it there.

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Compaq Portable III Motherboard / CPU Problems

Posted on 2021-09-04, 19:54

by

by starhawk

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

FINALLY got back to the Compaq Portable III repair after ignoring it since early July lol. When I'd left it, the display wasn't coming on. I'd assumed it was a power supply issue, as the supply needs a minimum 1amp load on the 12v rail and this was immediately after swapping the 42meg (!) Conner …

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Re: Compaq Portable III (286) / 386 Plasma Display Controller -- Native Protocol?

Posted on 2021-07-13, 11:54

by

by starhawk

in Marvin \ Video

in Marvin \ Video

HV is on a separate connector 😉

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Re: Compaq Portable III (286) / 386 Plasma Display Controller -- Native Protocol?

Posted on 2021-07-13, 08:43

by

by starhawk

in Marvin \ Video

in Marvin \ Video

OK, I have an auditory logic probe, a dedicated continuity tester, and a number of multimeters. For right now I'd strongly prefer to keep this out of an actual Compaq Portable III, although I do have one such machine -- it is not operational right now, however, and it has display issues as part of …

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Re: Compaq Portable III (286) / 386 Plasma Display Controller -- Native Protocol?

Posted on 2021-07-12, 22:03

by

by starhawk

in Marvin \ Video

in Marvin \ Video

Gotta be ISA-8. Look at the number of pins. ISA-8 = 62 pins ISA-16 = 62 pins + 36 pins = 98 pins 50 pin IDC + 10 pin IDC = 60 pins So either it's ISA-8 minus its two front teeth (LOL) -- I'm not sure specifically which, but T/C [Terminal Count], CLOCK [System Clock; see below], /REFRESH [DRAM …

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Re: Compaq Portable III (286) / 386 Plasma Display Controller -- Native Protocol?

Posted on 2021-07-08, 15:09

by

by starhawk

in Marvin \ Video

in Marvin \ Video

Haven't had a chance to *take* em 😉 I live in an apartment with subsidized rent and I have an inspection tomorrow. It's gonna be a couple days, I need to clean and then I need to sleep...

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Compaq Portable III (286) / 386 Plasma Display Controller -- Native Protocol?

Posted on 2021-07-07, 04:29

by

by starhawk

in Marvin \ Video

in Marvin \ Video

Hi! I have a display and controller card out of a Compaq Portable III, the 286 'lunchbox' model. This was also used, identically, on the Compaq Portable 386 from what information I have available. Mine is marked as an Assembly # 000932-001, with serial and revision numbers unmarked. A sticker at the …

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Re: Compaq Portable III (286 / *NOT* Portable 386!) 'Diagnostic Disk' Media Request

Posted on 2021-05-13, 05:46

by

by starhawk

in Marvin \ Software

in Marvin \ Software

Handled by an old friend on Twitter of all places, so no longer needed.

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[SOURCED ELSEWHERE / NEVER MIND, SORRY] Compaq Portable III (286 / *NOT* Portable 386!) 'Diagnostic Disk' Media Request

Posted on 2021-05-11, 10:55

by

by starhawk

in Marvin \ Software

in Marvin \ Software

This has been an absolute RIDICULOUS sequence of events. So I *finally* got around to fixing my Compaq Portable III... or, well, I got about halfway :-1: This system uses the classic 'trick' of a Dallas Semi battery-backed RTC+RAM -- that of course had its battery expire sometime around the …

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