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Re: Keyboard crashes on old 386 motherboard

Posted on 2021-11-08, 10:14

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Question for the board: I've noticed that the data line of the KBC chip look very different on the affected MB than another one. On a working motherboard they look like usual: a mess of pulses. On the affected MB, there seem to be much less activity which slightly changes when using the keyboard. …

Re: Keyboard crashes on old 386 motherboard

Posted on 2021-11-05, 15:02

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

little update XTAL 2 is grounded - hence no signal. Not sure whether it's not supposed to be grounded but it is and could not find a shorted component so far. I then did a little patchwork, lifted some of the VIA legs, connected XTAL1 to GND and XTAL2 to clock. It was not very good so the …

Re: Keyboard crashes on old 386 motherboard

Posted on 2021-10-28, 17:33

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I didn't think of searching for the VT82C42, I was looking for the 8042! The datasheet is very clear and explains a lot. Yes, either case I should have the clock on XT2 so I'll investigate on that. Thanks a lot, I'll follow up with my findings!

Re: Keyboard crashes on old 386 motherboard

Posted on 2021-10-27, 20:17

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I shall capture some screenshots and update here. In the meantime, would you be able to share the datasheet with me? For the life of me I cannot find it anymore... 😀 Thanks!

Re: Keyboard crashes on old 386 motherboard

Posted on 2021-10-26, 19:07

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I've received the VT82C42. Unfortunately it works on other motherboards but not on this one. I then realised I did not do a more simple test: I put the suspected faulty KBC on another motherboard and everything works fine. No issues. So the chip is good. I then started scoping the chip on the …

Re: Trident TVGA8900D - corrupted video output

Posted on 2021-10-19, 09:34

in Marvin \ Video

in Marvin \ Video

Umm, you wrote that it worked for a moment... I cannot find that - if I did, I did not mean that. It used to work, then it started showing those inversed text. Then, all of a sudden, it was fine again. I have been unplugging and re-plugging that board many times as you may imagine so I doubt it was …

Re: Trident TVGA8900D - corrupted video output

Posted on 2021-10-18, 21:10

in Marvin \ Video

in Marvin \ Video

good point as it only happens with some resolutions - but not with another video card on this monitor. Any other videocards I tried on this monitor does not show issues. Unfortunately I don't have a CRT monitor around... That said maybe you're right: the stripes move around when I change the "phase" …

Re: Trident TVGA8900D - corrupted video output

Posted on 2021-10-18, 19:48

in Marvin \ Video

in Marvin \ Video

I found some 0.1uF capacitors in my stock - not sure if those are the right type but I gave it a go. No change. Edit: Oh, on a different motherboard it works fine! :D However another similar video card on this motherboard works fine.... uhm... (Stripes are always there but that's always been the …

Re: Trident TVGA8900D - corrupted video output

Posted on 2021-10-18, 19:13

in Marvin \ Video

in Marvin \ Video

I'd be happy to try but... this card used to work (with stripes but...) so I assume something has broken? Or are you suggesting that the original design was poor so maybe a capacitor got a bit worse and now I see corruption? I tried removing the top two chips - they're labelled U5-6 and U7-8 but the …

Re: Trident TVGA8900D - corrupted video output

Posted on 2021-10-18, 18:08

in Marvin \ Video

in Marvin \ Video

interesting, thanks. You mean as highlighted on the pic below? What type and value of caps would you recommend? Thanks!

Trident TVGA8900D - corrupted video output

Posted on 2021-10-18, 17:53

in Marvin \ Video

in Marvin \ Video

Hi all, I have a Trident ISA video card which has always been a bit glitchy. That was bought as "faulty" and I believe all I found was a capacitor that needed replacing. It's been working since, even though on some graphic the output is "striped", see picture below. (Please ignore the big black …

Re: Small Vintage AT case

Posted on 2021-10-14, 13:43

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The mini sounds good. Crammed is not a problem. Riser cards maybe not as a board I have has a mixture of PCI, ISA and AGP. Not to mention the ones with VLB. Does anybody have the full dimension of a mini AT case?

Small Vintage AT case

Posted on 2021-10-14, 13:08

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hi all I’d love to house one of my vintage motherboards in a case so I can use it more regularly. However I’d like to keep the space used by it at minimum. All my MBs are ‘baby’. I only need space for the CD-ROM, a sound card, the video card and maybe a third one. What would be the smallest form …

Re: FIC PT-2003 temperature issue

Posted on 2021-10-13, 10:01

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

great job! thanks for updating!

Re: Shuttle 591P motherboard

Posted on 2021-10-12, 19:16

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

If someone is interested in publishing the BIOS I uploaded, that is dated 18/04/2000 and is not the latest one.

Shuttle 591P motherboard

Posted on 2021-10-11, 21:34

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hi all, I've purchased a faulty Shuttle 591P motherboard. In fact, it works ok but it has bulged capacitors which I plan to replace soon. At some point I popped the BIOS chip (29EE010) into my programmer. Saved the BIOS and programmed the latest version I found online. Since then, the board has …

Re: Keyboard crashes on old 386 motherboard

Posted on 2021-09-29, 18:17

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

When you boot the computer with older AMI bios the last letter in the bottom bios string is the Keyboard controller version. example: 40-00AG-001247-00101111-060692-SIS3486- F. The -F is the "KBC rom version". Try to match the version as not all are interchangeable but many are. The last string is …

Re: FIC PT-2003 temperature issue

Posted on 2021-09-28, 08:44

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

oh sorry, I was watching at the wrong picture! Well, your analysis seems correct, so it is now just a matter of waiting I guess! Keep us posted!

Re: 486 motherboard CPU voltage issue

Posted on 2021-09-27, 20:27

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

hey thanks a lot for your comment! @whitepawn Good question about the SIS 486G board - I do remember I had to add a 3.3V regulator as the board was not featuring one. I posted some questions here - and the community was very helpful as usual. https://www.vogons.org/viewtopic.php?f=46&t=62435 I have …

Re: Keyboard crashes on old 386 motherboard

Posted on 2021-09-27, 15:29

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I will give it a go, thanks. The other KBC I tried is indeed an AMI KBC. I'll pay attention to the version. What about the VIA "generic" KBC which are mentioned on the internet? The VT82C42. Thanks

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