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Re: Tandy 1000 SX motherboard mod?? (not working)

Posted on 2022-10-30, 20:16

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

BTW... Power supply voltages are good. In case someone has an idea of what should I do with it: I'm not an electronics engineer but I have some knowledge and the tools (soldering station, de-soldering gun, logic probe, oscilloscope, etc.). I have fixed several mobos over time, including a Tandy 1000 …

Re: Tandy 1000 SX motherboard mod?? (not working)

Posted on 2022-10-30, 20:00

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

A few more pics... 5. IC CD4529BE with two pins shorted: CD4529BE two shorted pins.jpg 6. Another IC (U54) with a cap across two pins: U54 with cap.jpg 7. A ceramic cap in the back: Cap in the back.jpg 8. The white cable is not connected, I wonder at which point it was. Another two traces filed off: …

Tandy 1000 SX motherboard mod?? (not working)

Posted on 2022-10-30, 19:45

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hello All! I recently bought a Tandy 1000 SX secondhand that doesn't turn on and when I opened the case I found that the motherboard has several weird mods. I wanted to think that it was a last minute factory revision/fix, but I'm starting to think that that's not the case. I compared it with a few …

Re: Biostar MB-8433UUD-A

Posted on 2022-08-28, 18:16

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

No worries, take your time. There is enough info floating around the net to figure out the jumpers (I'm not sure if all of them). I have my retro 486 PC up and running with this motherboard, but there's not an actual copy of the manual out there and it would be lovely to have.

Re: Biostar MB-8433UUD-A

Posted on 2022-08-28, 17:50

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Wow!, That's nice!! ! Would you be able to scan it and share? (If you want and have the time)

Re: Looking for Biostar MB-8500TEC ver3 Manual!

Posted on 2022-01-20, 02:23

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

NICE!!! I think it has all the jumpers that I was missing! I'll update the the doc I made and post it back. Thanks Horum!!

Re: Bought these (retro) hardware today

Posted on 2022-01-15, 01:18

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

DTK PPM-1630C motherboard, 386SX-16 with Cyrix 83S87 FPU, 1MB on-board, slots for another 4MB: http://www.arvutimuuseum.ee/th99/m/C-D/30050.htm Hi, It's been a while since you posted this note about your DTK board. Do you still have it? I'm asking because I have the same board and I need to know …

Re: Need advice on beginning soldering and "starter" equipment

Posted on 2022-01-11, 05:19

in Milliways

in Milliways

This video is from 2011, but I think it's still good general advice. It might be overwhelming to think about everything he recommends anyway. https://www.youtube.com/watch?v=R_PbjbRaO2E In my case, I don't do electronics repairs on a daily basis and I'm not an expert. I spent more that 10 years …

Re: Looking for Biostar MB-8500TEC ver3 Manual!

Posted on 2022-01-10, 23:58

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

It was something I learnt from PC Hoarder Patrol. Search Wayback for http://biostar-usa.com/ , change from the default 'Calendar' to 'URLs' (options just under the search bar). That lists all files archived from biostar-usa.com, which is lots (it says more than 10,000). Top right of the list is a …

Re: Looking for Biostar MB-8500TEC ver3 Manual!

Posted on 2022-01-10, 05:49

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

PC Hoarder Patrol wrote on 2022-01-10, 05:39: Yeah, I did look again but this list (pretty much the same as the jumper manual) seems to be it for this board - https://web.archive.org/web/19990220164452/ht … c/cpat85tec.htm Yep, there's hardly any info about it.

Re: Suggestions to build an open case for testing AT / ATX motherboards

Posted on 2022-01-10, 05:39

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Yeah, I've been looking on eBay but nothing really gets my attention. Getting an aluminum box may be a good starting point. Thanks

Re: Looking for Biostar MB-8500TEC ver3 Manual!

Posted on 2022-01-10, 05:25

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Interesting! It looks like the "newest" Bios version is i01bw429.bin, as previously posted by snufkin. I still haven't test the Bios, will report back when I do. This is an odd motherboard, it may be one of the earliest socket 7 that Biostar made. It doesn't have a ps2 mouse port which I find odd …

Suggestions to build an open case for testing AT / ATX motherboards

Posted on 2022-01-10, 05:02

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hello All. I've been looking to buy an open case to test AT and ATX motherboards, but it seems that the only options available are for ATX and above. I was wondering if anyone has build one and can share some tips or ideas.

Re: Looking for Biostar MB-8500TEC ver3 Manual!

Posted on 2022-01-10, 04:37

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Horun wrote on 2022-01-10, 04:30: Curious What format is that .doc ? Cannot open it for some reason using MS Office or Wordpad (win7). Hex edit shows PK as the header so is it zipped ? I use Libre Office. Here is a zipped docx file, let me know. Thanks

Re: Looking for Biostar MB-8500TEC ver3 Manual!

Posted on 2022-01-10, 03:55

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

There are more jumpers that are not documented and some have charts printed on the board: Jumper# / Pins / Current State JP1 (4) 3-4 (No info) JP2 (4) 3-4 (No info) JP5 (3) 1-2 (No info, might be the Bios voltage as per continuity test: 5v / 12v) JP10 (3) 2-3 (Tage Size, as per chart printed on the …

Re: Looking for Biostar MB-8500TEC ver3 Manual!

Posted on 2022-01-10, 00:57

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Possible updated BIOS (Oct 26th 1998) here: https://web.archive.org/web/20030415205633/http://biostar-usa.com:80/Archives/archivebios/86-8500/8500tec/8500tec_bios.htm Yes, that looks about right. I haven't tested it yet though. I did search there but it didn't show up. What was your search keyword?

Re: Looking for Biostar MB-8500TEC ver3 Manual!

Posted on 2022-01-10, 00:40

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Bios file v4.50PG Awesome board you found there. Added it to UR. https://www.ultimateretro.net/en/motherboards/10195 Awesome!. Keep in mind that I modded it adding a socket for the Odin RTC. If you look closer at the picture, the RTC looks a bit higher than it should. I have around 10 more socket 3 …

Re: Looking for Biostar MB-8500TEC ver3 Manual!

Posted on 2022-01-09, 08:06

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Bios file v4.50PG

Re: Looking for Biostar MB-8500TEC ver3 Manual!

Posted on 2022-01-09, 07:26

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

PC Hoarder Patrol wrote on 2022-01-09, 07:21: Dumb luck & pixie dust 😀 - happy to help Lol!! Just in case the link disappears, I made a doc file in case someone needs it one day!

Re: Looking for Biostar MB-8500TEC ver3 Manual!

Posted on 2022-01-09, 07:18

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

PC Hoarder Patrol wrote on 2022-01-09, 07:05: Try here (includes v3 specific jumpers) - https://web.archive.org/web/20010209101446/ht … EC/menutec.html WOW!! How did you find it??, I was looking all over and nothing. VOGONS community is just amazing! Thank You!!

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