Re: GA-586HX v2.01 USB pinout

Posted on 2024-02-24, 03:28

by

by kevmif

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Looks like I have power to the USB ports too - great. Though I am too scared to try wiring them up again as I thought I was sure about the voltages last time. The only thing I wasn't 100% sure of was if I had the data lines right. Surely that wouldn't fry things? Would it? Unless... could the header …

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Re: GA-586HX v2.01 USB pinout

Posted on 2024-02-22, 11:50

by

by kevmif

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Dorunkāku - thank you so, so much for your patience and excellent explanation. Believe it or not, the break was between the fuse and the 5v. Strange right? Why didn't the fuse die? crappy solder job.jpg I did my best to solder a wire and it seems to work. Nothing blew up and the keyboard was active …

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Re: GA-586HX v2.01 USB pinout

Posted on 2024-02-21, 00:38

by

by kevmif

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Am I likely to have killed the com ports too - or anything else for that matter? If I can at least get power back to the keyboard, I can use a PCI USB card. Assuming nothing else is dead...

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Re: GA-586HX v2.01 USB pinout

Posted on 2024-02-19, 10:25

by

by kevmif

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Thanks Dorunkāku. I have tested as per your suggestion and here are the results. On a WORKING board (VX chipset). I get full continuity between the 5v on the AT Keyboard port and any 5v pin on the P8/P9. On the HX board I broke, I get a flicker of continuity, then the resistance climbs to about 3o0 …

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Re: GA-586HX v2.01 USB pinout

Posted on 2024-02-17, 09:50

by

by kevmif

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Oh, thats what that thing is? Yeah, very close to zero (multimeter beeped to indicate continuity but there was some very minimal resistance (a few ohm). Does this help? https://www.dropbox.com/scl/fi/uuj6ijp57t34v4tjv1b2h/HXBoard.jpg?rlkey=2wuib2hsi4w56znsp9hr3dz9f&dl=0 Being a multi layered PCB, it …

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Re: GA-586HX v2.01 USB pinout

Posted on 2024-02-17, 09:24

by

by kevmif

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Somehow I screwed up wiring the second port. I was very careful with my voltage wires thinking the signal wires would be no worries and I could fix them later if wrong. Either way, something shorted and now I have low voltage (2v instead of 5v) on the keyboard port (obviously it doesn't work). The …

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Re: GA-586VX - CMOS settings don't save (besides date / time)

Posted on 2024-02-08, 09:44

by

by kevmif

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I purchased some DS12C887+ and DS12887A units. The 12C887+ didn't work - but the 12887A did. BIOS settings now save. Thanks everyone for your input. Most appreciated.

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Re: GA-586HX v2.01 USB pinout

Posted on 2024-01-17, 11:37

by

by kevmif

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Thanks! I made an adaptor to get one port working with my modern 10 pin plug. Should be trivial to do the same and get the second one working. Super glad I got the multimeter out to check. Thanks so much for confirming how the old 8 pin headers worked. Glad they switched to a 10 pin keyed design …

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GA-586HX v2.01 USB pinout

Posted on 2024-01-17, 09:56

by

by kevmif

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hi all! I just installed Win98 on a GA-586HX pimped out with a 233MMX and 128MB RAM (6 RAM slots woooo). Only this version of the board has no PS/2 out - all good, it supports USB. I don't have the original headers though. The more modern USB headers have 10 pins with a blank for key. The board has …

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Re: GA-586VX - CMOS settings don't save (besides date / time)

Posted on 2024-01-10, 04:09

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by kevmif

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Thanks Horun. There is no jumper to reset the CMOS. So the DS12887+ is the correct RTC chip for this board? I wonder why it still won't save anything...hmm. I got these DS12887+ chips from China a while ago and they seemed to work fine in other machines. Should I buy some DS12887A chips and try …

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Re: GA-586VX - CMOS settings don't save (besides date / time)

Posted on 2024-01-10, 02:56

by

by kevmif

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Underneath the RTC, it shows M5818. Is the M48T86PC1 that was there, or the DS12887+ a drop in replacement for an M5818?

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GA-586VX - CMOS settings don't save (besides date / time)

Posted on 2024-01-09, 23:42

by

by kevmif

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Really odd one here. No matter what I do, this GA-586VX board will not save any BIOS changes besides date and time. This means, I am stuck with Primary HDD on AUTO and cannot configure any other HDD / FDD options, nor can I change any other settings (memory timings etc). I did successfully flash it …

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Re: 486 motherboard repair

Posted on 2022-10-22, 05:17

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by kevmif

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Point L2, which I am reasonably sure is ground based on a continuity test had one of those black components which I removed to assess the traces better (same as L3 and L4). My question is, what are these components and why is one necessary for a connection to GND? Those black components are …

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486 motherboard repair

Posted on 2022-10-22, 04:01

by

by kevmif

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hi all. Hoping for some help repairing a 486 board. It is one of these: https://theretroweb.com/motherboards/s/suk-jung-sj-dg486-3vls#downloads (well very similar, looks like an earlier revision). The traces to the keyboard controller for clock, data and ground are destroyed. 5v is fine according to …

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Re: Help identify and troubleshoot this 486 board

Posted on 2022-01-28, 23:38

by

by kevmif

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Awesome stuff snufkin. Very, very interesting. So how did stuff like this happen back in the day? A competing factory in china decided to do almost a 1:1 clone of a Biostar board to save a few bucks? Surely that couldn't be cost effective? Biostar themselves decided to sell a few 'no name' boards …

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Re: Help identify and troubleshoot this 486 board

Posted on 2022-01-28, 11:18

by

by kevmif

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Going to see if I can get the DX4 working in my Soyo board as the performance of this one is just going to be woeful. Shame I got conned into a fake cache board but ah well. I was dubious that the cache was soldered but the traces were there so I thought I'd try my luck. Didn't pay too much for it. …

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Re: Help identify and troubleshoot this 486 board

Posted on 2022-01-28, 07:36

by

by kevmif

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Got it to POST. Switched to yet another video card. Simple old 512k trident. Previously been using a 1MB trident, a couple of cirrus cards and a VLB cirrus Got it to boot after swapping VLB IO card for simple ISA one. No L2 cache reported in HWINFO despite it being enabled in the bios. CPU speed is …

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Re: Help identify and troubleshoot this 486 board

Posted on 2022-01-28, 06:59

by

by kevmif

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Back to not POSTing. Same as before. Tried one stick of RAM. No change. Went back to 30pin RAM, no change. Boo 🙁

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Re: Help identify and troubleshoot this 486 board

Posted on 2022-01-28, 06:45

by

by kevmif

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Well this is odd..... I tried it with one stick of 72pin and it posted. Put the 2nd stick back in and it registered 8MB as expected. It uses a fancy BIOS that looks a little like windows 3.1 Shame if it is a fake cache board. POST screen reads GREEN-486VL with WRITE-BACK SRAM. Will plug in an IO …

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Help identify and troubleshoot this 486 board

Posted on 2022-01-28, 06:18

by

by kevmif

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hoping you good people can help me out again! See attached photo of 486 board which was sold to me as 'working'. When powering on, it fails to post. Results are Beep Beep... beep (x8), tick tick tick tick, Beep Beep. Tried the following: Multiple different types of 30 pin and 72 pin RAM. Three video …

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