Re: Requesting info and assistance on this VLB motherboard

Posted on Yesterday, 20:20

by

by byte_76

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Thank you for the confirmation and the time spent to assist me with this. l’ll send the BIOS image to TRW so that they finally have at least one for this board. Yes, I suppose for a 1993 board, I couldn’t have expected much. At least the Intel and AMD DX4 processors that I have do seem to work …

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Re: Requesting info and assistance on this VLB motherboard

Posted on Yesterday, 15:48

by

by byte_76

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The board uses an AMI BIOS. (One of those that has the mouse support) Would it be possible to add support for the Am5x86 P75 in the BIOS? Unfortunately, modding an AMI WinBIOS is not (yet) possible. But modding an Award BIOS for Am5x86 support is no problem. To help you find a replacement Award …

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Re: Chinese Rage XL PCI mods, improved compatibility and looking for a good overclock.

Posted on Yesterday, 13:57

by

by byte_76

in Marvin \ Video

in Marvin \ Video

The method shown by @360alaska2 and cutting the traces on the PCI connector, seems to me the simplest method for these cards to work in any PCI slot. The method I posted, I think it is the most complete but a little more complicated, but simple anyway. Not cutting the traces on the PCI connector is …

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Re: Requesting info and assistance on this VLB motherboard

Posted on Yesterday, 07:41

by

by byte_76

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The board uses an AMI BIOS. (One of those that has the mouse support) Would it be possible to add support for the Am5x86 P75 in the BIOS? Unfortunately, modding an AMI WinBIOS is not (yet) possible. But modding an Award BIOS for Am5x86 support is no problem. To help you find a replacement Award …

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Re: Requesting info and assistance on this VLB motherboard

Posted on 2025-04-26, 18:32

by

by byte_76

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I've been messing with this board trying to get my Am5x86 133 working on it. I've had some success in that I was able to get the CPU working at 133MHz and 150MHz. In both cases, the boot screen shows 100MHz but I can see in CHKCPU that the processor is clocked at the speeds that I have configured. …

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Re: HELP, identify parts on my Asus P3B-F

Posted on 2025-04-26, 11:09

by

by byte_76

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Are those broken traces?

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Re: Need help - Tekram P6PRO-A5 Troubleshooting

Posted on 2025-04-25, 20:59

by

by byte_76

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Just to be clear, I am measuring between matching PIN numbers of slot 1 and slot2 and again slot 1 and slot 3 and also, just to compare, I'm measuring between slot 2 and slot 3 I've re-checked pins 26 and 28 and confirmed continuity to their matching pins in the other slots. Must have been a bad …

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Re: HELP, identify parts on my Asus P3B-F

Posted on 2025-04-25, 20:24

by

by byte_76

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Can you post some high resolution pics of your board as it is today so that the community can try to help look for any other missing components? Have you checked for bent pins inside the CPU slot? How did you clean the board? Did you wash it with soap and water? Did you remove the BIOS rom chip …

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Re: Need help - Tekram P6PRO-A5 Troubleshooting

Posted on 2025-04-25, 17:12

by

by byte_76

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Okay so testing each pin of the memory slots from the top gives me near identical readings for all slots. I cannot find anything suspicious there. It's the same pins on different sockets that should be checked for continuity, not any other way, e.g. pin 2 of slot1 and pin 2 of slot3 (Data 0) and so …

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Re: Problems overclocking 5x86 of Gigabyte Ga 5486al Motherboard

Posted on 2025-04-25, 12:50

by

by byte_76

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I've managed to push my Am5x86 chip to 200 MHz on several different motherboards using the same CPU. I don’t have a complete list of the boards right now, but I can take some photos and share them when I get the chance. Even the GA-5486AL board can run at 4×50 MHz with some minor modifications. As …

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Re: Problems overclocking 5x86 of Gigabyte Ga 5486al Motherboard

Posted on 2025-04-25, 12:19

by

by byte_76

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I have around 40 AM5x86 processors, and only 2 of them run stably at 180MHz and 200MHz. So it's likely more about the CPUs themselves than the jumpers. As soon as a processor requires more than 4V just to run at 160MHz, it means further overclocking is neither possible nor stable. At what voltage …

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Re: Need help - Tekram P6PRO-A5 Troubleshooting

Posted on 2025-04-24, 19:28

by

by byte_76

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Okay so testing each pin of the memory slots from the top gives me near identical readings for all slots. I cannot find anything suspicious there. Pressing on the north bridge while resetting the system has no effect at all. Pressing around the board also seems to have no effect. I've cleaned a …

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Re: Problems overclocking 5x86 of Gigabyte Ga 5486al Motherboard

Posted on 2025-04-24, 16:17

by

by byte_76

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Does anyone know how to get the bus to 60MHz on this GA-5486AL motherboard? According to this video it's possible but the documentation only provides details for 25, 33 and 40MHz. https://www.youtube.com/watch?v=Zg8S0pUEHAQ that is my video, here you go https://i.imgur.com/lRLgYkM.jpeg I've tested …

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Re: Problems overclocking 5x86 of Gigabyte Ga 5486al Motherboard

Posted on 2025-04-24, 14:58

by

by byte_76

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Thank you very much. Looking forward to trying this with my board and CPU. My CPI doesn’t reach 160 at 3.3V but it works on 4V.

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Re: Need help - Tekram P6PRO-A5 Troubleshooting

Posted on 2025-04-24, 05:49

by

by byte_76

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

This motherboard was the one I had in the early 2000s with a 700MHz Pentium III, still have it, but avoid using for a build. SDRAM slots are basically wired in parallel, except for some control signals like /WE, /CSx, /CAS, CKx (clock) etc. Compare the data (64) and address (14) bus pins of the …

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AMD 486 SV8B vs NV8T — Is there a performance difference

Posted on 2025-04-23, 12:44

by

by byte_76

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

My motherboard manual lists the AMD DX4-100 SV8B as “Enhance” and the DX4-100 NV8T as “No Enhance” SV8B = Write-Back NV8T = Write-Through I have both of these processors and benching them in this same motherboard using Phil’s Dosbench suite, they score the same results. To be sure, I’ve used CHKCPU …

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Re: Working ISA diagnostic card

Posted on 2025-04-23, 12:18

by

by byte_76

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Sounds to me like the BIOS is not initializing at all. Either chipset or BIOS issue most likely. Could also be RAM. Are you getting any PC Speaker beep codes? Have you tried it on a working motherboard with ISA slots? Yes, i was testing those cards on working motherboards (486, pentium), with ISA …

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Re: Tekram P6PRO-A5 Troubleshooting

Posted on 2025-04-23, 09:55

by

by byte_76

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I have measured each and every pin of the faulty memory slot to ground and the readings are the same as the other slots. Why would this one slot cause the system to beep repeatedly and not POST, while the other two slots work just fine? The only other slightly unusual thing is a whistle or whine …

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Re: Chinese Rage XL PCI mods, improved compatibility and looking for a good overclock.

Posted on 2025-04-23, 08:42

by

by byte_76

in Marvin \ Video

in Marvin \ Video

I’ve seen a mix of mods in this thread but there does not seem to be a consensus on how to proceed. Is there a confirmed simple but safe method that everyone can follow to mod these cards to work in vintage systems with 5V PCI slots while still being safe to plug into a newer system? (For those of …

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Re: Matrox G450 PCI any good use?

Posted on 2025-04-23, 05:15

by

by byte_76

in Marvin \ Video

in Marvin \ Video

My board has an Award BIOS. (GA-5486AL) It looks like the typical interface with the blue background. https://theretroweb.com/motherboards/s/gigabyte-ga-5486al I have tested my Matrox G450 in my Asus P3B-F slot 1 machine and it works fine.

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