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Re: No video, but error code from mystery 486 board

Posted on 2022-11-30, 01:36

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I've been further testing and documenting. Not expecting anyone to give me a response or solution, just wanted to document here. Turning it on after being cold seems to make it more reliable to boot. After it warms-up, and I restart it, it tends to have the no video problem. I've documented the …

Re: No video, but error code from mystery 486 board

Posted on 2022-11-29, 08:43

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

does the post card still show going thru all the codes all the way to 00? maybe the dip switch block is so old it lost contact making it think you witched back to integrated vga? wiggle those switches you can look at bt475 http://wiki.xp-el.com/_media/info:brooktree_bt475.pdf and trace pins 25 26 …

Re: No video, but error code from mystery 486 board

Posted on 2022-11-29, 06:27

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

rasz_pl wrote on 2022-11-29, 06:16: might need deoxit on isa ports? have you tried plugging it out on an again? 😀 Yeah, a few times now. Also tried swapping slots to no avail. Can't get video again. I don't have any deoxit, but would try it. Maybe I can just try cleaning with some alcohol? I am at …

Re: No video, but error code from mystery 486 board

Posted on 2022-11-29, 06:01

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

rootinit wrote on 2022-11-29, 02:36: Not sure if this is a problem with my video card, or if this board has other problems. Will have to test with other machine(s) to make certain. Tested the VGA card in another machine, and it works fine. This board is wonky.

Re: No video, but error code from mystery 486 board

Posted on 2022-11-29, 05:35

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Are there any codes before? Or just 00 all the time? There are codes before. It seems to be working properly. It would be useful to know if one can break the MB by inserting an isa card wrong way... Looking at the pinout there is all sorts of bad stuff happening then like connecting address lines …

Re: No video, but error code from mystery 486 board

Posted on 2022-11-29, 05:31

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

rasz_pl wrote on 2022-11-29, 05:05: that simm doesnt look plugged in correctly, at least in the first picture It was, I had to reseat. Unfortunately, I am having other issues. See my last response.

Re: No video, but error code from mystery 486 board

Posted on 2022-11-29, 05:29

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I found an AT 486 motherboard at an electronics resale shop with an included Intel A80486DX-33. I popped-in a 72-pin SIMM that I found elsewhere in the shop, and brought it home. Everything there is sold as-is, but I figured it was worth a try. I ordered an AT power supply, and inserted my Micro- …

No video, but code from mystery 486 board

Posted on 2022-11-29, 02:36

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I found an AT 486 motherboard at an electronics resale shop with an included Intel A80486DX-33. I popped-in a 72-pin SIMM that I found elsewhere in the shop, and brought it home. Everything there is sold as-is, but I figured it was worth a try. I ordered an AT power supply, and inserted my Micro- …

Re: Help! PC won't power on with Slotket

Posted on 2022-07-10, 20:04

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Just realized that's not actually possible to do with this Slotket. Its jumper settings only allow for the main board to choose the FSB speed or for the CPU to do it. Either way, there are no Coppermines that are actually natively at 66 MHz FSB, so I cannot make it do that. 100 MHz FSB processors …

Re: Help! PC won't power on with Slotket

Posted on 2022-07-06, 17:24

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Just realized that's not actually possible to do with this Slotket. Its jumper settings only allow for the main board to choose the FSB speed or for the CPU to do it. Either way, there are no Coppermines that are actually natively at 66 MHz FSB, so I cannot make it do that. 100 MHz FSB processors …

Re: Help! PC won't power on with Slotket

Posted on 2022-07-05, 18:02

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Does a slot processor work? The Katmai slot processors that I've used work just fine. It is the Coppermine ones (both Slot 1 and Socket 370 w/slotket) that fail to show an L2 cache. Have you tried to run one of the Coppermines at fsb 66 ? Not yet. I assume I just need to modify the jumpers on the …

Re: Help! PC won't power on with Slotket

Posted on 2022-07-05, 07:55

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Sphere478 wrote on 2022-07-05, 02:22: AlexZ wrote on 2022-07-04, 22:49: I don't think it will be a BIOS problem. More likely a damaged trace on board or a damaged socket. Does a slot processor work? The Katmai slot processors that I've used work just fine. It is the Coppermine ones (both Slot 1 and …

Re: Help! PC won't power on with Slotket

Posted on 2022-07-04, 18:58

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

My original goal with this machine was to have a single PC that could competently play games from the early 1990s into the early 2000s. Not sure if anyone else is still following this thread, but at this point, I'm just trying different sorts of CPUs to see if anything reports an actual L2 cache. …

Re: Help! PC won't power on with Slotket

Posted on 2022-06-28, 18:50

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I also installed Powerleap CPU Control in Windows, and saw that it incorrectly identified it as a Coppermine-T (probably because this one shares the same CPUID as some Coppermine-Ts). I tried to force enable the cache in this utility, but it just blue screened, and made it inoperable. powerleap-cpu- …

Re: Help! PC won't power on with Slotket

Posted on 2022-06-28, 18:28

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Thanks for checking back with me. Here are what some of these sort of utilities are showing.

Re: Help! PC won't power on with Slotket

Posted on 2022-06-28, 05:49

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Another weird thing is that I put in a SL4C8, which is also a socket 370 1 GHz PIII, but this one only has a multiplier of 7.5 with a FSB of 133 to achieve this. I thought it'd be reported as a 750MHz in the BIOS (this machine only has 100MHz FSB), but it shows as the full 1 GHz. Maybe the slotket …

Re: Help! PC won't power on with Slotket

Posted on 2022-06-28, 03:33

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Sphere478 wrote on 2022-06-28, 02:46: try a bios update? btw, I encourage you to track down the difference between those two slockets so we can know what needs to be modded in the future. 😀 BIOS is already at the latest. I'd love to track down the differences, but I'm quite lacking in electrical …

Re: Help! PC won't power on with Slotket

Posted on 2022-06-28, 01:42

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Slotket was definitely the issue with it not powering-on. I found someone who was local that sold me a Shuttle HOT-C003 rev. 3.2 (aka AZZA 370 CPU Card). Now it boots, but the weird issue is that there is no L2 cache being reported in the BIOS. I can boot after getting an error, but it is extremely …

Re: Help! PC won't power on with Slotket

Posted on 2022-06-25, 22:40

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I may have your answer, At some point they added two pins that keep the cpus from working in older mobos. As well as a second reset pin and moved power good pin. (Little rusty on specifics but something like that) I have been compiling info about mods for these and other issues in this thread: …

Re: Help! PC won't power on with Slotket

Posted on 2022-06-25, 22:32

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Well this is helping me I'm learning what brand some of my slotkets are. I'm tempted to post pics of all of them. Vogons member Luckybob has made available a compilation of slotket info here: https://drive.google.com/file/d/1kGgO3TJyFDTHKzAB5qVjaxy4wVj4GJBY/view Wow, that's a lot of great info. …

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