RAM is not in one stick of 16MB is it? Need 2 sticks of 72pin in a Pentium board, each is 32 bits wide and you need a 64bit data path for a Pentium.

BitWrangler wrote on 2024-03-15, 00:06:

RAM is not in one stick of 16MB is it? Need 2 sticks of 72pin in a Pentium board, each is 32 bits wide and you need a 64bit data path for a Pentium.

nope, two sticks of 8MB.

pull out TAG ram, U18 - slim chip between CPU socket and upper edge of board, remove JP8 JP9 and switch JP10 to 2-3

rasz_pl wrote on 2024-03-15, 07:44:

pull out TAG ram, U18 - slim chip between CPU socket and upper edge of board, remove JP8 JP9 and switch JP10 to 2-3

Just tried that to see if any difference... Nope, still throws C6

that was with COAST module removed, right?
thats not good, those jumpers should disable onboard cache, leaves maybe cache controller as a suspect?
As a last resort you can try looking at 82438VX/82437VX pins with magnifying glass and toothpick testing if any are loose.

rasz_pl wrote on 2024-03-15, 20:53:

that was with COAST module removed, right?
thats not good, those jumpers should disable onboard cache, leaves maybe cache controller as a suspect?
As a last resort you can try looking at 82438VX/82437VX pins with magnifying glass and toothpick testing if any are loose.

Yes, the COAST was removed. hell, i even tried switching to an ATX supply thru an adapter to rule out power issues.

yep, gonna check the pins on the chipset next.

I would want to check voltages at CPU and cache to make sure there's no onboard power issues.

BitWrangler wrote on 2024-03-16, 00:14:

I would want to check voltages at CPU and cache to make sure there's no onboard power issues.

CPU/Cache voltages check out OK. honestly, quite stumped here.

Try touching all chips with the system on, if any is hot. Maybe something shorted, it is old hardware after all.

Do you have it inside a case or is it loose? Check for any bent pins on the underside, maybe some are touching others.

Paar wrote on 2024-03-16, 19:50:

Try touching all chips with the system on, if any is hot. Maybe something shorted, it is old hardware after all.

Do you have it inside a case or is it loose? Check for any bent pins on the underside, maybe some are touching others.

was inside the case. no bent pins noticed, and the only chip getting warm is the CPU.

Voltage of the power mosfets? If you have a P-120 Vcore and Vi/o should be 3.3V

https://www.arl.wustl.edu/projects/archive/gi … X_Datasheet.pdf

http://www.dickhardtstrasse.org/Hardwarehandb … ml?cpu_486.html

This should help with pin identification.

Post pics of the board, hq if possible, for visual inspection. Here some have eagle eyes 😀

Pull the cards out. Change multiplier setting to 1.5x, move ram sticks to other slots or try different sticks, unplug drive cables, re seat cpu, check power supply voltages, check cpu voltage, and clear cmos.

Nexxen wrote on 2024-04-03, 02:44:

Voltage of the power mosfets? If you have a P-120 Vcore and Vi/o should be 3.3V […]
Show full quote

Voltage of the power mosfets? If you have a P-120 Vcore and Vi/o should be 3.3V

https://www.arl.wustl.edu/projects/archive/gi … X_Datasheet.pdf

http://www.dickhardtstrasse.org/Hardwarehandb … ml?cpu_486.html

This should help with pin identification.

Post pics of the board, hq if possible, for visual inspection. Here some have eagle eyes 😀

there's only one mosfet on the board, i'll check the voltages tonight. apologies for late reply, i put the computer aside for a while. but back to troubleshooting now.

Sphere478 wrote on 2024-04-03, 03:02:

Pull the cards out. Change multiplier setting to 1.5x, move ram sticks to other slots or try different sticks, unplug drive cables, re seat cpu, check power supply voltages, check cpu voltage, and clear cmos.

still beeps and won't post

did a quick google of this board, and it looks like others have issues with it too