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PC Chips M912 ver:1.7 green pcb black isa [ UPDATE IMPORTANT!]

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Reply 80 of 85, by Nexxen

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Red wires are straight traces and those are correct.
White follows a trace that was like that before removing fake chips.

PC#1 Pentium 233 MMX - 98SE
PC#2 PIII-1Ghz - 98SE/W2K

Reply 81 of 85, by Nexxen

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-

PC#1 Pentium 233 MMX - 98SE
PC#2 PIII-1Ghz - 98SE/W2K

Reply 82 of 85, by Nexxen

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After soldering a defective joint, cache is now detected.
I have to put TAG ram to 8+0 bits, if 7+1 it won't work with stock bios.
Write back or through works.

Using Phil's boot menu cache check:
extended memory: cacheck loads fast and detects L1 + L2
expanded: uber slow loading + cpu is in V86 mode warning and detects L1 + L2
conventional: says mb #x or y or z looks not cached error

I get mb no. not cached, don't get why tho.

Last edited by Nexxen on 2021-05-17, 17:16. Edited 1 time in total.

PC#1 Pentium 233 MMX - 98SE
PC#2 PIII-1Ghz - 98SE/W2K

Reply 83 of 85, by Nexxen

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The performance bump is noticeable.
Quake benches almost doubled at any resolution, and others too.

Tried with 1995X bios chip. Tomorrow I'll try with the one it came from.

PC#1 Pentium 233 MMX - 98SE
PC#2 PIII-1Ghz - 98SE/W2K

Reply 84 of 85, by Nexxen

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BIOS 1995X is so far the best to provide performance.

I suspect 1995D to have some hardcoded settings that prime some aspects in ram performance rather than the whole system of L1+L2+Ram.

In WT mode for cache they are on par as long as you don't fiddle with other parameters, as 1995D won't allow those and you'll end up with a slower system.

Cpus I tried can't work in WB, no idea why but L1 WB or WT give the same results.

Went so far and that's it. I'll post a few speedsys and cachechk pics.

Bottom line: if you have this model with fake chip, if pins go to ram and chipset most probably it'll work with real L2.
Update to 1995X BIOS version.
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PC#1 Pentium 233 MMX - 98SE
PC#2 PIII-1Ghz - 98SE/W2K

Reply 85 of 85, by Nexxen

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IBM 5x86 100 mhz is a nice upgrade.

PC#1 Pentium 233 MMX - 98SE
PC#2 PIII-1Ghz - 98SE/W2K