Hello, does anyone have the bios dump dated 16/12/1993 ? I saw it can handle HDD larger than 528MB.

does anyone have the bios dump dated 16/12/1993 ? I saw it can handle more than 528Mb HDD.

Yes, finally my kingston turbochip on IBM PS/1 see 160Mhz!!! Kid's dream!!! Thanks epictronics, Thermalwrong Oh thats great!! i will love to have a 486/5x86 +100mhz in my IBM, but i dont find interposer in any place to buy, and overclock my DX4-75 to more than 100mhz i think will not work for sure. …

Yes, finally my kingston turbochip on IBM PS/1 see 160Mhz!!! Kid's dream!!! Thanks epictronics, Thermalwrong

According to datasheet 60Mhz configuration was 88Mhz before E revision. It might be interesting.

I confirm. In my PS1-2133 571 R174 and R175 are populated, R176 not. So, I can achieve 40Mhz, wow!

I have a 2144-911 and FSB works as follow J35 open J36 open J37 open -> 20Mhz J35 open J36 open J37 on -> 25Mhz J35 on J36 on J37 on -> 33Mhz J35 open J36 on J37 on -> 40Mhz

mael_b wrote on 2022-03-13, 11:14: Have you tried to put a DX4 on it ? I have the 2144-914 and I try to upgrade to an AMD DX4 100MHz and I have issue... I have a 2144-911 and Amd 486 DX4- 100SV8B works fine with DX2 or DX4 settings and JP10 jumper open. (BIOS version B02UK0S date 09/27/95)

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I have tested my PS1 2133-571 with several CPU, original IBM DX-33, Intel DX2-66, AMD Am486 DX4-100SV8B (5V tolerant but very instable with a heatsink), Kingston TurboChip tc5x86/133 and finally a Pentium Overdrive PODP5V63 that doesn't boot (CPU not working or just FSB problem ?). I hope to find a …

I have a PS1 2133-571 with a kingston turbochip. My bios dated 09/01/93 can handle HDD only under 528MB so I installed EZ-Drive to support a 2GB CF. Okay, I have installed the Intel 486dx4-100 Overdrive CPU and IBM 730mb hard-drive. And all is working fine. I am still waiting for the RAM to arrive. …