VOGONS


IBM PS/1 upgrade project

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Reply 20 of 22, by OVERK|LL

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Oh, tried the FSB at 40Mhz, it was not stable (and the ODP got surprisingly hot), so we are back at 33Mhz.

DD: Mac Pro 5,1 - X5690, 64GB, RX 580 - OCLP w/Sequoia
Projects:
- Hewitt-Rand 8088 - 640KB, 20MB, Hercules mono
- IBM PS/1 2133 w/Thermalwrong solder mod - ODP 486DX4-100, 32MB
- PCPartner VIB806DS w/233MMX, 128MB, G450
- Jetway J-TX98B w/P75, 256MB

Reply 21 of 22, by SSTV2

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OVERK|LL wrote on 2025-02-10, 01:06:

I did not unfortunately. I got the ZIP40's on E-bay for next to nothing, so it was a no brainer to get High Colour.

Dang, those SOJ40 ICs are very common, maybe I'll just make a SOJ40->4xZIP20 interposer module when I get bored enough one day.

You should try tweaking RAM timings instead, performance gains from it alone should be similar to the 120MHz overclock w/o tweaks.

Reply 22 of 22, by OVERK|LL

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SSTV2 wrote on 2025-02-10, 18:18:
OVERK|LL wrote on 2025-02-10, 01:06:

I did not unfortunately. I got the ZIP40's on E-bay for next to nothing, so it was a no brainer to get High Colour.

Dang, those SOJ40 ICs are very common, maybe I'll just make a SOJ40->4xZIP20 interposer module when I get bored enough one day.

You should try tweaking RAM timings instead, performance gains from it alone should be similar to the 120MHz overclock w/o tweaks.

Yes, will probably play around with that once I'm done messing with XT-IDE.

DD: Mac Pro 5,1 - X5690, 64GB, RX 580 - OCLP w/Sequoia
Projects:
- Hewitt-Rand 8088 - 640KB, 20MB, Hercules mono
- IBM PS/1 2133 w/Thermalwrong solder mod - ODP 486DX4-100, 32MB
- PCPartner VIB806DS w/233MMX, 128MB, G450
- Jetway J-TX98B w/P75, 256MB