feipoa wrote on 2025-01-17, 01:02:

It has been too long since I was testing the Parhelia 256, but I ran into problems on both variants of the ServerWorks chipset - some issue with the PCI bridge. The details are hopefully in my old thread here: Matrox Parhelia 256 PCI-X Performance

Well my board is ServerWorks Serverset III LE and it originally had problems with the PCI bridge not being able to assign proper resources as they were being assigned to something else. I think I had to turn PCI Bus mastering off in the bios so Win2k could do it. I know originally it wouldnt install the drivers in the PCI64 slots only the PCI32 slots but the I got it to install (fresh install) in the PCI64 slots correctly and it was some setting in the bios.

I just went downstairs and it worked with PCI Bus mastering on and off in the bios so not really sure.

On my Intel SAI2 (ServerWorks III LE), the Parhelia 256 PCI didn't work in any slot. Even when I thought it was working, it had some sluggish 2D issues with the GUI.

Cant say I ever really had any AGP problems with the ServerWorks HE-SL chipset.

But I dont game on it.

VooDooMan wrote on 2025-01-16, 13:36:

This volt mod is very simple and works well with all Pentium III Tualatins. I haven't tried with Celerons though ;)
By connecting those two wires you gonna raise the voltage from 1,45 to 1,65.

VooDooMan: Do you have a chart which shows which pin bridges lead to what voltage increases on a Tualatin?

feipoa wrote on 2025-01-19, 05:31:

VooDooMan wrote on 2025-01-16, 13:36:

This volt mod is very simple and works well with all Pentium III Tualatins. I haven't tried with Celerons though 😉
By connecting those two wires you gonna raise the voltage from 1,45 to 1,65.

VooDooMan: Do you have a chart which shows which pin bridges lead to what voltage increases on a Tualatin?

No, this is the only modification I know....

But if you study this a little bit you can learn more 😀
https://theretroweb.com/misc/documentation/24 … de769755306.pdf

feipoa wrote on 2025-01-19, 05:31:

VooDooMan: Do you have a chart which shows which pin bridges lead to what voltage increases on a Tualatin[/b]?

This article deals with some options and limitations:
http://www.geocities.ws/_lunchbox/vid_mod.html

Thanks. On that chart, looks like:

0 = short the pin to GND
1 = leave N/C or pull-up (3.3 V max).

But won't the BIOS overwrite the values manually set with wire bridges? Is that why we're setting specifically the default value? This would take some thought and playing around.

If anyone has some photos of what bridges will set what default values, that would be helpful. I'm afraid this is pretty far down on my hobby to-do list.

I think that with the default voltage 1.45v of the SL6BY the only useful simple bridge mod is the one that produces 1.65v.
The rest needs, so it seems to me, a combination of bridge + isolation?