Hi, everyone. I'm looking for any information on the datasheet or a BIOS patch for the Tyan S1837UN motherboard. As mentioned earlier, Steve Foster was able to create a 1/4 divider patch for this motherboard, but unfortunately, the datasheet for the Cypress (IC-Works) W177H PLL is currently unavailable online. However, it definitely supports a 1/4 divider; the manufacturer did not include this feature in the BIOS, so all modes currently run with a 1/3 divider.

Motherboard:
https://theretroweb.com/motherboards/s/tyan-s … 7un-thunderbolt
Article:
https://www.overclockers.com/steve-fosters-wa … ual-cpu-system/

I've managed to add support for Tualatin processors on this motherboard. The CPU Cool feature also has a preset for this PLL, but it doesn't work correctly: when set to 133/33 or higher, it simply freezes, and when set to lower modes, I don't see any effect on the system when using CPU-Z or other programs.