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P3 Coppermine no POST below 1.8V on slot 1 mainboard. But the voltage is there.

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First post, by adalbert

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//update Re: CPU voltage reg. chip upgrade (slot 1) to support P3

I have KM6ZMS Slot 1 440ZX mainboard. It uses HIP6018 voltage reg chip which goes only down to 1.8V. It supports only P2 and P3 Katmai out of the box, but I managed to get Coopermine running by masking two VID pins and connecting one to GND, so it runs on 1.8V instead of 1.65V.

Overvolted Coppermine works, but the power consumption is almost as high as Katmai because of increased voltage. I want to achieve maximum power efficiency, because i'm using pico PSU which has very limited 5V rail.

HIP6016 looks pin-compatible to HIP6018 and goes down to 1.3V. Can I just replace that chip and expect the mobo to work with lower voltage Coppermines? Has anyone done such swap?

I also found this in documenation: Given the pin-to-pin compatibility to HIP6018, the HIP6016 can be evaluated in a HIP6018EVAL1 evaluation board

//edit: http://www.cheertech.com.tw/RichTek%20CD/Docs/DS9228-04.pdf
http://www.cheertech.com.tw/RichTek%20CD/Docs … DS9227A-03P.pdf
RT9228 and RT9227A also have the same pinout and Coppermine voltage capability. Are these chips interchangable in general?

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Last edited by adalbert on 2021-01-25, 15:35. Edited 1 time in total.

Repair/electronic stuff videos: https://www.youtube.com/c/adalbertfix
ISA Wi-fi + USB in T3200SXC: https://www.youtube.com/watch?v=WX30t3lYezs
GUI programming for Windows 3.11 (the easy way): https://www.youtube.com/watch?v=d6L272OApVg

Reply 1 of 4, by PARKE

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No idea if these chips are interchangeable but the best shot for you seems to be(?) the 6018 B version:

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Reply 2 of 4, by adalbert

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Oh, thanks for noticing that. I didn't see that this chip had another revision, so I will order it and try 😀

Repair/electronic stuff videos: https://www.youtube.com/c/adalbertfix
ISA Wi-fi + USB in T3200SXC: https://www.youtube.com/watch?v=WX30t3lYezs
GUI programming for Windows 3.11 (the easy way): https://www.youtube.com/watch?v=d6L272OApVg

Reply 4 of 4, by adalbert

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Okay, seems that I didn't pay too much attention to check everything properly and it looks like I have chip capable of Coppermine voltages here. It has BCB marking.

I just covered another connector on CPU to force 1.7V voltage. And there indeed is 1.7V measured on mosfet. But i get only blank screen. And i have 00 post code on diagnostic card. It doesn't show any numbers, just stays on 00.
Can it be related to BIOS support and microcodes? Or is there anything else I should check?

Repair/electronic stuff videos: https://www.youtube.com/c/adalbertfix
ISA Wi-fi + USB in T3200SXC: https://www.youtube.com/watch?v=WX30t3lYezs
GUI programming for Windows 3.11 (the easy way): https://www.youtube.com/watch?v=d6L272OApVg

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