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Re: PC Chips M577 / Amptron PM9900 - no POST or beeping with AT PSU, will not turn on with ATX PSU

Tried another BIOS chip and no POST either. That chip contains an earlier version of the BIOS (07/11/98 S, newer one is the latest vanilla 1999 BIOS). No other devices than basic bare-bones bench setup: PSU, CPU+GPU, RAM. As for caps, I checked polarity three times for each cap changed during recap …

Re: PC Chips M577 / Amptron PM9900 - no POST or beeping with AT PSU, will not turn on with ATX PSU

zyga64 - I just placed a brand new Duracell CR2032 so CMOS isn't the issue. waterbeesje - Tried any CPU I know that was working (a quite broad range of Pentium-S CPUs, an AMD K5 PR100 and an non-MMX Cyrix 6x86) and even tested them on two other known working boards - Acorp 5VIA3P and 5VIA77. All …

PC Chips M577 / Amptron PM9900 - no POST or beeping with AT PSU, will not turn on with ATX PSU

As the title says, I recently got a PCChips M577 w/ a Cyrix MII-333GP that exhibits the following symptoms: - connecting an ATX PSU results in the board not turning on if I short the SUS-SW pins on the front panel (these act as the PW_ON pins too.) - connecting an AT PSU will result in the board …

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