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32-bit acorn hardware • Re: A540 Repair... almost. was working, now CMOS problems.

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Thank you for the advise and sorry about all the worrying.

Thats how I intepreted the difference between "CMOS unreadable" and "CMOS checksum fail". Thank you for confirming.

I've checked connectivity and values of the I2C pullups R2 and R3 and I believe that is all correct.

I managed to get a trace of the I2C bus but I'm still working on the decode function. Its a new scope to me. Its a PC USB one and the software isn't great.

I'll keep at it trying a the decode function but at the moment I haven't noticed any difference between the results with the CMOS chip in-place or when it is not.
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Statistics: Posted by Pullance — Wed Mar 06, 2024 2:42 pm



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