[BBC-Micro] Grrr.....annoying master cmos ram

[BRAHMS]

I've recently replaced the batteries on my master's CMOS ram but it still fails fairly regularly (quite often with "Bad Sum" messages on Break/CTRL Break and lots of *TIME oddities)

Does the actual CMOS ram often fail? If so is it easy to replace.  Would anyone have the correct chips to hand?

Cheers

Dom
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