Hi.?
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Have you finally checked the "good" chip on all three sockets? ?The problem might arise from a latched CE signal or the like in two of the three sockets. ?
Although the CMOS memory chips are prone to show this hi-drain behavior when faulty, I would not let the CMOS controller chips U13 U14 off the hook. ?Did you test with U13 U14 removed? ?
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?In any case, its good to have some spare memory chips. ?
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Look for the most recent issues of this type or, if you want to stick with vintage stuff, look after the "LP" versions, as there were two versions and only th LP version was meant for battery buffering. ?The "normal" version would drain your battery even faster.?
good luck?
Mondo
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Mondovermona