MOS MCS2529 math chip

Jules Richardson jules.richardson99 at
Fri Jul 20 12:18:15 CDT 2018

Anyone got pinout/spec information for a MOS MCS2529? In particular, I'm 
curious about operating voltage. I acquired a Melcor SC-635 calculator 
yesterday and there seems to be some uncertainty about the output voltage 
of its (rechargeable) battery pack; some places say 2.4V, i.e. the pack is 
a pair of 1.2V cells, but others say 9V.

2.4V seems a little low to me for typical logic, but on the other hand I've 
seen a period ad which says that the external PSU was 9V - and so the 
rechargeable battery must have been somewhat less than that.



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