Old NEC CPU date code deciphering?

[ce]

Anybody here an expert on NEC date codes? I have D80C35C micro's with codes of K17076-131 and K18816-132.

Thanks!
-Cole

[Neon_WA]

these may help you
http://www.datamath.org/Datecodes.htm
http://www.edaboard.co.uk/japanese-date-codes-t345869.html

With Japanese ICs sometimes the only way to work this out is by looking at used ones on boards and checking the standard date format chips

[ce]

Thanks, Neon! Very interesting, esp. data codes based on Hirohito's coronation year, which seems to be the case for these chips!


-Cole