10 Aug
2008
10 Aug
'08
1:53 a.m.
Philip Belben wrote:
I have a couple of Sharp calculators from about that
date. I just
grabbed the nearest (an ELSI-160) and opened it up, to find that the
four chips have date codes in early 1971 and forty-two (yes, 42) pins
each in a dual zigzag arrangement.
42-pin DIP packages were common among Japanese semiconductor vendors but
I don't recall seeing any from US vendors.
For example, the early NEC cassette/cartridge tape controller chip,
uPD371 was in a 42-pin DIP. I think their single-density floppy
controller chip, uPD372, might also have been in a 42-pin DIP.
Eric