Forgotten PC History

Roy J. Tellason rtellason at
Mon Aug 11 22:13:56 CDT 2008

On Sunday 10 August 2008 04:53, Eric Smith wrote:
> 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.

I think I may even have a NEC databook that features some of those,  and 
remember how odd it was that those seemed to me at the time.  Probably 
somewhere around 1978,  maybe?

Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space,  a critter that can
be killed but can't be tamed.  --Robert A. Heinlein, "The Puppet Masters"
Information is more dangerous than cannon to a society ruled by lies. --James 
M Dakin

More information about the cctech mailing list