4004 and IC history / clock stuff

[Steven Canning]

> > > The only 8-pin TTL chips I (just) rememebr the 7456 ands 7457 (I
think)
> > > which were /50 and /60 counters (desigend to get 1Hz clocks from
Europe=
>
> > And speaking of 50 and 60 Hz,  I have this digital clock here that I
got=20
> > *real* cheap,  because it has a problem.  it gains a LOT of time every
ho=
> > ur. =20
> > Something like 10 minutes,  maybe?  I'm convinced that it's jumpered
(or=20
> > something) for 50 Hz line power.  :-)
>
> If it was, it would add 72 minutes instead of 60 ever hour, I think. So
> it would gain 12 minutes per hour. Sounds just like your problem.
>
> Most LSI digital clock chips could be jumpered for 50Hz or 60Hz input.
> SOme earely ones seem to have been 60Hz only (I've not seen one that's
> 50Hz only, but that may be because most of the books I've read on this
> originiated in the States).
>
> -tony

When I need / needed  50 / 60 Hz I use / used  a Mostek 5009 ( 16 pins ).
Yes I have a  datasheet. I think I have a couple parts in my Mostek dark
archives...

Best regards, Steven C