> I am building a digital clock with Nixie tube display for a friend and we
> have decided that we will not use any components which were not available
> in 1978 (the year we started work together, me as a hardware designer, he=
r
> as a software engineer)
>
> My problem is that i cannot remember what CMOS chips were available 40
> years ago.  I am fairly sure that the CD4000 series was established by
> then
> but cannot remember if the Texax HC74 series had been released.
>
> Anybody got a really good memory or, even better, old data books?

I remember the CD4000 series and 74C series around the same time. I think
National did the 74C, while Motorola did CD4000. I used to have a GIANT
Motorola integrated circuit book. Really thick book with thin pages. The
HC series came later, but I don't remember how much later. The CD4000 and
74C operated over a wide voltage range (something like 3V to 15V, while
the 74HC only operated up to 5V --- from memory).

There WERE clock chips in 1978. Here's a design I did in 1977:
http://bh.hallikainen.org//wiki/uploads/HaroldHallikainen/20130416125339_Pa=
rt7.pdf

Harold




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