On Wed, 6 Mar 2002, Ethan Dicks wrote:
> --- William Donzelli <aw288_at_osfn.org> wrote:
> > > I was just reading a bit on TTL while looking for something else.
> > > In 1965 a 7400 gate was $20 and Candy bars 5 cents.
> >
> > Probably not 7400 series (earliest 7400 series I have are from late
> > 1968).
>
> I _think_ I have some 7400-series chips from 1967, but no earlier. They'd
> be in a PDP-8/L if, in fact, I am remembering correctly.
>
> > There were a number of logic families that were out in the mid-1960s.
>
> Indeed... I am looking for some (and not expecting to find any) to
> build a replica of a DW08, DEC's pre-TTL TTY interface made from W-series
> and R-series logic. The W706 and W707 boards use a Motorola logic family
> with 3 digits, not 4. The schematic for the W707 transmitter shows...
>
> 1 x MC799P "Dual Power Buffer" ('P' for Plastic package, 0C - 70C rated)
> 8 x MC724P "Dual J-K Flip- Flop"
> 5 x MC724P "Quad Input Gate" (NAND)
> 5 x MC789P "Hex Inverter"
>
> GND is on pin 4, Vcc is shown to be +3.6 VDC on pin 11. The schematic also
> suggests that they are 14-pin ICs, but no way of telling if they are DIP or
> some other packaging (but the mention of a plastic package is a hint).
They are 14 pin DIPs in shiny black epoxy. RTL I believe.
>
> I have to say that I have been previously unaware of any logic family that
> used +3.6V for Vcc. Anyone have any info from 35 years ago?
Fairchild RTL uLogic (914 dual 2 IP NOR, 923 JK FF,913 D FF etc (memory
failing...) -- all 8 pin TO5 cans or epoxy equiv...
also use 3.6 V
>
> > Yes, in 1965 I can believe $20 per chip!
> >
> > And then, ten years later, 19 cents per chip...
>
> Thank you, Gordon Moore.
>
> -ethan
>
>
>
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Peter Wallace
Received on Wed Mar 06 2002 - 16:13:52 GMT