Invisible <voi### [at] devnull> wrote:
> Stephen wrote:
> > Invisible <voi### [at] devnull> wrote:
> >> Stephen wrote:
> >>
> >>> Well if we are going for a P***ing contest:)

> >>> uniselector and a rotary phone dial. It could add and subtract with the output
> >>> in binary. Almost as much fun as the wine making.
> >> Um... technically that's not a stored-program computer. :-P
> >
> > I think really it was an electro mechanical abacus. It had two hard wired
> > programmes, add and subtract. :) You had to throw a switch to change the
> > operation.
>
> The word you're looking for is "calculator". ;-)
>
> And what, you couldn't throw in a few extra logic circuits to convert
> from binary to decimal? ;-)
>
> I, on the other hand, spent months designing CPU and some RAM circuits
> on my Amiga 1200 using DPaint IV AGA. I'm not really sure if it would
> ever have worked, but (without the RAM) would have required roughly 200
> chips. (7400, A.K.A. TTL quad 2-input NAND.)
>
> I tried to restart that effort using KLogic - but it crashes too much.


Tobor the Robot :)

binary to decimal converter using only relay logic?
Ah! TTL, I built a digital clock out of TTL but did not put it together when I
checked the current. The PSU would have needed to supply 100 amps at 5 volts

could run on a PP3 battery.


Stephen

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