Tandy Logix-Kosmos (was: Re: Ferranti Logical Computor (1951) )

Brian L. Stuart blstuart at bellsouth.net
Sun Oct 21 19:43:12 CDT 2007

> > http://oldcomputermuseum.com/logix_kosmos.html
> That was the first one I had - the overlays inside were, IIRC, printed
> tissue paper.

Me too.  I still remember how I would forget that they were not
symmetric, so if you put them in backwards the separators between
the output values and the plastic separators between the  lights
don't line up.

> >         Mine died of corrosion on the contacts, and was (regrettably)
> > trashed, I'm pretty sure.
> I remember the contacts weren't great on the best of days.  I think my
> step-mother threw mine out when she decided my room was too messy.
> :-(

Yeah.  The contacts were my biggest source of frustration.  I probably
would have done a lot more with it, if I hadn't had to wiggle wires
and adjust the contacts for every "program" on it.

Believe it or not, I still have mine.  I even have it upstairs where
I can find it.  Not that I've used it any time recently.

> My only real complaint with it as a teaching tool was that even though
> I did all the projects, there was no abstraction of the underlying
> concepts presented.

I agree.  They also didn't do a good job of clarifying that the
device only implemented combinatorial logic.  As I recall, I got
it before the idea of a stored program really clicked with me.
Unless I missed it, they didn't have a discussion in the manual
that said, this "computer" does this, but real computers also
have memory that stores not only data, but instructions too.


More information about the cctech mailing list