TTL 7400's Available

[William Donzelli]

> Ok, tell us more about these things. A web search tells little. All I
> see is something about non-linear magnetic core, f/2 and phase.
> I don't see how it is used to create a logical operation.

All my (very few) documents (yes, Al), are in Japanese.

>From what I see, it looks like each logic block is a majority gate
with inputs feeding the core. With an odd number of inputs (required
with majority gates), and sine signals of either phase applied (0
degrees is zero, and 180 degrees is one, for example) to the inputs,
the phase in the majority saturates the core, and is fed out to the
amplifier (12AX7s, in this case) to be normalized. At least I think
that is how they work.

The more important thing about this logic trainer, and the NEAC, is
that it shows us Westerners that the Japanese were indeed able to make
quality goods in the late 1950s.

--
Will