Relay computers

[Tom Jennings]

On Fri, 2004-09-24 at 08:03, Paul Koning wrote:

> I think when people talk about "gates" in a logic design, it's
> normalized back to the simplest kind: 2 input gates.  So that's two
> relays. 

Well, with multi-terminal devices like relays, you get lots of outputs,
double-pole sort of "open collector". Plus, when circumstances allow it,
you can use ONE relay coil as two inputs; the two ends of the coil
winding are coil1 and coil2:


coil1	coil2
-v	-v	off
-v	+v	on
+v	-v	on
+v	+v	off

Can't do that with a transistor!