29 Nov
2009
29 Nov
'09
3:19 p.m.
On Nov 29, 2009, at 6:14 PM, Fred Cisin wrote:
Only for Busicom. ;)
-Dave
--
Dave McGuire
Port Charlotte, FL
A number of
early Japanese calcs were made from a logic
combination of SSI IC
NOR gates and discrete-diode AND gates to make AND-NOR logic.
Quite flexible in
that the AND gates could have as many inputs as needed, canonical
state
machines were easy. The calcs are packed with hundreds of diodes
and a few ICs.
Some other early IC calcs used only half-a-dozen-or-so IC types;
2,3,4-in gates
and dual-FF for example.
Would that be a suitable use for something like a 4004? :-)