RTL Logic

From: Michael Holley <swtpc6800_at_comcast.net>
Date: Thu Jan 6 23:07:34 2005

I have acquired some Don Lancaster designs that use RTL logic and I am
looking for spare parts. The MC789 hex inverter is used in all of them and I
have 2 chips. Does anyone have a reasonable source for the MC789, I can get
all I want for $20 a chip.

I also have 2 MC799 buffers that are use in the Microlab. I have found two
each of these (MC725, MC778, MC785, MC792, MC853, MC855) that I will part

SWTPC Digital Logic Microlab
Early SWTPC keyboard

I think that Don Lancaster's TIC TAC TOE machine from 1971 is a very clever
design. It uses 5 ICs and 60 diodes to play the game. I may build one.

Michael Holley
Received on Thu Jan 06 2005 - 23:07:34 GMT

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