RTL Logic

From: Cini, Richard <RCini_at_congressfinancial.com>
Date: Fri Jan 7 07:41:47 2005

OK, this might sound like a stupid question, but being somewhat ignorant of
RTL logic in comparison to TTL and other designs, what, if anything, can be
substituted for RTL logic chips?

For example, if I wanted to build one of Don's devices and I wasn't
concerned with using "vintage" chips, could I do it "plug-and-play" using
current TTL?


-----Original Message-----
From: cctalk-bounces_at_classiccmp.org
[mailto:cctalk-bounces_at_classiccmp.org]On Behalf Of Michael Holley
Sent: Friday, January 07, 2005 12:08 AM
To: cctalk_at_classiccmp.org
Subject: RTL Logic

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 Fri Jan 07 2005 - 07:41:47 GMT

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