3.6v? Are you joking or do you believe that? Way back when I worked a
little with RTL and always used 5v. On the other hand CMOS might work in
many cases.
Randy
----- Original Message -----
From: "Dwight K. Elvey" <dwight.elvey_at_amd.com>
To: <cctalk_at_classiccmp.org>
Sent: Friday, January 07, 2005 11:19 AM
Subject: RE: RTL Logic
> Hi
> RTL is 3.6V. You could get by with CMOS but
> not TTL, directly. Of course, you could run two
> power rails. The signal levels of RTL and TTL are
> somewhat compatable.
> Dwight
>
>>From: "Cini, Richard" <RCini_at_congressfinancial.com>
>>
>>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?
>>
>>Rich
>>
>>-----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
>>with.
>>
>>SWTPC Digital Logic Microlab
>>http://www.swtpc.com/mholley/PopularElectronics/Apr1970/PE_Apr1970.htm
>>Early SWTPC keyboard
>>http://www.swtpc.com/mholley/PopularElectronics/Apr1974/PE_Apr1974.htm
>>
>>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.
>>http://www.swtpc.com/mholley/RadioElectronics/Dec1971/RE_Dec1971.htm
>>
>>Michael Holley
>>www.swtpc.com/mholley
>>
>>
>
>
>
>
>
Received on Fri Jan 07 2005 - 11:37:46 GMT