Oops!
I forgot one thing. You can put several RTL outputs in
parallel as a wired AND. You can't do that with the
general CMOS or TTL. You'd need to look out for this.
Does anyone have a source for DTL parts. There are
a could I've been looking for.
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 - 11:22:00 GMT