Depending on whether you want to maintain just the functionality or the
authenticity of your computer too, you might consider using small GALs to
replace various logic blocks in your circuit. This will impact timing,
making some signals arrive WAY earlier than they might with the OC
DTL/RTL/TTL stuff you've got now. If you've a good sense of how it's done,
you might well be able to make the timing work, however. Back when this
stuff was used, the speeds of today's GALs was unheard of for logic other
than ECL. Logic design techniques were used, which would get one fired
these days, and you never know when you're going to see some of that stuff.
If you have a problem getting a circuit, you CAN build your own in a GAL,
and make the outputs tristate and enabled from their own logic, so they
behave as OC.
Dick
----- Original Message -----
From: David Gesswein <djg_at_drs-esg.com>
To: <classiccmp_at_classiccmp.org>
Sent: Tuesday, September 05, 2000 7:29 PM
Subject: Re: Need help on old parts??
> > From: Dwight Elvey <elvey_at_hal.com>
> >
> > Hi
> > I need some pinouts for some old TTL? or DTL? parts
> > These are in my computer and I think one of them is
> > causing a failure. These are all TI parts:
> >
> > I am especially interested in the
> > SN15861 and SN15849.
> >
> If you can say you are with (or are) a company you can get the datasheets
> from http://www.freetradezone.com
>
> If you can't and haven't gotten the information email me and I will
> get it for you.
>
> David Gesswein
> http://www.pdp8.net/ -- Old computers with blinkenlights
>
>
Received on Tue Sep 05 2000 - 21:11:38 BST