Or take the oposite road .............
Build your DTL-gates from discrete components
Few diodes a few resistors and een less small signal
transistors.
I''ve posted the basic diagram on my sit
http://xgistor.ath.cx/files/
Sipke
----- Original Message -----
From: Richard Erlacher <richard_at_idcomm.com>
To: <classiccmp_at_classiccmp.org>
Sent: Wednesday, September 06, 2000 4:11 AM
Subject: Re: Need help on old parts??
> 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 Wed Sep 06 2000 - 03:01:05 BST