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(a)drs-esg.com> To: <classiccmp(a)classiccmp.org> Sent: Tuesday, September 05, 2000 7:29 PM Subject: Re: Need help on old parts??