I am happy to say that an "Apple 1" was born tonight. I spent the last week troubleshooting. Many thanks to Corey for graciously letting me bounce questions off him. As it turns out Unicorn supplied a DS0026 in my parts kit. Corey pointed me to a bunch of references dealing with the 0026 Vs the 0025. After contacting Unicorn on Friday Rob quickly shipped out an order I placed for a DS0025. I got it today. Once the chip was installed I still had a problem, but I had eliminated the possibility of the 0026 making the rails too noisy.
I think the thing that helped was understanding the actual circuitry. SB-Projects was a great resource, thanks San!) Once I could tell that the shift registers weren’t clearing it pointed to the clock driver again. It may have very well ran on an 0026, but I never tested with it once I got my 0025. Once the 0025 was in I scoped the actual two phase clock. One “leg” wasn’t hitting all the way down to the negative rail. After a while of making sure the inputs were equal to the clock driver I assumed that I may have had a 2504 loading down the clock. So I pulled three of the 2504’s and the clock signal looked good on the scope with both legs hitting the rail. I put the pulled chips back in one at a time until I found the bad chip. luckily I had bought a complete set of spares from Unicorn. Plopped one in, when I tested the clear screen everything worked perfectly.
As part of my trouble shooting I had swapped out a lot of the TTL with newer IC's. Interestingly enough when I went back and repopulated the older TTL the screen clears and the computer runs. (The character set print routine). Although the computer terminal boots with random characters in the shift registers, not the uniform @_ character filled screen.
I'd also like to thanks Mike W. and many others who I have gained a lot of knowledge from to help me get this done.