daver2
10k Member
I was thinking the same thing...
Dave
Dave
...although I'm a little worried about the floating inputs on U12B, maybe he forgot to finish the diagram. They should at least have had tie resistors on those pins. With that sort of thing, it may not be viable to build it as the documentation is questionable.
Do you have more details on it and the schematic ?I found my box: Black box, 232-488. I googled on this and it is easy to find. Except, I have a different layout on the the front and a different power switch on the back.
Presumably this is the document:Aren't there circuits in the 'seminal' PET IEE488 book for these types of interfaces?
Dave
I'll look around but don't hold your breathWow, thanks, I didn't know the ADA1800 existed. It may well even be rarer than the ADA1450. It turns out it has been reverse engineered, I found the schematic on zimmers ( Attached). I could make that very easily.
Would you happen to know if the user manual is around for this one , DIP settings etc ?
Since the ADA1800 is all discrete logic, it would be good to have an accurate schematic. Can you look inside it and find out where pins 3, 4 & 5 of U12 B connect ?I'll look around but don't hold your breath
I do have an ADA1800 though.
Yes, a classic bowtie flip-flop.U5C and U5D are the 'listen' S/R flip-flop.
U7 is the 'listen' decoder.
U9 is the 'unlisten' decoder.
I agree.>>> Yes, a classic bowtie flip-flop.
Just not drawn classically!
Dave
U5C and U5D are the 'listen' S/R flip-flop.