Lisa's scores

Well, there's the AMD 2900-series data book if you can still find a copy. There's enough info in there if you already know how to design a microcoded system to make one using the 2901's, etc. I suppose a good technical manual on a machine that used them would be a good starting point as well. Be warned that you need a lot more than the 2901's. They're just the ALU and registers. You also need some kind of control store sequencer (AMD would like to you use the 2909, 2910 or 2911), a microprogram (either stored in ROM or RAM) and a lot of glue logic. I suppose you _could_ go for a hardwired instruction decode, but you still need a sequenncer for your machine code program What I would love to see are the Application Notes for the 2900 series. I am told there's some fun stuff in some of them - Unibus SMD controllers etc. -- -tony ard12(a)eng.cam.ac.uk The gates in my computer are AND,OR and NOT, not Bill