If the tests are done correctly then it is a good chance that U2 or U3 is bad. Also try it with the game prom removed. and test the IRQ then to ensure this is not dragging it down.
I will do this now and report back. I think between me learning how the logic probe works and my nice new shiny DMM I believe I've done everything right as per Clay's guide.
I've emailed Ed again - asking very very nicely if he has a QuickScan tucked away somewhere (shop listed sold out) of his QuickScan's....Just in case I get a HH or another Sys80 type game...Plus probably handy for someone locally to have one in case others get into trouble!
I was going to buy one just for that very reason. I have several system80s in the pipeline and I wanted to have a Quickscan handy for others that may run into problems in the future.
Let me know how you go - I might want one as well Marty.
Ed emailed me back. No luck. He is well and truely out of stock with the boards. He is hoping to start production again but no time frame unfortunately.
