On 4/17/2013 11:17 AM, barrym95838 wrote:
http://www.willegal.net/appleii/appleii-repair.htmNice link, schmidtd; that's just the kind of thing that I was starting to look for, to help Danilo get his Apple out of its coma!
I'm currently going through the same thing with two comatose boards: they are US rev 3 and rev7 boards. I'm working on the rev 3 now. Since I have no digital tools, I am down to thinking and swapping. So far I have done full-board chip swaps with a known-good rev 3 board (one row at a time, including CPU), and I replaced all 3904 transistors. I consistently get a typical memory pattern display on power-up, so at this point I'm still suspecting lack of reset-ability. (The keyboard reset key does not in fact reset it.)