Hi Phil,"phil" <pjwylie@gmail.com> wrote in message ace9e1a4-caf8-435a-920b-b0d23eb05e34@v6g2000prd.googlegroups.com">news:ace9e1a4-caf8-435a-920b-b0d23eb05e34@v6g2000prd.googlegroups.com...
Well, I was just guessing about the RAM. Do you think it might be the CPU? With modern machines bad CPU usually means no display, but Apple broke all the rules with the Apple // I guess. Thanks for pointing me to futurlec for RAM...
The pattern you described ( @'s and solid blocks) is not unusual to see briefly before the machine resets and clears the screen memory. If you can see some activity on the 65C02's clock input, then check to see if :1. The *RESET line is low/high. Stuck low will keep the machine in a perpetual reset cycle.
2. Look for pulse activity on the CPU data lines, followed by Address lines. Where are you by the way? Cheers, Red