falter
Veteran Member
Thanks Marty... I think I agree. Although I'm surprised the OS wouldn't fit into the base system RAM config. IIRC the manual calls on you to load it with just the three boards. Anyway, I'm going to keep testing RAMs the only way I can for the moment. As it turned out, there were some bum RAMs on the CPU board, if my testing regime is correct. I started taking RAMs off the CPU board, putting them on video and then putting 'known good' back into the CPU.. three 2102s off the CPU board generated bad video.. so I guess they were not good. For kicks, I tried loading the OS again. It breaks down at exactly the same place, however this time instead of stopping before it hits 7s, it clears the screen and dumps a whole bunch of random characters and continues to as the tape runs.
Anyway, with the jumper settings better understood now I'm aiming to get enough known good 2102s to fire up 'BD 0' (as the previous owner labelled it) up.. we'll shoot for a 10K system (I guess that's what it is.. 2K+8K), and then if that works, see if we can work our way to an 18K. The third board obviously will be impossible unless I acquire more 2102s.
Anyway, with the jumper settings better understood now I'm aiming to get enough known good 2102s to fire up 'BD 0' (as the previous owner labelled it) up.. we'll shoot for a 10K system (I guess that's what it is.. 2K+8K), and then if that works, see if we can work our way to an 18K. The third board obviously will be impossible unless I acquire more 2102s.