hi again
After a long night of switching RAM chips running PET RAM TEST program and so on, It turned out to be a another defective RAM chip in UA16.
This faulty chip did not prevent the pet from startup but having issus runing certain bigger programs for exemple space invaders works fine with the bad RAM chip.
I replaced the bad RAM chip and it seems to have no more errors i will let run the test till cycle 99999 but this will take a lot of time. Anyway it has passed the bad point several times.
I contacted Bo Zimmerman about the U1 return, he never run the program but suggest a bad ram chip and says the program need to be run on the right computer. But the only information i was able to obtain is that the program is for the pet, but witch edtion i can not tell.
Any way it helped me catching another issue on my long way to get this pet back to life
Regarding the memory dump with the petvet it still returns garbage in BYPASS mode. I'm still waiting on mike replying to my mails
Regarding the modifications (brown wires) on the motherboard still need help to indentify them on shematics.
Kind regards, techtatan
After a long night of switching RAM chips running PET RAM TEST program and so on, It turned out to be a another defective RAM chip in UA16.
This faulty chip did not prevent the pet from startup but having issus runing certain bigger programs for exemple space invaders works fine with the bad RAM chip.
I replaced the bad RAM chip and it seems to have no more errors i will let run the test till cycle 99999 but this will take a lot of time. Anyway it has passed the bad point several times.
I contacted Bo Zimmerman about the U1 return, he never run the program but suggest a bad ram chip and says the program need to be run on the right computer. But the only information i was able to obtain is that the program is for the pet, but witch edtion i can not tell.
Any way it helped me catching another issue on my long way to get this pet back to life
Regarding the memory dump with the petvet it still returns garbage in BYPASS mode. I'm still waiting on mike replying to my mails
Regarding the modifications (brown wires) on the motherboard still need help to indentify them on shematics.
Kind regards, techtatan