Thank you Allison for your explanation and patience.
I turn on the CPU Card+SIO+FP combination, wait for loading from SD with message FL 0030
Then F+E soft reset to stop PC from moving, I think it is executing CP/M
Click on "9" to set RAM bank to 0 "RAM 0"
Set PC to 0000
Set BC to 0000
Enter program (example from the manual) into 0000 (3C C2 00 80 03 C3 00 80)
Verify PC and BC are 0000
Then press 4 "go" to execute the program from RAM address 0000 SIO Bank 0
It crashes with HARD 01
Same steps when entered into 8000 works fine, I can see BC is counting up.
What am I doing wrong? Does this mean I cannot run a program from SIO RAM Bank?
Thank you,
Kerem
Kerem Kapkin