Diagnostic reports control port bad. about sidkick-pico HOT 1 CLOSED

I think I know why it reports "bad" (although it isn't :-)). The harness uses a resistor to simulate a paddle at a fixed position. The way how the (minimalistic) level shifting on the SKpico works results in a reported potentiometer value that is a bit smaller than with an original SID (in mouse or paddle operation that does not matter). As the diagnostic code tests for the value to be within a certain range, it reports an error. Changing the resistor value or the diagnostic ROM would be one option, the other might be revision 2 of the hardware and firmware ;-) (but no promises that this particular issue will be addressed (immediately))

from sidkick-pico.