Nick BrokI placed the corrected schematic from Scrumpel8b, this will work as expected. TSC wasn't connected what caused that the CPU goes randomly into tri-state so the program wasn't executed in the right way.
Corrected schematic diagram Scrumpel8b
A project log for Scrumpel8 an 6809 SBC
An 68B09 SBC with 16KB ROM and 32KB RAM, 8 bits I/O and 2 serial ports @ 115200 baud.
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