I have tried to use the 2nd serial interface of the C166 I ve modified the hello-Program and created my own putchar.c but there is still no output in the 2nd serial window.
Check your port DDR registers for correct initialisation Check also if the port is set into 'alternative' mode. If possible check with a scope for the baudrate, etc... Best Regards Paul
80C166 simulation is new in C166 V4.12. In this version all SFR including the 2nd serial interface are correctly simulated.