The Inception 8 joysticks adapter uses a joystick port for two-way communication between C64 and Inception board. Basically, a program at the C64 would send a command sequence via the joystick port, switches the port to listen and receives the Inception board's reply. In most cases, the information communicated is the state of the joysticks connected to the ...
The Workaround to Avoid the Problem
On the VIC-20, always call cputc('\r') or a routine that does a
cursor move (e.g., gotoxy(), clrscr()) before printing anything
else with conio, i.e., anything that uses cputc() to print,
including cputs() and cprintf().
Since the originial post the problem has been discussed in
cc65 issue #946 and a working (but not yet ...