The project is still my lasergame equipment.

When the "body" module is powered up, it will send 70 bytes to the PC (scores).
It will not have the time to heat too much do you think I still can use internal OSC at 8MHz, without a MAX232, with serout, N9600, a 1k inline resistor between pic RA5 and PC pin 2? Redesigning the project is unfortunately almost impossible now.