KatTech70

I removed the surface mounted PIC chip with a hot air re-work station. Here are my steps: De-soldered the ICSP header. Shielded the adjacent ICs with Kaowool and secured with Kapton tape. Pre-heated board to 180C for two minutes Heated the chip leads to 320C and removed chip with tweezers. Replaced the ICSP header.

Hello All! I’m a friend of MissCommand. I have been reviewing this issue with her. A quick warning. Do Not turn on DIP switches 1 and 2 at the same time. This causes a short between +5V and GND. Bad things could happen. In the current circuit layout, instead of disconnecting power, I recommend disconnecting the data pins. The issue is that the “disabled” PIC is still influencing the serial data, so the data lines (PIC pins 9, 11, 12 and 13) should be disconnected from the circuit. I have been looking at the schematic and don’t see an “easy” fix that keeps the Vectrex modes.