This is a simple RGB mod for early model N64's that use the VDC-NUS encoder.
Original project by Borti: https://github.com/borti4938/n64rgb
Assembly Guide: https://docs.google.com/spreadsheets/d/15hhNJlhBKA1HLtDJtVe7wfJfRlRELG2VrDGQ66n2hy0/edit#gid=596460619
Assembly and Install Video: https://youtu.be/aAcEjx-4_VE