This is a thread to track whatever we discover regarding ECU internal wiring / code / experimenting.
Dark color coating the external metal box. From an EA82 4x4 Wagon.
ECU is labeled:
22611 AA100
MECF-001
5Y14
The UV erasable EPROM is a Hitachi HN482764G.
8K x 8 28pin Ceramic DIP
The CPU is a Hitachi HD6301V1P
1MHz 8 bit 5V CPU I have the data sheet. Includes the Op codes. Object code compatible with 6801 family.