I've only had a brief look around this ECU, it uses an Hitachi HD63B03 processor combined with an HD63140 Universal Pulse Processor
(UPP). The UPP is a quite powerful timing processor that gives this ECU a lot of capability considering its architecture. The external EPROM
is a 27C256, I have read the binary and carried out a disassembly (which I've temporarily misfiled!). I haven't spent any real time on this
so very little of the code is commented.
Complete ECU
Signal Conditioning Board
Processor Board
This image shows the PCB with the EPROM removed to be read.