Part of the problem is that ND uses proprietary packaging for their processors, making life difficult for folks like us.

I actually have photos up of the boards from the CX500T, CX650T, and RX-7. The RX-7 has a 40-pin MPU with a window that was filled in with plastic, apparently. The outboard chips are mostly simple TTL DIPs. The CX500T is very odd; it has two 40-pin ICs and an outboard 2k EPROM. I had a guy poking at it and he said one of the outboard chips was an EPROM with in-built ports, one made to work with the 8085! Oddly, both the ROM dumps (from the plain EPROM and the 40-pin package) are just maps -- no runtime to be found. There's also a PIT onboard that was likewise made to work with an 8085. But none of the 8085 family have onboard RAM or ROM, so where is the RAM, where is the runtime? Has me scratching my head. The 650 also has two 40-pin units, but one has a filled window like the RX-7 MPU, and no PIT. They are all in the right vintage to be 8051-based, and I'm pretty sure ND was only using Intel MPUs at the time. The Hondas are pretty sophisticated systems; the 1983 unit for the CX650T was the first production motorcycle engine management system, with two spark channels and two injector channels, and reading two cam position sensors and a crank angle sensor as well as three pressure sensors and a TPS, plus IAT and coolant temp. I believe they did on the 650 like they did on the 500, according to the service manual; they had two maps, one for boost pressure and engine speed, one for TPS and engine speed, and they added them to come up with a fueling determination. That would account for the two complete map sets dumped from the 500.

Photos are here: http://www.flickr.com/photos/38...348587205/

I am also quite willing to ship ECUs if need be. I have another hardware guy locally who might be of help, but it'll probably be at least a few weeks before I can get together with him, and probably several months waiting for him to get around to poking at the ECUs.

I would definitely like to talk to you about the Kawasaki ECU, although I got the feeling in my research for the book that it was a pretty basic 8051 implementation; perhaps I got less than enlightening data on the complexity of that ECU... Let me know if you want larger image files than the 1024 max on Flickr, or an email of the ROM dumps. Thank you.