I don't have any pictures handy, but let me give you the information I have handy:
All North American Legacy Turbo ECUs have the same construction. They look internally just like the one in morgie's pictures. Just one circuit board.
There are five different part numbers: 22611AA690 through 22611AA694; each one superceded the previous one. 22611AA690 through 22611AA692 were used only in the 1991 model year. Near the end of the 1991 model year they switched to 22611AA693, which they kept using until partway through the 1992 model year, when they switched to 22611AA694. 22611AA694 was used from then until the end of the 1994 model year.
The differences between them appear to be primarily in the programming.
The ECU's EPROM is a 27C256, but it's soldered on. There's a very weird blue 30-pin male very wide socket around the EPROM, presumably for installation of an upgraded ROM. You can see these in morgie's first picture.
The processor is a Hitachi HD6303-series and it's supplemented by a Hitachi HD63140 universal pulse processor to handle most of the I/O.
The pinouts of the ECU itself are described at
http://www.graphics.cornell.edu/~v/ecupins/. I have not been able to find the pinouts for either of the two aforementioned Hitachi chips, frustratingly.
I have more notes on the circuitry somewhere...
If you tell me more about what you're trying to do, maybe I can help. It sounds like you're trying to do what I'm trying to do.
"Just reading vrg3's convoluted, information-packed posts made me feel better all over again." -- subyluvr2212
