I haven't been on here for a while but I'm certain that this is a 68HC16. There are pads on the back that allow wiring to the BDM port. I've modded mine but not yet tried to read it.
I'm still trying to get into mine. The Motorola drivers are written for an old PC (286/386) and there are two files, one for the PE interface and one for the public domain interface. You can work out the correct pinouts from the source code. I have managed to compile the source code using Borland Turbo C on an old 166MHz PC running Win95. The problem that I have is that the ECU is continuously resetting which causes it to drop out of background debug mode. It is difficult to debug with the DOS/PC setup so I am going to try using a microcontroller so I can control the timing more accurately. I think that there may be a watchdog timer running that is causing the problem, the reset is at around 100ms intervals so I believe that its too short to be a diagnostic reset. Hopefully I can get round this by commanding background debug mode and then issuing a stop processor command. I can send you the DOS executable file if you want to try it. Cheers James