My plan is to install v3.3 on a Porsche 944 -83. My idea is to place the the genboard in a empty motronic box and use as much as possible of the original wire harness. I guess one of the bigger problem I will have to deal with is the trigger system with 2 VR-sensors, one keeping track of the referens point and one counting the 130 teeth on the starter gear. I understand it is a version of the "auditrigger".
The parts has arrived and everythings looks fine. Delivery was very quick! :)
Serial cable and power cable has been attached to the board for some initial testing before soldering more parts to the board. The only problem is that it does not work the way it should. The Mega128 seams more or less dead (no signal at the x-tal), often it takes half an hour before it starts up so you can get some communication with a terminal program. Manmllcommand works fine but Megatune can not connect to the board.
Once you get it starting it will stay alive until you remove power for a few minutes. 5V supply is always okay and the reset signal goes to high every time you apply power.
My next idea was using ISP cable and BASCOM-AVR to connect to the chip and see if BASCOM's 'identify chip' function worked. It did not, BASCOM didn't get any data from the chip. BASCOM and the cable worked fine with a Mega88 chip both before and after my test.
Q: What to do next?