I have a 1985 Laser XE cluster on my benchtop right now with the ODO chip signals on the logic analyzer. You have to be careful as there are two negative power supplies to the chip. There is a -5 which probably would not kill my test equipment, but the apparent programming voltage(always present) is -30V!I for got to add that I am sure that there is a standard EPROM that is compatable with the Chry P/Ns. If all else fails, I can trace the EEPROM datalines and construct the pin out, and use trial-and-error to acheive a coherent ROM dump.
Hi Dennis,Here is a link to a website that has some source code for our ECU's. Be a good starting point. At least with the code you can figure out your input/output, and which one's are analog.
I don't know of a good decompiler for the CPU. Depending on the CPU you can use ASMFLOW to flow chart it.
I'm getting close, but It looks like I'm going to have to build a burner for the ER-1400 chip as it uses some strange power supply (-30V). Its a pretty simple burner with a schematic and software online, but it may take me a few months to get the time to construct it. I ordered some blank chips on eBay and I plan to offer ODO chip replacement for a nominal fee to cover the parts cost and recoup the cost of building the programmer as a service to us Digi-Dash enthusiasts. Most likely your chip is dead as after 10,000 ignition cycles or so the chips cannot be programmed anymore as they electrically "wear out"...If any of you figure out how to get these chips to work let me know please. I need one done for a 1986 Chrysler Executive Limo (Stretched Lebaron) at some point. I have the current ------- thing of death on mr digital dash.