MyE28.com

For the curious, I reverse engineered the phantom part on the digital side. There is a IC near the 8051 CPU that had labeling unknown to me, see earlier thread:
059 thread

Upon further inpection, the part is 256x4 SRAM that has battery backup from the no-switched 12V input. So, up to 256 nibbles can be stored for adaptation. These are lost when the battery is disconnected. Now I can rest.....I was tracing signals till 3:30AM last night, got up at 8AM and started back in.

For the technically curious, heres the data sheet:

CPD1822 256x4 SRAM from RCA, now Intersil

RussC

So it does have a memory? Interesting . . . I guess the next task would be to somehow figure out what it remembers!!

You're not going to rest until you know the 059 better than anyone, are you? Not that there's anything wrong with that.

Jeremy

[QUOTE="Jeremy"]So it does have a memory? Interesting . . . I guess the next task would be to somehow figure out what it remembers!!

You're not going to rest until you know the 059 better than anyone, are you? Not that there's anything wrong with that.

Jeremy[/QUOTE]

yes, it does have memory. What it stores is drive specific data and trim values I'll bet. I remember JimC saying the the DME will increase fuel/timming if it sees lots of WOT conditions, and then will lean out if it sees lots of cruising.

Um, I'll never know as much as SteveD or JimC. I believe at the least these guys were given from BMW or developed themselves tuning tools to do this stuff easily. Maybe even has source code.

RussC