References for EFI tweaking

[Buchholz, Steven]

Can anyone recommend a good reference for techniques for adjusting timing
and fuel maps in EFI systems?  I checked the DIY-EFI homepage reference link
... but it seems to be no longer valid.  I am looking for info that would
help figure out the right way to deal with flat spots in performance,
surging and that sort of issue. This would be for a Bosch Motronic system
... 

BTW, do all Motronic systems use the same processor?  How consistent are
things like I/O mappings in the different versions?  The processor in the
one that I'm adjusting has what appears to be some sort of proprietary
number ... I'd like to know what the instruction set is ...

Final question ... I suppose that the debug process would be simpler with
some sort of ROM emulator.  Are there any available that run on 12 volts and
emulate a 27C256 device?

TIA!
Steve Buchholz
San Jose, CA (USA)