RE: VR6 ECU

[Terrence Murphy <terryjm@teleport.com>]

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> Ok after some poking around I found some more information about the VR6
> ECU.  It is possible that the VW ECUs and BMW ECUs are similar (since they
> are both made by bosch).  If anyone has access to a 92+ 325 or 328, can
> someone verify if they have the same processor and EEPROm as we do?  They
> list the processor for the BMWs are an MCS-96/51 and a EEPROm of 27C512.
> The eeprom should look something like (pardon my ascii art again):

Hello - done some work with microcontrollers in the past...

MCS-96/51 is the Intel 8051 or 8096 chip family, this is the CPU, although 
it is called a 'microcontroller' because it has alot of I/O and interface logic 
that CPUs traditionally lack, a.k.a. the "single chip computer".  Document-
ation is readily available as data books published by Intel for sale at places 
that sell digital electronics.  Actually, they're probably available as Adobe 
Acrobat PDF files at the Intel Developer web site.

27C512 is an EPROM (uv-erasable - uv = ultra-violet), EEPROM (electrically-
erasable) series parts start with a 28 instead of a 27.  The C means CMOS 
(instead of bipolar or other technologies).  Finally, the 512 indicates that the 
memory capacity is 512M bits, which (dividing by 8 bits per byte) equals 
64K bytes.  27 series parts are erased with UV light, and written to with an 
EPROM burner.

Both of these chips are _very_ common parts that will be very familiar to 
any electrical engineer or tech with a digital background.  I have databooks 
with specs for both of the chip families, in fact, I have a few of these parts 
lying around.

Happy reverse-engineering!

Terry Murphy

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