CPU's

[Bob Wooten]

I think that i have this straight, but would like to get your opinions on
this.  I mostly stole it from the Tuner Cat FAQ's but have added some
information to it from the list's.  i do have two Q's though.  the first is
how do i determine the Broadcast code?  i have Win Bin, AFR Modifier, &
data master all loaded up & none of them are telling (or i am missing it). 
the other thing is the question in the little description below.  

thanks again,
BW

PS i have this in a nice easy word document if anyone thinks that this
would be a good thing to put into incoming or onto the FAQ section of the
site.




SW template, Prog p/n, Broad cast code, Prom ID, ECM p/n, Model Year,
Application
ID Byte,					    Scan ID,
						
$8D		16141562	AUJP/1563	    5991	 1227730  89-91	    F/Y Body

Þ SW Template:
	The software template, or ID Byte, is always a two bit code that describes
the layout of the calibration.  These are the exact locations of tables &
formulas that calculations are performed.  By looking @ the SW template you
can know the locations of the tables in the calibration (which will give
you an idea of application), but not the calibration of those tables (which
you are probably going to change if you are reading this).

Þ Prog. p/n:
	This is the GM part number for the program that is the calibration for
that application and the other hardware that is required to install it into
the ECM.

Þ Broadcast code:
	The broadcast code is a four letter group that is unique to the actual
firmware in that ECM.  This is specific to the application (91 Camaro, 5.7L
motor, 700R4, 3.42 gears, etc) and the calibration.  The /1563 number is
the last four digits of the GM part number for the calibration. (BW
confusion here, why is it +1 digit?)

Þ Scan ID:
	The scan ID or the Prom ID is a four digit number that is programmed into
the firmware that tells the user the basic programming characteristics of
that calibration and is specific to both the calibration and the
application.  This number is for the mechanic or technician that has a scan
tool that has it plugged into the ALDL connector.  The mechanic can look up
the calibration of the application & know if it has been updated or changed
or if it ought to be.

Þ ECM p/n:
	This is the GM part number for the ECM.  This part number can & is used in
many different applications depending on how GM wanted to use that ECM.
This means that the same ECM can be used in a 4 cyl. naturally aspirated
application or an 8 cyl. blown application.  The peripherals (knock sensor,
O2 senor, map sensor, purge valve, etc) that are used in that application,
is going to dictate the wiring harness & the calibration of the prom.  



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