Memcal BCC Numbers

[Bruce Plecan]

----- Original Message -----
From: Ross Myers <ponty at axis.jeack.com.au>
To: GM ECM List <gmecm at efi332.eng.ohio-state.edu>
Sent: Monday, November 29, 1999 8:11 AM
Subject: Memcal BCC Numbers

The only thing that I've seen that "usually works" is that on the P4, and
newer (not sure about flash eeprom ones), is that 0008 or 4008 is a Mask
Identifier.
Meaning while the code may vary some the tables still line up (or mostly
so).  I know of no absolute answers.
   More specifically, the BCC, and numerical identifiers have no true
relationship that I've seen heard of.  Just the other day we had the
pposting about BUA having two numerical identifiers.
Grumpy


| Hi all,
| I've been trying to figure how the number codes on the BCC may relate back
| to the actual code in the EPROM.
| Mythical example BCC - ABCD1234 , how is that 1234 generated?, is it just
a
| random number the factory picks, do you add $xx - $yy and this gives you
the
| number?.
| What I can say is the 'double byte PROM codes' get close. Here's some
| examples-
| BLJX6413 - Dbl PROM I.D val = $1912, convert to dec = 6418
| BWCS9976 - Dbl PROM I.D val = $270E, convert to dec = 9998
| BMZA1754 - Dbl PROM I.D val = $06DE, convert to dec = 1758
| Here's the hex line from the BMZA1754 I get this from -
| 06DE FFFF FFFF 5C0F 11 {CALS FROM HERE ON}
| ARGGG, only a few bytes off in all cases, I can't pick it, anybody else?
| Note - these are from Holden Memcals, though I can't see them being much
| different.
| I've got alot of bins with only a letter code listing, as we all know GM
| likes to double up on these thats why the numbers in the BCC are also nice
| to know.
| Thanks
| Ross Myers