Re: C3 with 8192 ALDL

[Pat Ford <pford@qnx.com>]

Previously, you (Ludis Langens) wrote:
{
{ 
{ The other big difference is in the 40 pin DIPs.  A '7148 contains a
{ 26369, 23263, 51179, 51174, and a 21633.  The first two are timer chips,
{ the second two mask ROMs, and the last is the CPU.  The '7057 contains a
{ 26369, 23263, 24007 aka CE1205, 44006 aka CE1204, and a 35997.  I assume
{ the third and fourth are the mask ROMs and the last is a different CPU.
{ 
{ I disassembled the software code in the '7057's MEMPAK.  It turns out
{ that this ECM uses a Hitachi 6303 (or 6301) MPU instead of the normal

 Thats the same chip ( if it was a 6303 ) that the swifts and sidekicks use
( as well as the gm variants)

{ GM-custom CPU used in so many C3 ECMs.  I had to change my disassembler
{ to handle the extra incompatible opcodes of the 6303.

 What disassemblers do you use?

{ 
{ I found the ALDL tables in the '7057's EPROM.  There are multiple tables
{ stored in the linked list format common to many early P4 ECMs!  Thus,
{ this ECM may use 8192 baud ALDL.  The 6303 contains the necessary UART.
{ 
{ I don't know how common the '7057 is.  It's only in two years worth of
{ E-bodies, which I don't recognize on sight.  It is possible that I've
{ walked past many of them.  The engine looks just like any other Buick
{ 3.8.
{ 
{ -- 
{ Ludis Langens                               ludis (at) cruzers (dot) com
{ Mac, Fiero, & engine controller goodies:  http://www.cruzers.com/~ludis/
{ 
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--
Pat Ford                           email: pford@qnx.com
QNX Software Systems, Ltd.           WWW: http://www.qnx.com
(613) 591-0931      (voice)         mail: 175 Terence Matthews          
(613) 591-3579      (fax)                 Kanata, Ontario, Canada K2M 1W8

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