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Re: C3 with 8192 ALDL
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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