Copy of: Delco ECM uP type

Martin Evans 100341.377 at compuserve.com
Mon Sep 18 20:07:02 GMT 1995


Does anyone out there know what the basis of the uP used in 
my Delco sourced ECM is?

The service number is:
161322411.6D MAN FED 16161499 AXMZ

The prom is a 27128 type mounted on a blue/brown 
header plugged into the pcb.

On the pcb are a number of 52 pin plcc packaged ic's
markings as follows

2 chips marked 519K 9115 1049 16079435
1 chip marked DELCO 16126532 161 9049 JAPAN A 035
1 chip marked 185 16126997 KQEVZ9028D

The chip is probably not a 68HC11 as it seems to write 
to the TMSK2 register twice in the first few lines of code 
and also tries to read the CFORC register which is 
supposed to be write only. I'm begining to come to 
the conclusion that the uP is either a special or maybe 
a 6801/6805.

The code 27C107 P5 is etched on the topside of the 
board with 27107 P8 in the silk screening.

Anyone got any ideas?

Martin Evans




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