GM P6 PCM

[Bill the arcstarter]

It was written:
>Delco came back and said the 16156598 chip is the GMP6 CPU and it is a

Delco is actually helping you with this?  This is surprising...

>variant of the Motorola MC68HC11F1 (Though GM/Delco discontinued 
it...).
>I've been tracing address lines and data lines...
>Data Lines D0 thru D7 go to: pins 42-35 on the 16056597 chip (52 Pin 
PLCC),
>Pins 43,42,39-34 on the 16072449 chip (68 pin PLCC) and pins 5-2 & 
67-63 on
>the 16066285 chip (68 pin PLCC).
>Address lines A0-A15 all go to the Memcal (27C512 chip), but A0-A10 
only go
>to pins 53 & 51-42 of the 16066285 chip... None of the address lines go 
to
>any of the other large chips on the board.

I'd hazard a guess that your 16066285 chip is a 2K static RAM.

You mentioned pins 5,4,3,2,67,66,65,64,63 on the 16066285 part.  This is 
a total of 9 lines.  Is one of these the r/W line or a CS?  

My $0.02...

-Bill

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