Re: PCM Questions

[Ward <WSpoonemore@excite.com>]

The P6 PCM (non OBD II versions), covers a large range, starting with Cad's
Northstar in about 90/91, Saturn then 92/95 Vette, LT1, 92 - 95 C/K truck
and so on. It supports 4l60, 4l60E, 4l80E and manual, DIS and HEI, TBI and
Multi Port, 4, 6 and 8 Cyl. 

In other words just about everything after 1992. A ten year old design. 

It's a HC11F1 proc with a faster clock rate, 256k to dual 512k Flash menory.

8192 serial communcations. 

A good choice all things considered, since the P4 processor is a 20 year old
design. A bit long in the tooth for electronics. Any you guys using 20 year
old PC's?

Ward


On Fri, 17 Mar 2000 01:04:10 -0600, gmecm@diy-efi.org wrote:

>  Hope you guys don't mind some PCM questions... I can't search the
>  archives, I haven't been able to connect to it in a week.
>  
>  Anyone have info on a 16196401 PCM?  It was used 94-95 in the 3.4 DOHC
>  engine.
>  On the outside it LOOKS like a 1227727.  It is the successor to the
>  16149396 (used 91-93 on the 3.4 DOHC), which I believe is just a 1227727
>  with extra SRAM.  The big change I noted is SFI.
>  So I thought maybe the 6401 is a 7727 with SRAM and additional quad
>  drivers for SFI, but then I looked at the pinouts, and it's 100%
>  different.  Same four 22-way connectors, but the pinouts aren't even
>  CLOSE.  It does, however, seem to use a MEMCAL, though I don't know for
>  sure because I don't have one to play with.
>  
>  Another question: P6 PCMs, how does a DIY'er read the software from
>  them, and reprogram them?  I'm sure this is in the archives, but the
>  archives aren't accessible.  I'm mainly talking about the 16196397 PCM. 
>  Also, what's the difference between the 16172693 and the 16196397?  I'm
>  going to guess these are both pre-OBD II.  Info on P6 PCMs seems to be
>  kind of scarce.
>  
>  Thanks for any info.
>  
>  -- 
>  Shawn Lin
>  http://www2.cybercities.com/g/gmwbodycars/
>  __________________________________________





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