95 vs 96 pcm

[Ken Kelly]

Eric,
	It is as easy as Flipping the Bit!! But first you have to
find the bit, and since it is a Flash based PCM you need to
have a complete software package to reprogram it. Before we
wrote our tools, I socketed my PCM and used a prom burner to
change things. This is not for the faint of heart. The Flash
chips are 32 Pin J-lead and are in the middle of a lot of
components. Removing them and putting sockets on the board
requires special tools and skills.

	If you don't have the tools: Socketing or Flash Programming
Software, I recommend a 555 timer creating a 50Hz square
wave to fool the PCM. If you are getting any custom
programming on the PCM, then get it turned off. I can
disable it if people need it done. 

		Ken

Eric Clark wrote:
> 
> Why would the 8051 be any different than previous ECM's.  In my 9278,
> Roger and I found the VATS enable bit, and flipped it off.  Simple as
> that.  Finding the right bit may be another matter all together.
> 
> -Eric
> 
> On Wed, 15 Dec 1999, Ken Kelly wrote:
> 
> > All factory 8051's seem to have VATS enabled. In some police
> > models they had no Key pellet, and used a seperate module
> > under the dash to generate the 50 Hz signal to the PCM. You
> > must either use a 555 to generate a 50 Hz squarewave or
> > disable VATS in the PCM.
> >
> >               Ken