intro, hyper7148

[Ken Kelly]

Tom,
	I am working with Dave Hemstead on the 8051(95 Camaro LT1). I have currently
socketed my PCM so I can read/write the Flash Memory. I suspect that it uses the
same protocol as the 97. Since my PCM is now socketed it is a very safe place to
test a read & write program. I am working on a prom editor for the 8051. It has
two 28F512's labeled EVENT SIDE and TIME side. Maybe we could work together on
this. Dave has put together a scan tool for the 8051 and is currently
disassembling the Prom, and I am working on the editor.

		Ken

Tom Hussey wrote:
> 
> Mike Pitts wrote:
> 
> > The P4 however does not require a DirectScan type of tool because
> > the P4 has a "memory read" serial command that allows you to read
> > any location in the 64k memory space, including registers and such.
> > At 8192 baud, the speed has been sufficient for my purposes.  I've
> > adapted the code in the eprom to accept a custom "memory write"
> > command of my own design so that I can write to RAM and to EEPROM.
> > I've even protected the routines from race-conditions.
> In my work on my '97 I have found the direct read as well and used it to
> dump the memory space. In my case however, the Flash used is 512K and is
> bank switched. The memory read can not get to the second bank and many
> of the other modes for OBD 1 are gone in this later code. I am working
> on download through the OBDII (J1850) port now. Code is huge however. I
> have more than 8K of commented disassembly for DTCs and freeze data now.
> >
> > BTW: I have a friend who cooked his DirectScan by plugging the
> > card edge connector upside-down (it's not keyed).  He's lucky he
> > didn't cook his ECM, although they are plentiful and cheap in
> > the local boneyards. 8-)
> >
> > -Mike