Prom problem?

[Bob Wooten]

Evening gents,

This seems like an elementary thing but for someone that is new to
electronics this might not be so intuitive.  especially when, as yall have
pointed out, the CPU gets power from several places.    this is one of those
things that gets forgotten when helping a new person start doing the editing
boogie.

I have been looking into emulators, & one of the things that the tech tools
emulator provides is a RESET or ~RESET line that you connect to the target.
the emulator pulls the reset line before it downloads the image & then when
it is done with the down load (& the check if turned on) it lets go of the
line.  this forces the CPU (& anything that has a RESET) to come up & start
as if it were first turned on.  for this reason, I have been checking this
out on my 7730 CPU & it would be rather simple to wire this up to a
momentary (although I would hate for the switch to short to ground as I am
doing a buck-20), for this purpose.  I have to find it anyway for the
emulator, so.......... just a thought.

thoughts?
BW

-----Original Message-----
From: owner-gmecm at diy-efi.org [mailto:owner-gmecm at diy-efi.org]On Behalf
Of Bob Valentine
Sent: Tuesday, March 06, 2001 10:51 AM
To: gmecm at diy-efi.org
Subject: Re: Prom problem?


You're supposed to unplug the ECM every time?   (*grin*)

I have a NC pushbutton switch that I've been meaning to put inline with
power to the ECM for easy resets.

-> Bob Valentine
-> bob at tecmark.com

At 12:52 AM 3/6/2001 -0700, you wrote:
>Is he perhaps leaving the PCM plugged into the harness when doing the chip
>change ?
>
>Lyndon.
>-----Original Message-----
>From: Bob Valentine <bob at tecmark.com>
>To: gmecm at diy-efi.org <gmecm at diy-efi.org>
>Date: March 5, 2001 9:51 PM
>Subject: Re: Prom problem?
>
>
>>I've had this occasionally with my '730 (running 730 code *^),  Reseating
>>the eprom usually fixes it.   Sometimes the idle goes wierd after a new
>>chip, quick cycle of the power to the ECM fixes it every time.
>>
>>I've learned is to watch the CEL after putting in a new chip.  If it
>>doesn't do one quick blink after power up, something's wrong.
>>
>>-> Bob Valentine
>>-> bob at tecmark.com
>>
>>
>>At 08:07 PM 3/5/2001 -0600, you wrote:
>>>Well I'm having a slight problem with the 749 code in the 730.  Seems
when
>I
>>>swap chips the ECM wants to get a check engine light and run like total
>>>crap.  I pull the power and EPROM and swap everything back and forth and
>>>after a couple times and then it works.  Anyone know a way around this?
>>>Like something that works almost all the time.
>>>
>>>Dan
>>>
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