[Gmecm] Converting eprom to eeprom problem

[Steve Ravet]

Mike, GND is ground, same as low.  Like Bruce said, what you want is a
pullup resistor on the address line that keeps that pin high.  Then a
DIP switch to connect the pin directly to ground:

               4.7K
          |---/\/\/---Vcc
A12-------|
          |       \
          |------  \---GND
                  S

With the switch open as shown A12 is "high" via it's connection to Vcc
through the resistor.  with the switch closed the ground connection
overpowers the Vcc connection (due to the resistance in the Vcc
connection) and pulls the pin to ground.

You still may have problems throwing the switch while the ECM is
powered, if A12 toggles in the middle of an access you'll probably get
garbage.

--steve

> -----Original Message-----
> From: gmecm-bounces at diy-efi.org 
> [mailto:gmecm-bounces at diy-efi.org] On Behalf Of Mike Poore
> Sent: Wednesday, October 05, 2005 3:23 PM
> To: Rick McLeod; gmecm at diy-efi.org
> Subject: Re: [Gmecm] Converting eprom to eeprom problem
> 
> Vcc is my high signal, and CE was my low. I think CE is a 
> problem too, but I
> don't see sig ground on the pinout. Is that just another word 
> for the GND
> pin? If yes, does GND really supply a low signal, or will it 
> require other
> components to complete? What components will I need?
> 
> Thanks, Mike
> ----- Original Message -----
> From: "Rick McLeod" <dunvegan at sbcglobal.net>
> To: <mp at FlowersByValerie.com>; <gmecm at diy-efi.org>
> Sent: Wednesday, October 05, 2005 12:13 PM
> Subject: Re: [Gmecm] Converting eprom to eeprom problem
> 
> 
> > If you're using CE to as a bank select, I would
> > suspect that to be the problem. I would dip switch a
> > static voltage, VCC or sig ground, the CE is an active
> > signal that would then be causing it to change banks
> > during run, which I'm sure will throw a code form my
> > experience of trying to switch banks while running on
> > other primitive ECMs.
> >
> > Just a thought
> >
> > snipped the rest
> 
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