[Diy_efi] Another Eprom Question
David Cooley
n5xmt at bellsouth.net
Tue Jan 25 23:26:32 GMT 2005
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wonder if part of the problem isn't the 29C010... I'd try it with a 27C0=
10
and see if you have the same problem...=0D
=0D
-------Original Message-------=0D
=0D
From: mbelloli at speedymotorsports.com=0D
Date: 01/25/05 18:17:19=0D
To: A list for Do-It-Yourself EFI=0D
Subject: Re: [Diy_efi] Another Eprom Question=0D
=0D
That is basically what I have now, but it is setting the check=0D
engine. And you will have basically a prom error, and the vehicle=0D
running off something other than the chip. It runs like crap. This=0D
is in a 1993 Acura Integra with a GSR motor, and a p28 computer.=0D
Stock came with a 27C256. It already had an eprom in it. Now it=0D
doesn't do it every time. I like every third time it will set the=0D
check engine lamp. you'll have to clear codes, or disconnect the=0D
battery to get it running correctly again.=0D
=0D
Thanks,=0D
=0D
Marcello=0D
=0D
> Back in 87 I was running a 27C512 with 4 programs on my Buick GN...=0D
> had a small board the chip was on and a shielded ribbon going to the EC=
M.=0D
> would toggle the 2 highest address bytes with a thumbwheel on the dash =
to=0D
> change banks and did it on the fly all the time with no CE light.=0D
>=0D
>=0D
> -------Original Message-------=0D
>=0D
> From: mbelloli at speedymotorsports.com=0D
> Date: 01/25/05 15:13:07=0D
> To: diy_efi at diy-efi.org=0D
> Subject: [Diy_efi] Another Eprom Question=0D
>=0D
> Hello everyone,=0D
> I have been pulling my hair out trying to figure out another one of=0D
> these chipping ideas. I am trying to set up a controller to allow=0D
> the switching of which chip the ecm of a car computer is running on=0D
> the fly while driving. Currently I've got it working very well if=0D
> you switch with the key off, but not while running. The original=0D
> chip was a 27C256, which switched out for an ATMEL AT29C010. I=0D
> really only wanted 4 choices, which this chip more than allows. I am=0D
> trying to set it up so I can have pic processor do the switching for=0D
> me. I cound't put a picture of the waveform that is driving me crazy=0D
> here so I put it on my website at=0D
>=0D
> https://home.comcast.net/~hexibot43/ChipEnableLogic.htm=0D
>=0D
> I just can't understand why it is working right now with the signal I h=
ave=0D
> on the Output enable pin. From what I understand it shouldn't be workin=
g,=0D
> but it is working. I thought I was going to simply look at the signal,=0D
> and see drops to ground like I did with the last car computer I looked =
at.=0D
> I figured I could use that as a trigger for an interrupt the would in=0D
> turn wait a set amount of time and then switch banks. This way I could =
do=0D
> the switching when the chip was not be read from, and so the ecm would =
be=0D
> happy and not throw an check engine lamp at me.=0D
> Can anybody sheld some light on this for me? You guys did so well=0D
> helping me last time, I hope you can do it again. And yes, I still=0D
> have a lot more to learn.=0D
>=0D
> Thanks,=0D
>=0D
> Marcello=0D
> _______________________________________________=0D
> diy_efi mailing list=0D
> diy_efi at diy-efi.org=0D
> http://lists.diy-efi.org/mailman/listinfo/diy_efi=0D
> _______________________________________________=0D
> diy_efi mailing list=0D
> diy_efi at diy-efi.org=0D
> http://lists.diy-efi.org/mailman/listinfo/diy_efi=0D
>=0D
=0D
_______________________________________________=0D
diy_efi mailing list=0D
diy_efi at diy-efi.org=0D
http://lists.diy-efi.org/mailman/listinfo/diy_efi=0D
=20
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<DIV>wonder if part of the problem isn't the 29C010... I'd try it w=
ith a 27C010 and see if you have the same problem...</DIV>
<DIV> </DIV>
<DIV id=3DIncrediOriginalMessage><I>-------Original Message-------</I></D=
IV>
<DIV> </DIV>
<DIV id=3Dreceivestrings>
<DIV dir=3Dltr style=3D"FONT-SIZE: 11pt"><I><B>From:</B></I> <A href=3D"m=
ailto:mbelloli at speedymotorsports.com">mbelloli at speedymotorsports.com</A><=
/DIV>
<DIV dir=3Dltr style=3D"FONT-SIZE: 11pt"><I><B>Date:</B></I> 01/25/05 18:=
17:19</DIV>
<DIV dir=3Dltr style=3D"FONT-SIZE: 11pt"><I><B>To:</B></I> <A href=3D"mai=
lto:diy_efi at diy-efi.org">A list for Do-It-Yourself EFI</A></DIV>
<DIV dir=3Dltr style=3D"FONT-SIZE: 11pt"><I><B>Subject:</B></I> Re: [Diy_=
efi] Another Eprom Question</DIV></DIV>
<DIV> </DIV>
<DIV> That is basically what I have now, but it i=
s setting the check</DIV>
<DIV>engine. And you will have basically a prom error, and the=
vehicle</DIV>
<DIV>running off something other than the chip. It runs like c=
rap. This</DIV>
<DIV>is in a 1993 Acura Integra with a GSR motor, and a p28 computer.</DI=
V>
<DIV>Stock came with a 27C256. It already had an eprom in it.&=
nbsp; Now it</DIV>
<DIV>doesn't do it every time. I like every third time it will=
set the</DIV>
<DIV>check engine lamp. you'll have to clear codes, or disconn=
ect the</DIV>
<DIV>battery to get it running correctly again.</DIV>
<DIV> </DIV>
<DIV>Thanks,</DIV>
<DIV> </DIV>
<DIV>Marcello</DIV>
<DIV> </DIV>
<DIV>> Back in 87 I was running a 27C512 with 4 programs on=
my Buick GN...</DIV>
<DIV>> had a small board the chip was on and a shielded ribbon going t=
o the ECM.</DIV>
<DIV>> would toggle the 2 highest address bytes with a thumbwheel on t=
he dash to</DIV>
<DIV>> change banks and did it on the fly all the time with no CE ligh=
t.</DIV>
<DIV>></DIV>
<DIV>></DIV>
<DIV>> -------Original Message-------</DIV>
<DIV>></DIV>
<DIV>> From: <A href=3D"mailto:mbelloli at speedymotorsports.com">mbellol=
i at speedymotorsports.com</A></DIV>
<DIV>> Date: 01/25/05 15:13:07</DIV>
<DIV>> To: <A href=3D"mailto:diy_efi at diy-efi.org">diy_efi at diy-efi.org<=
/A></DIV>
<DIV>> Subject: [Diy_efi] Another Eprom Question</DIV>
<DIV>></DIV>
<DIV>> Hello everyone,</DIV>
<DIV>> I have been pulling my hair out trying to figure out another on=
e of</DIV>
<DIV>> these chipping ideas. I am trying to set up a controller to all=
ow</DIV>
<DIV>> the switching of which chip the ecm of a car computer is runnin=
g on</DIV>
<DIV>> the fly while driving. Currently I've got it working very well =
if</DIV>
<DIV>> you switch with the key off, but not while running. The origina=
l</DIV>
<DIV>> chip was a 27C256, which switched out for an ATMEL AT29C010. I<=
/DIV>
<DIV>> really only wanted 4 choices, which this chip more than allows.=
I am</DIV>
<DIV>> trying to set it up so I can have pic processor do the switchin=
g for</DIV>
<DIV>> me. I cound't put a picture of the waveform that is driving me =
crazy</DIV>
<DIV>> here so I put it on my website at</DIV>
<DIV>></DIV>
<DIV>> <A href=3D"https://home.comcast.net/~hexibot43/ChipEnableLogic.=
htm">https://home.comcast.net/~hexibot43/ChipEnableLogic.htm</A></DIV>
<DIV>></DIV>
<DIV>> I just can't understand why it is working right now with the si=
gnal I have</DIV>
<DIV>> on the Output enable pin. From what I understand it shouldn't b=
e working,</DIV>
<DIV>> but it is working. I thought I was going to simply look at the =
signal,</DIV>
<DIV>> and see drops to ground like I did with the last car computer I=
looked at.</DIV>
<DIV>> I figured I could use that as a trigger for an interrupt the wo=
uld in</DIV>
<DIV>> turn wait a set amount of time and then switch banks. This way =
I could do</DIV>
<DIV>> the switching when the chip was not be read from, and so the ec=
m would be</DIV>
<DIV>> happy and not throw an check engine lamp at me.</DIV>
<DIV>> Can anybody sheld some light on this for me? You guys did so we=
ll</DIV>
<DIV>> helping me last time, I hope you can do it again. And yes, I st=
ill</DIV>
<DIV>> have a lot more to learn.</DIV>
<DIV>></DIV>
<DIV>> Thanks,</DIV>
<DIV>></DIV>
<DIV>> Marcello</DIV>
<DIV>> _______________________________________________</DIV>
<DIV>> diy_efi mailing list</DIV>
<DIV>> <A href=3D"mailto:diy_efi at diy-efi.org">diy_efi at diy-efi.org</A><=
/DIV>
<DIV>> <A href=3D"http://lists.diy-efi.org/mailman/listinfo/diy_efi">h=
ttp://lists.diy-efi.org/mailman/listinfo/diy_efi</A></DIV>
<DIV>> _______________________________________________</DIV>
<DIV>> diy_efi mailing list</DIV>
<DIV>> <A href=3D"mailto:diy_efi at diy-efi.org">diy_efi at diy-efi.org</A><=
/DIV>
<DIV>> <A href=3D"http://lists.diy-efi.org/mailman/listinfo/diy_efi">h=
ttp://lists.diy-efi.org/mailman/listinfo/diy_efi</A></DIV>
<DIV>></DIV>
<DIV> </DIV>
<DIV>_______________________________________________</DIV>
<DIV>diy_efi mailing list</DIV>
<DIV><A href=3D"mailto:diy_efi at diy-efi.org">diy_efi at diy-efi.org</A></DIV>
<DIV><A href=3D"http://lists.diy-efi.org/mailman/listinfo/diy_efi">http:/=
/lists.diy-efi.org/mailman/listinfo/diy_efi</A></DIV>
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