[Diy_efi] Another Eprom Question
David Cooley
n5xmt at bellsouth.net
Wed Jan 26 03:09:06 GMT 2005
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What's the access time on the 29C010? is it as fast or faster than the
original EPROM? if not that could be the problem.=0D
=0D
=0D
-------Original Message-------=0D
=0D
From: mbelloli at speedymotorsports.com=0D
Date: 01/25/05 20:00:42=0D
To: A list for Do-It-Yourself EFI=0D
Subject: Re: [Diy_efi] Another Eprom Question=0D
=0D
I sure hope not! I'm really trying to get this all set up to do minut=0D
changes on the fly. I need an eeprom to be able to do that. Soon enough=
=0D
here I'll have it so I just am changing a small part of the whole program=
=0D
instead of the whole thing. I want to be able to make changes to the fue=
l=0D
table, and spark table while driving. Not just switch out one chip for=0D
another.=0D
Thanks,=0D
Marcello=0D
=0D
> wonder if part of the problem isn't the 29C010... I'd try it with a=0D
> 27C010=0D
> 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=0D
>> ECM.=0D
>> would toggle the 2 highest address bytes with a thumbwheel on the dash=
=0D
>> 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=0D
>> have=0D
>> on the Output enable pin. From what I understand it shouldn't be=0D
>> working,=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=
=0D
>> 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=
=0D
>> do=0D
>> the switching when the chip was not be read from, and so the ecm would=
=0D
>> 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
> _______________________________________________=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>What's the access time on the 29C010? is it as fast or fa=
ster than the original EPROM? if not that could be the problem.</DI=
V>
<DIV> </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 20:=
00:42</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>I sure hope not! I'm really trying to get this all set up=
to do minut</DIV>
<DIV>changes on the fly. I need an eeprom to be able to do tha=
t. Soon enough</DIV>
<DIV>here I'll have it so I just am changing a small part of the whole pr=
ogram</DIV>
<DIV>instead of the whole thing. I want to be able to make cha=
nges to the fuel</DIV>
<DIV>table, and spark table while driving. Not just switch out=
one chip for</DIV>
<DIV>another.</DIV>
<DIV>Thanks,</DIV>
<DIV>Marcello</DIV>
<DIV> </DIV>
<DIV>> wonder if part of the problem isn't the 29C010... I'=
d try it with a</DIV>
<DIV>> 27C010</DIV>
<DIV>> and see if you have the same problem...</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 18:17:19</DIV>
<DIV>> To: A list for Do-It-Yourself EFI</DIV>
<DIV>> Subject: Re: [Diy_efi] Another Eprom Question</DIV>
<DIV>></DIV>
<DIV>> That is basically what I hav=
e now, but it is setting the check</DIV>
<DIV>> engine. And you will have basically a prom error, an=
d the vehicle</DIV>
<DIV>> running off something other than the chip. It runs l=
ike crap. This</DIV>
<DIV>> is in a 1993 Acura Integra with a GSR motor, and a p28 computer=
=2E</DIV>
<DIV>> Stock came with a 27C256. It already had an eprom in=
it. 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 di=
sconnect 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 program=
s on my Buick GN...</DIV>
<DIV>>> had a small board the chip was on and a shielded ribbon goi=
ng to the</DIV>
<DIV>>> ECM.</DIV>
<DIV>>> would toggle the 2 highest address bytes with a thumbwheel =
on the dash</DIV>
<DIV>>> to</DIV>
<DIV>>> change banks and did it on the fly all the time with no CE =
light.</DIV>
<DIV>>></DIV>
<DIV>>></DIV>
<DIV>>> -------Original Message-------</DIV>
<DIV>>></DIV>
<DIV>>> From: <A href=3D"mailto:mbelloli at speedymotorsports.com">mbe=
lloli 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 anothe=
r one of</DIV>
<DIV>>> these chipping ideas. I am trying to set up a controller to=
allow</DIV>
<DIV>>> the switching of which chip the ecm of a car computer is ru=
nning on</DIV>
<DIV>>> the fly while driving. Currently I've got it working very w=
ell if</DIV>
<DIV>>> you switch with the key off, but not while running. The ori=
ginal</DIV>
<DIV>>> chip was a 27C256, which switched out for an ATMEL AT29C010=
=2E I</DIV>
<DIV>>> really only wanted 4 choices, which this chip more than all=
ows. I am</DIV>
<DIV>>> trying to set it up so I can have pic processor do the swit=
ching 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/ChipEnableLo=
gic.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 th=
e signal I</DIV>
<DIV>>> have</DIV>
<DIV>>> on the Output enable pin. From what I understand it shouldn=
't be</DIV>
<DIV>>> 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 comput=
er I looked</DIV>
<DIV>>> at.</DIV>
<DIV>>> I figured I could use that as a trigger for an interrupt th=
e would in</DIV>
<DIV>>> turn wait a set amount of time and then switch banks. This =
way I could</DIV>
<DIV>>> do</DIV>
<DIV>>> the switching when the chip was not be read from, and so th=
e ecm would</DIV>
<DIV>>> 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 s=
o well</DIV>
<DIV>>> helping me last time, I hope you can do it again. And yes, =
I still</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_ef=
i">http://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_ef=
i">http://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">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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