[Diy_efi] Another Eprom Question

[mbelloli at speedymotorsports.com]

     Ok, I just checked that the access times.  The stock original chip
had no better than a 150ns access time.  My 29C010 has a 70ns access
time.  So I've got that covered.  I'm better than 1/2 the original
access time.
 Mab
> 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.
>
>
> -------Original Message-------
>
> From: mbelloli at speedymotorsports.com
> Date: 01/25/05 20:00:42
> To: A list for Do-It-Yourself EFI
> Subject: Re: [Diy_efi] Another Eprom Question
>
> I sure hope not!  I'm really trying to get this all set up to do minut
> changes on the fly.  I need an eeprom to be able to do that.  Soon enough
> here I'll have it so I just am changing a small part of the whole program
> instead of the whole thing.  I want to be able to make changes to the
> fuel
> table, and spark table while driving.  Not just switch out one chip for
> another.
> Thanks,
> Marcello
>
>> wonder if part of the problem isn't the 29C010...  I'd try it with a
>> 27C010
>> and see if you have the same problem...
>>
>> -------Original Message-------
>>
>> From: mbelloli at speedymotorsports.com
>> Date: 01/25/05 18:17:19
>> To: A list for Do-It-Yourself EFI
>> Subject: Re: [Diy_efi] Another Eprom Question
>>
>>      That is basically what I have now, but it is setting the check
>> engine.  And you will have basically a prom error, and the vehicle
>> running off something other than the chip.  It runs like crap.  This
>> is in a 1993 Acura Integra with a GSR motor, and a p28 computer.
>> Stock came with a 27C256.  It already had an eprom in it.  Now it
>> doesn't do it every time.  I like every third time it will set the
>> check engine lamp.  you'll have to clear codes, or disconnect the
>> battery to get it running correctly again.
>>
>> Thanks,
>>
>> Marcello
>>
>>>  Back in 87 I was running a 27C512 with 4 programs on my Buick GN...
>>> had a small board the chip was on and a shielded ribbon going to the
>>> ECM.
>>> would toggle the 2 highest address bytes with a thumbwheel on the dash
>>> to
>>> change banks and did it on the fly all the time with no CE light.
>>>
>>>
>>> -------Original Message-------
>>>
>>> From: mbelloli at speedymotorsports.com
>>> Date: 01/25/05 15:13:07
>>> To: diy_efi at diy-efi.org
>>> Subject: [Diy_efi] Another Eprom Question
>>>
>>> Hello everyone,
>>> I have been pulling my hair out trying to figure out another one of
>>> these chipping ideas. I am trying to set up a controller to allow
>>> the switching of which chip the ecm of a car computer is running on
>>> the fly while driving. Currently I've got it working very well if
>>> you switch with the key off, but not while running. The original
>>> chip was a 27C256, which switched out for an ATMEL AT29C010. I
>>> really only wanted 4 choices, which this chip more than allows. I am
>>> trying to set it up so I can have pic processor do the switching for
>>> me. I cound't put a picture of the waveform that is driving me crazy
>>> here so I put it on my website at
>>>
>>> https://home.comcast.net/~hexibot43/ChipEnableLogic.htm
>>>
>>> I just can't understand why it is working right now with the signal I
>>> have
>>> on the Output enable pin. From what I understand it shouldn't be
>>> working,
>>> but it is working. I thought I was going to simply look at the signal,
>>> and see drops to ground like I did with the last car computer I looked
>>> at.
>>> I figured I could use that as a trigger for an interrupt the would in
>>> turn wait a set amount of time and then switch banks. This way I could
>>> do
>>> the switching when the chip was not be read from, and so the ecm would
>>> be
>>> happy and not throw an check engine lamp at me.
>>> Can anybody sheld some light on this for me? You guys did so well
>>> helping me last time, I hope you can do it again. And yes, I still
>>> have a lot more to learn.
>>>
>>> Thanks,
>>>
>>> Marcello
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>>
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