29C256 Flash works great!

[Programmer]

Very cool--and the price is right, too !! Never realized the pin for pin
match.
Lyndon.
-----Original Message-----
From: Shawn R. Lin <slin01 at mail.orion.org>
To: gmecm at diy-efi.org <gmecm at diy-efi.org>
Date: September 15, 2000 12:17 AM
Subject: Re: 29C256 Flash works great!


>WEG1192 at aol.com wrote:
>>
>> How does this differ from a ROM emulator? If I understand this flash
device,
>> you still have to pull the chip, and fast erase/reprogram without the 15
>> minute EPROM erase step?
>
>John,
>The flash chip is very different from a ROM emulator:
>1) The flash chip is nonvolatile - remove power from it, and the
>contents are still there.
>2) It cannot be updated or changed "on the fly".
>
>Also since the P4 ECM's don't support writing to flash chips, the chip
>also cannot be programmed in the car.  I suppose a very enterprising
>individual could probably connect the /WE (Write Enable) pin to
>something in the ECM and write a program that allows updates through the
>ALDL though.
>
>So yes, you are absolutely correct that you do still have to pull the
>chip, but it can fast erase/reprogram without the 15 minute EPROM erase
>step.  I believe erasing is probably nearly instantaneous taking only a
>few milliseconds.  I think it also programs a LOT faster compared to an
>EPROM.  I can't remember how long it takes to program an EPROM, but this
>flash chip was completely programmed as soon as I pressed the ENTER key
>(1 second or faster).  Probably worth the $4, IMO!
>
>Shawn
>
>
>
>________________________________________________________
>                           1stUp.com - Free the Web
>   Get your free Internet access at http://www.1stUp.com
>---------------------------------------------------------------------------
-
>To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes)
>in the body of a message (not the subject) to majordomo at lists.diy-efi.org
>

----------------------------------------------------------------------------
To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes)
in the body of a message (not the subject) to majordomo at lists.diy-efi.org