Re: 29C256 Flash works great!

[Squash <realsquash@yahoo.com>]

It takes me about 2 minutes to program a 27256.  It feels more like an hour, tho!

Squash

--- "Shawn R. Lin" <slin01@mail.orion.org> wrote:
> WEG1192@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
> 
> 
> 
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=====
Trains, Trucks, and EFI at http://www.trailrunners4x4.org/users/realsquash

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