EPROM emulator

[Jason Weir]

jsg at donet.com wrote:
> 
> Do we have enough interest to layout a board that will allow use to
> emulator the EPROM in several ECMs? This could be a group buy much
> like the boards on the efi332 project. I see something that would
> allow us to switch between an EPROM/RAM and RAM (2 banks) with a small
> processor connected to a laptop by RS232. We could, in real time,
> alter the tuning data. Example: with the engine running roll in the
> EPROM (synchronously), write to the RAM, then roll the RAM back
> in. Cost would be on the order of $50 or less. Comments?
> 
> john

Please correct me if I am wrong but I am under the assumption that when
the processor boots it reads the eprom contents into processor space and
for an emulator to be real-time it would have to incorporate some kind
or processor reset line to be triggered before the processor would see
any of the changed data???  Again I have no working knowledge of these
things just my idea of how it works, please correct me if I am wrong,
either way count me in for any help I might be able to give...  Jason