Help w/ EPROM emulator

[Mike Rolica]

Call me kinda dumb if you please :0)  But what would it take to make an
emulator on a PC via a serial port or parallel port.  I.e. use a bin file
and have a socket plug into the ECM and get the computer to act like a prom
chip?  I would like to know how the actual EPROM works etc.  I know David C
was working on an emulator project... but have not herd much more from it..
I know Bruce Plecan bought an emulator, but he is not at CSH HQ right now.
So my advice would to ask him when he gets back online either from CSH HQ
remote or CSH HQ base <;0)   look, I made a CSH person !!!

Mike Rolica
Meridian Magnesium Products
Strathroy, Ont 
Ext. 260


	-----Original Message-----
	From:	Barry Tisdale [SMTP:btisdale at cybersol.com]
	Sent:	Friday, December 17, 1999 9:59 AM
	To:	gmecm at efi332.eng.ohio-state.edu
	Subject:	Help w/ EPROM emulator

	Does anybody know if there is a 'real-time' PROM emulator out there
that I
	can use w/ my 7749 ECU (Syclone)?

	The emulator vendors I've contacted either have not replied, or not
really
	answered my questions.

	The ECU *will* tolerate switching between PROMs while running via a
	thumbwheel switch (Todd A./Brian G. 10/1 chip).

	If there's no commercial unit out there that will work, I'd like to
put
	together a board that will have a 16k generic 'keep-it-running'
PROM,
	switchable w/ a 16k SRAM which can be loaded &/or modified thru a
laptop
	parallel port.  I only want to change one byte at a time.  Normally,
the
	ECU would run using the SRAM; when writing a new byte, it could
switch to
	the PROM for the few ms needed to write to the SRAM, then switch
back to
	the SRAM.

	I'd rather not reinvent the wheel, so if anybody has done such, or
knows of
	a commercial unit that will do this, I'd *really* like to know about
it.

	Thanks - Barry