Help w/ EPROM emulator

[Jim Sloan]

Barry,

I believe Joe Gronikowski has used the one from
http://www.ldti.net/epm_emu.htm with some success. He is on the Sy/Ty list.

You have to disable the checksum flag, of course.

Jim Sloan

> 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
>