EPROM emulator

[Ludis Langens]

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.

This sounds like you're thinking of something that plugs into an EPROM
socket and is independent of the target system.

Instead, how about a board with RAM and logic that plugs between a
MEMCAL and a P4 ECM - which uses the P4's CPU and ALDL commands to write
to the RAM.  The MEMCAL doesn't get the processor R/~W signal, but I've
come up with a jumperless solution using a medium sized EPLD.  Of
course, any ALDL based design requires a custom code fragment in the
EPROM.  This may reduce the usefulness of such a board.

-- 
Ludis Langens                               ludis (at) cruzers (dot) com
Mac, Fiero, & engine controller goodies:  http://www.cruzers.com/~ludis/