Emulator (was EFI control)

[Bill Shaw]

You've got at least one interested,  but it would need to support the '749,  so 128K bits.

1 Flash,  1 static ram, muxes and PIC? I can do the PIC stuff,  I have a PICmaster.  It does get more complicated,  but with surface mount it can still be reasonably sized.

On startup,  copy the flash to ram and run the ecu out of ram.  When changes come in the serial port switch the ecu to flash,  make changes to ram,   then switch the ecu back to ram.

May also be able to interleave PIC and ECU cycles in ram,  so the switching and multiplexing isn't necessary,  I'd have to investigate that more.  If possible it would take some signals from the ECU not available on the prom socket.

bs



Pat Ford  wrote:

>
>  Methinks I'll try to take the lead in an emulator design effort, and do a demo disk type thing ( single floppy works on a old 386 laptop. Who else is interested??
> DIY_EMU ???
>
>  just quick off the top of my head observations
> dual port ram is expensive,
> not all the eprom needs to be emulated
>
>  hows about small d/p ram (16K?) and the rest flash.
>
>  that way you can do the tables fast ( just swap out pages on the d/p ram) and the program is in slow to prgram cheaper flash, that will servive power outages?
>
> Ideas and feedback PLEASE (esp from the EE's)
>
> Previously, you (Bruce Plecan) wrote:
> {
> { All *WE* need is a user friendly cheap emulator and we're there now.
> { With all the hacing, and good editors now, just getting away from having to
> { carry a burner around would about make this a perfect world, IMO
> { Bruce
> {
> {
> { From: "Pat Ford" <pford at qnx.com>
> { > I'm all for CHEAP! the oem ecms are CHEAP, $35 at the wrecker. they don't
> { come as easy to program as the aftermarket stuff but $965 ( guessing at $1K
> { for a cheap aftermarket ecm) buys alot of my hobby time.
> {
>
> - --
> Pat Ford                           email: pford at qnx.com
> QNX Software Systems, Ltd.           WWW: http://www.qnx.com
> (613) 591-0931      (voice)         mail: 175 Terence Matthews
> (613) 591-3579      (fax)                 Kanata, Ontario, Canada K2M 1W8
>

----------------------------------------------------------------------------
To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the quotes)
in the body of a message (not the subject) to majordomo at lists.diy-efi.org