Re: Memory Emulator (was ASBX code is AMXY)

["nacelp" <nacelp@bright.net>]

Eeer, well, having seen John's ecm, it is very slick, and looks at least as
good, as if it was of oem manufacture.  Also, I been playing with
breadboards, soldering for a long time, and John's work is something that I
wouldn't even attempt.   I'm sure there are lots of guys around here that
can deal with SMT stuff, just that for us 11+ fingered types, don't try this
without adult supervision <g>..
Grumpy


> The '730 had provisions for an extra RAM chip that makes adding NVRAM
> in place of the EPROM easy... on the main PCB not the MEMCAL. I
> started out with wanting to do it on the MEMCAL too, but it didn't
> take long ohming out traces to see the board modification was much
> easier. My ECM has only two visible external modifications; two
> switches... one two disable NVRAM writes, the other to switch between
> EPROM and NVRAM. On the PCB, I stood-off the NVRAM chip in the extra
> RAM's location.... All but 6-8 pins aligned. A few wires, and it was
> done.  Ok... maybe not that easy... but close...
> | So, that's the theory! Now I'm off to modify my ASBX/AMXY, etc. code
> I've been running my '730 that way for about a year now without
> failure. The axxc bin that I have made available
> <ftp://jsgpc.mrcday.com/pub/gmecm/axxc.S_032000> has my ALDL
> modifications; ALDL mode 11. This modification will let you modify any
> address with the engine running or not. I would hope that this is a
> good starting point for other bins with similar ECM boards.
> john gwynne


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