Re: Memory Emulator (was ASBX code is AMXY)

["Swayze" <kswayze@bellsouth.net>]

are there any details (in archives or posted) for this modification? is a
'727 board capable of the same mods?
byE
Mike
Swayze
mswayze@truswood.com
kswayze@bellsouth.net
----- Original Message -----
From: "John S. Gwynne" <jsg@jsgpc.mrcday.com>
To: <gmecm@diy-efi.org>
Sent: Friday, April 14, 2000 12:01 PM
Subject: Re: Memory Emulator (was ASBX code is AMXY)


>
> |   4. Replace the EPROM on the MemCal with NVRAM (Dallas chip?)
>
> not likely without adding more logic or modifying the board to send
> the Memcal read/write/enable control. There was a big discussion of
> this back when the list first started... along with other emulation
> technologies... worth read once the archives are backup on the website.
>
> 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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