Memory Emulator (was ASBX code is AMXY)

[mike mager]

Peter,
Thanks for the great reply!

>I still haven't machined those Alfa heads for injectors (but that's
>another story)...

You said it -"that's another story";  yes, but an interesting one;  it's 
always fun to do what the experts say can't be done.


I asked, partly, " . . . is the idea to change the data (tables), but not 
the code?".

You gave integrating insights into what you are doing.


>The idea is that you add to your existing code's ALDL commands, . . .

What?, you do it through through ALDL?  Very practical!  I always have a 
tendency to want to add another PCB and a thick cable, leave the unit 
dangling from the cables with the covers off . . .


>. . . like a Dallas NVRAM chip . . .

I, also, found use for the DS1245Y and family - it worked great for me.


>Now this "ain't rocket science", and it's certainly been done before
>(c/f Kalmaker), but I'm surprised that it isn't done more often.
>Perhaps it's because it requires modification to a standard EPROM's
>code, rather than just tinkering with the tables?

Another good point;  this would eliminate any mucking about for tuning, 
right?  I imagine just 'adjusting' the program to accept table data through 
the ALDL, then never needing to remove the ECM again, right?


>I have been almost totally distracted from this task by writing a 68HC11 
>assembler and a disassembler . . .

I haven't searched yet;  are there no good ones available?


>The NVRAM (Non-Volatile RAM) approach works like this.
[your eight steps]

Yes, very good;  I must admit that I just plain enjoy machines (electrical 
or mechanical).

I'm not driving an EFI rig at present;  if I owned one, would I ever stop 
tinkering long enough to assemble the hardware?  Yours sounds like an 
excellent method of tuning.


>. . . a "high-speed" data link to/from the CPU, and the NVRAM's contents 
>can be updated.

Oh, faster than the ALDL speed?


>A hardware EPROM emulator is really a "sledge hammer" approach to
>modifying tables (IMNSHO!).

Well, the alure is that it is a 'universal' solution - it just plugs in;  an 
integrated solution definitely has benefits.


>Anyone interested in this?

I am, but, alas, driving (temporarily!) with a carb.

Thanks again for the excellent reply!
Mike
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