Eprom Emulation

[andy quaas]

This is a great idea!  You could use 2 SRAMs (or eeproms), run the ECM
off one, then load data in to the other.  It would be hard to do this
with only one sram chip, because the data lines can't run to 2
processors at once...

There would have to be some sorta latches to switch the data lines
between processors...  hmm...

Andy
 
> Didn't catch this the first time it came through...
> A couple things from personal experience with the C3
> and P4...
> On my Buick GN I made a board that had 2 proms on it
> and used a 4066 to
> switch the CE line so you could select whichever
> chip's cal you wanted...
> I used to use it constantly, switching back and
> forth under cruise, idle
> and even a couple times at WOT.
> There was never a hiccup.
> 
> I also had a 93 Jimmy withthe 200HP Vortec 4.3L V6
> and a P4 pcm...
> I had a 6 in 1 JET chip... it was basically a 27010
> chip with 6 programs
> burned into it (top 256K was empty).  The lower
> address lines went to where
> the stock address lines did, and the data lines all
> went to the PCM.  to
> switch programs, all you did was toggle one of the 3
> higher address lines
> to select the 128K bit block you wanted...  How
> about an Emulator that
> follows similar lines?  
> 
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