Emulators, EconoRom III

[spidy]

try 10-20k resistors on the chip and output enable to ground.

----- Original Message -----
From: "Mark S. Riley" <turbotuneusltd at triad.rr.com>
To: "GM-ECM List" <gmecm at diy-efi.org>
Sent: Monday, February 19, 2001 2:36 PM
Subject: Emulators, EconoRom III


After the glowing endorsements about the Intronics Emulator package, I
bought a Tech-Tools EconoRom III. I got it about last Thursday. An
electronics repair tech I know made me a 28 to 24 pin adapter socket. Had to
change out the eprom socket in the ECM so the emulator adapter could plug in
with a good connection. Saturday got to mess with it for a while. Trying to
use it on a 1227148 in a Buick GN first as I'm more familar with them than
others. I also got the power pack to supply power to the emulator when the
target, the gm ECM is off. Never got it to run. Turn on the key and would
have a normal check engine light for about 1 second and then it would flash
rapidly like there was no chip. I didn't even try to hook up another laptop
with Direct Scan to see what it might show.I think I need to do the "reset"
to the cpu input or the reset chip? Anyway, there is a whole list of things
or places that the reset might be hooked up to so the reset can be forced. I
am assuming this is like a "sync" process. Anyone have any suggestions? I'm
not am EE for sure. I can't even tell for sure which chip in the 1227148 is
the main cpu.

The other thought that I had is that perhaps I should turn off the checksum
check. I just had a flash thinking about it this morning. No, I can't say
why I think I should do this now but this morning my reasoning made a lot of
sense.  The calibration runs the car fine from a chip on the same ECM so I
know we didn't mess it up changing the socket. The calibration downloads and
verifies in the emulator seemingly fine. Tried to "read" the "emulated file"
out of the emulator on the Pocket Programmer and it looks as if it reads and
checks a byte at the time. Returns all 00 or FF when we tried that. The
fellow who made the adapter and modified the ecm, Randy Martin, had a pretty
good sounding theory for why the emulator won't read to the programmer. And
I can't remember that one either. I must try to remember to renew the foil
lining on my CSH. The thoughts are getting away too easily.

Anyone have any thoughts, conjecture or possibly know what I should do at
this point.

Mark

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