Emulator gone bonkers

[David Papworth]

As it happens, I was looking at the literature for this product today,
and didn't understand the rationale for the following paragraph,
taken from the same website --

"To use a Pentium computer you with the PRO-SERIES EPROM EMULATOR or EEPROM
PROGRAMMER you may need to change your I/O configuration BIOS setup. What
you want to do is select the Parallel Port Mode option which allows your
parallel port to perform as an AT or XT parallel port. If this does not
work, you will need an old XT/AT type Parallel port card. These products
need real time access to the Pentium CPU and must use an XT/AT type I/O
card."

Huh? A reasonable real-time update emulator should use some flavor of dual
port
ram, or at least an on-board microcontroller to cycle-steal the updates. It
should not need a constant umbilical cord back to the host. It shouldn't be
at
all sensitive to parallel port speed, within reason. Why should
a "professional" rom emulator ever "need real time access to the Pentium
CPU"?

Is it possible that this product freaks out if the host CPU goes off-line?
Perhaps your laptop hard-drive hick-ups under the G-loading at the
track, causing the OS to stall for a long period, and depriving the
emulator of its "real time access to the CPU".

You might try downloading the rom image to the emulator pod, and then
disconnecting the parallel cable (try this in your driveway first). If the
ECM
dies, you can suspect the emulator. If the program keeps running, try it
at the track running that way (with the host disconnected).


----- Original Message -----
From: "Keith" <kgil1 at tampabay.rr.com>
To: "A GM ECM mailing list" <gmecm at diy-efi.org>
Sent: Thursday, November 30, 2000 2:28 AM
Subject: Emulator gone bonkers


> I had a weird experience with the EPROM Emulator that i bought from
> http://www.ldti.net/epm_emu.htm.
> I hooked up the Emulator to a 92 Typhoon and it was running fine when
> testing it on the street but when I tried to run it at the track it
> crapped out on me. It seemed like it lost the program, i resent the file
> to the eprom and it ran well for a couple of minutes and then dropped
> again.
>
> Is it possible that something was interfering with the Emulator at the
> track?
>
> After a crappy run down the track, I resent the bin and tested the truck
> out in the street and it was fine. I did 3 launches without a problem.
>
> Has anyone else ever come across this problem?
> Thanks.
> --
> Keith F.A.S.T.
> Riverview, FL
> '91 GMC Syclone #2173
> '75 Oldsmobile Hurst/Olds
> '92 Nissan Sentra SE-R
> http://www.syty.net
> Direct Forum link -->>>
> http://www.syty.net/cgi-bin/Ultimate.cgi?action=intro
> See my homepage at  -->>> http://home.tampabay.rr.com/keith455
> --------------------------------------------------------------------------
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