On Mon, 22 Oct 2007 17:48:37 -0700, "Joel Koltner"
wrote:

"John Larkin" wrote in message
.. .
Well, I'd have preferred "quick and clean." We did one box that was
flash based, field upgradable, and it added a lot of hassle, both in
the design and in walking customers through upgrades.

What was the hardware interface?

RS-232 and optionally Ethernet. We wrote a flash upgrade program for
Windows. But our customers may be running Windows, RT Linux, an RTOS,
or a PLC with ladder logic. A physical eprom is easy to explain.

http://www.highlandtechnology.com/DSS/T560DS.html




P.S. -- Remember that discussion we were having about HP-35S calculators? I
found a pretty nasty bug in how it evalutes equations sometimes... for
particular program sequences it evaluates...

-R*X/(X*Q-R)

as

-R*X/([completely different variable than X]*Q-R)

It's probably programmed in Java.

John