Bill Cornutt wrote:
> James,
> I am not going to try to change your mind about having a way to change
> the train id.  And (this may sound cold) I am not interested in
> debating your reasons for you wanting this ability.
> [...]

Thanks Bill, an excellent point of view on simplicity in engineering.
I use this practice already in my professional work; software
engineering.  In electronics I'm a little more relaxed.  Hobbyist.

Though I feel you may have misunderstood; I'm not the one who wants to
do this, I was merely contributing a reply to a reply to the originator
of the question.

The "correct" way as I see it would be to use a PIC that has built-in
EEPROM, but the originator has some 12C509's lying around.  ;-)

--
James Cameron                              (james.cameron@digital.com)
Digital Equipment Corporation (Australia) Pty. Ltd. A.C.N. 000 446 800