> > Once they were a sort of version number, so I put them in
> > the source code
>
> That's an option I may use. Org the code to start at 0x200 and
> hide it with CP_75, which will return 00 for the locations from
> 200 to 7FF when read. ID and product notes (and possibly even
> phoney code) can go in the readable lower 1/4 of program memory

I suppose you could do that.  I meant that I specified the ID location
values in the source code, not used regular program memory as ID
locations.  If I remember right, the ID locations can always be read
regardless of code protection.


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