Hi Folks,
    I've just come back from my vacation to be hit with this question. I
believe it is possible but I'm not sure how difficult it is to do. If anyone
has any comments I'd appreciate it.
The Question:
Using a 16F628 (or 16F876 ) can I, load a piece of code into an area of
memory and code protect it. Then at a later stage load some new code into
the remaining memory, which can make calls to the protected code. I know the
bootloaders do something of this ilk but I don't wish to use bootloading - I
need to be able to use a picstart or similar programmer.

I am aware there are issues around the making of the calls etc when
generating/compiling the second batch of code. It is just the feasibility of
the hardware side I'm interested in at the moment.

Slan
John

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