> what exactly is going on when you use a bootloader?
> and is this a difficult assembly language program?

Depends on what you find difficult.

> when you use a boot loader program, there is a programmed delay upon
> power up(correct?), then the program gets loaded into hi memory,
> or somewhere - where the pic uses it upon re-power up, after the delay

There must be some trigger to start the application, for instance
- a time delay without communication, as you mention
- a 'go' command over the comms link
- an inactive comms link (no PC connected)
- a dedicated input pin

> I'd like to right a simple bootloader program, in assembly.

http://www.voti.nl/wloader page contains links to some other
boorloaders.

Wouter van Ooijen

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Van Ooijen Technische Informatica: www.voti.nl
consultancy, development, PICmicro products

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