Hi Carl,

> Thank you for your detailed analysis of the situation.  I have to
> admit that we have different goals or that I don't understand the
> problem.  I'm willing to believe that it's that I don't understand,
> but I get the flavor that you are shooting for a solution which uses
> the actual chip in the Arduino Uno and want to be able to recover
> its original operation.

All of my arduino's have SMD chips. I could not replace them, not even
if I would need to.

> I had hoped for a solution where the original ATmega328P is removed
> from the board and replaced with another 328P already programed for
> AmForth.

Since the arduino provide the ISP pins for in place programming (a 2x3
pin header), I see no need to physically replace the chips. All that
differs is software and it can be changed any time. You need
a ISP capable programming device (e.g. another arduino with an
ISP-MK2 sketch or a real programmer like the AVR ISP MK2 from Atmel).

There's no rocket science involved.

> I appreciate your interest and would be pleased to hear your take on
>  removing the existing 328P and replacing it with a pre-programmed
> Forth chip. I would think bootloader considerations would go away
> under these circumstances.

The bootloader can easily re-programmed with the Arduino IDE (there's a
menu option for it). All you need (again) is a programming device. And
after that, your arduino works as nothing has happened at all.

Matthias



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