hi,
> 
> So I asked $SEARCHENGINE and found this project. Right now I try to
> make sense of the different links I've got. Unfortunately it is not so
> easy for a newcomer to filter up-to-date info from outdated one.

Can you please give some more details? I try to keep the things
up-to date on the project homepage (at least).

> 
> So I would appreciate a few pointers to help me transforming an
> Arduino mega into my first Forthduino.

That should be easy: just use Linux (any other OS may work
as well but I do not use them), install wine and copy the
Atmel assembler avrasm2.exe together with the AppNotes2 directory
somewhere into your filesystem. Finally install ant (a java build
system, just like make). make may work as well, I did not really
test it for the arduino's.

The next step is some editor work: build.xml or makefile
contain some path definitions, it should be obvious what to do
(we are all developers, arnt we?). Finally run "ant mega.hex"
in the appl/arduino directory and you should get two (or more)
new files that need to be burned with ISP or JTAG onto your
mega arduino board. That ISP thing can be another arduino with
the ISP software loaded, btw.

I found that the arduino mega acts strangly, after burning the
hex files it may be useful to re-connect the USB connector
twice to get the serial connection work, dont ask me why.

> btw (can't wait with questions): 
> * better to start with v4.2 or cvs version right now?

always use a release version, the trunk checkouts can be
buggy. Even more: if one version does not work, some older
versions may do the job, its worth to give them a try, the
changes are all documented, just read them in reverse order.

> * what's the last word regarding fuse settings?

The arduino factory settings do _not_ work, there is  a readme
in the arduino directory, which contains working parameters.

btw: you can destroy your arduino with the wrong settings, be
careful. they can be recovered, but thats really tricky and
requires special prgramming hardware.

Matthias

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