Swapping Registers on HP calculators

[n1msr]

Valentin,

Thanks for the extensive follwow-up.

Just a coment on the HP-67: I have Tony Nixon's board in it, which coupled with his PC emulator makes for a convenient development environment, albeit limited to the scope of the 67's capabilitiies. The bluetooth connectivity and turbo mode are fantastic.

Thanks for mentioning the 35s. That is the next machine on which I will implement the Python algorithm, having just worked with the DM42.

I saw your April 1st post - a bit ambitious for me! the GCD thing is, well, interesting/strange!

Mark