Easiest groups/lineages of machines to port software between?

[Dave Britten]

(05-10-2015 10:13 PM)Csaba Tizedes Wrote:  

(05-10-2015 09:17 PM)Dave Britten Wrote:  going from 32Sii to 35S is relatively painless.

I have a hydrostatics example where the program code totally same for the two calculator and the 32Sii can to SOLVE that program and after few seconds gives a result but 35s can't.

Now that's interesting, though I guess not totally surprising, given all the other, let's say, "quirks" of the 35S.

And I forgot that the 35S changed the indirection register setup, so there's a potential incompatibility.