New WP34S unit

[Nigel (UK)]

Release 3921 now uploaded. This flashes the "Too Long Error" message when the key just pressed would cause the number of bits required to exceed the current word size. Let me know if there are any problems.

I think the idea about keeping bits beyond the current word size, but hiding them, is not going to work. Supposing you did 2 5 - and instead of -3 you got 7, because the first 2 was really 12? Or you shift 0110 right by one bit and instead of 0011 you get 1011, for a similar reason? I think that people limit word size because the bits beyond the word size really aren't there in a particular application, and they want to do binary (etc.) arithmetic subject to this restriction.

Release 3921 also includes changes to the V2.2 branch (!) which now allows you to build this ancient firmware once more. It's not ideal to have two such different things in the same commit, but I doubt anyone will mind. I'm not expecting this branch to return to life, but it's nice to leave it in a working state for posterity.

Nigel (UK)