Undocummented (?) limits for the HP50g

[ttw]

Going through strings is useful, I like it. The only problems seem to be with the relational operators and sorting (same problem probably.) The only real trouble is converting binary integers bigger than 2^38l. I do it in binary by separating the high and low-order bits and combining them later.

There can be some problems with the FLOOR and other functions. I found an ordering that doesn't cause CAS to convert internally. I have a really big fraction nnnnnn/dddddd which I wish to multiply by a big number and take the quotient. I split the formula into Top*Number then result/Bottom then FLOOR. IQUOT and IREMAINDER fail (I think).