HP-41: Formula Evaluation ROM

[gjmcclure]

(06-07-2017 02:33 AM)Gene Wrote:  So what limits ?

24 character alpha or is that removed ?

Pending operations?

How to scroll to replace a value ?

Gene,

Alpha register is used, yes 24-char limit on formula. However supported functions will be abbreviated to 1 to 3 chars (i.e S for Sine), up to 9 digit integer values allowed in functions, function precedence (^ over * / and MOD, * / MOD over + -), parenthesis used to override precedence.

For this version we did our best to allow the 24 characters to yield the most formula, there are more steps to be taken in future versions of this. One trick explained in the manual to extend the formula will be to use part of the equation, save the result in Y instead of X (and yes the result can be saved to X, Y, Z, T, or L). Then complete the equation using Y for the previous partial result.

Not sure what you mean by limits, but any calculation limits would be the same limit of the function/operation chosen (i.e. for Sine the parameter can be any value Sine accepts on the 41).

Formula replacement is just to put another formula into the Alpha. The EVAL functions will be programmable, so support for storing and recalling the formula to a set of registers is done. A formula creation function is available to make easy formulas. Some example functions will be included on the ROM in FOCAL, i.e. quadratic formula.

I am currently trying to break the release candidate version Angel last sent me, so far, so good!

Greg