HP41 Mcode Entrypoint for 'high precision numbers' - Printable Version +- HP Forums (https://archived.hpcalc.org/museumforum) +-- Forum: HP Museum Forums (https://archived.hpcalc.org/museumforum/forum-1.html) +--- Forum: Old HP Forum Archives (https://archived.hpcalc.org/museumforum/forum-2.html) +--- Thread: HP41 Mcode Entrypoint for 'high precision numbers' (/thread-139367.html) |
HP41 Mcode Entrypoint for 'high precision numbers' - PeterP - 07-29-2008 Hi, In PPCJ-V10-N7 Charles Bouldin talks about the normal arithmetic entrypoints ADD2_10 etc. In his first paragraph he also says "... additional entry points for high precision numbers which occupy a pair of addresses exist but will not be discussed here". Does anyone else know about this entry-points and how to use them? Thanks! Cheers
Peter
Re: HP41 Mcode Entrypoint for 'high precision numbers' - Eric Smith - 07-29-2008 Addresses (hexadecimal): ad2-10 1807
Comments from the source code: ****************************************************** Re: HP41 Mcode Entrypoint for 'high precision numbers' - PeterP - 07-30-2008 Thanks Eric! Now I just have to figure out how to use them :-) Cheers
Peter Re: HP41 Mcode Entrypoint for 'high precision numbers' - Eric Smith - 07-30-2008 Yes, 13-digit mantissa. The intent was that they provide more precision for intermediate results in calculations of the elementary functions (trig, logs, exponentials, etc). The extra 3 digits makes a big difference, though it isn't sufficient to guarantee correct rounding for all cases.
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