IEEE-754 conversions for the HP 48/49G series

IEEE-754 v1.2
A Conversion Library for the HP 48/49G
$Id: ieee.htm 1.1 2001/11/16 21:19:02 Detlef Exp $

Being a programmer w/ emphasis on data collecion and processing, I need from time to time to take a look at how floating point numberes are represented in a system (ie. their bit pattern). Due the lack of sufficent programs on the net I came up with the IEEE-754 library, it contains conversion routines between real/int and 32/64 bit floating point numbers as described in IEEE-754 1985.

In the archive you will find the following files:

IEEE.HTM	this description
IEEE-48.LIB 	the IEEE-754 library compiled for the HP48G
IEEE-49.LIB 	the IEEE-754 library compiled for the HP49G
ieee.s		the IEEE-754 library source code
mkieee.cmd	batch job to build the IEEE-754 library

The souce code can be compiled using the batch job on a PC with the HP tools v3.0 installed.
The library ID is 1001 and the featured commands are:

->DBL		( % | Z --> HXS )	convert a real or zint to a bint in 64 bit IEEE format
DBL->		( HXS	--> % ) 	convert a bint in 64 bit IEEE format to real
->SGL		( % | Z --> HXS )	convert a real or zint to a bint 32 bit IEEE format
SGL->		( HXS	--> % ) 	convert a bint in 32 bit IEEE format to real

The commands handle de-/normalized, NAN, infenitive, overflow, underflow conditions. Please see the source code for more information.

A very good page with IEEE-754 references can be found here .