What is VORANOGE?

It is a port of the Voyagers' Pseudorandom Number Generator to the HP41CX. It could be useful when exactly the same sequence of random numbers is necessary for tests.


Warnings first

Indispensable prerequisite is an HP-41CX either as real machine or running under a so-called "emulator" (one of the CPU-simulating kind). Any former OS of 41C or 41CV will probably fail, highly likely to produce a MEMORY LOST or even worse, alter memory silently. There are no safety measures to prevent you to carry out this misuse.


Intended use

VORANOGE.zip contains two "4k ROM files" in different formats. The .MOD file may be used with V41 -- https://hp.giesselink.com/v41.htm -- and the .BINJFG may be used with Emu41 -- http://www.jeffcalc.hp41.eu/emu41/index.html
See the emulators' description for details how to "plug-in application packs".


What else?

This module comes with only two commands, SEED and RN. SEED stores X in a buffer as sequence start for RN. In case there is no seed when executing RN time serves as seed (some fraction of seconds to be precise). RN computes with the seed a pseudorandom number and sets it as new seed.
Note: the seed buffer is volatile, PACKing or a power cycle (OFF-ON) will flush it.


Few more details

XROM: 18                         
FUNC: 3                          
VERS: FX20                       
IRVC: no interrupt vector
CKSM: 091 (145 dec) ok           
FAT:                             
XROM 18,00  -VORANOGE   B013 * NP
XROM 18,01  RN          B11D     
XROM 18,02  SEED        B10E     
Buffer-ID: 9


The fine print

VORANOGE is published under QPL, the Q Public License V 1.0 -- find it also in VORANOGE.zip