[A83] Re: Random numbers

To: assembly-83@lists.ticalc.org
Subject: [A83] Re: Random numbers
From: Peter-Martijn Kuipers <hyper@hysoft-automation.com>
Date: Fri, 10 Aug 2001 15:06:46 +0200 (CEST)
In-Reply-To: <200108101204.1638@lh09.opsion.fr> from "Guillaume Hoffmann" at Aug 10, 2001 02:08:24 PM
Reply-To: assembly-83@lists.ticalc.org


Depends on what you need, if you only need an 8-byte integer, you can use 
the 'r' register, which is normally (not in the 83(+,SE)) used for dynamic memory refresh, but contains a pseudo-random number based on the amount of clock-cycles ran.
you can use it only with ld a,r and ld r,a (no use in the latter)
if you have a fixed number of clock-cycles between each read (if you don't wait for user input or let a wait routine depend on an arbitrary changing mem address), though, you will have the same difference between the reads.

e.g.
1 - 6
63 - 9

--(Peter-Martijn)

 
> 
> What is the best random number generator routine , in terms of 
> effectiveness and speed ?
> 
> TruRand seems to be slow (it uses OPs), and I can't paste Joe Wing's 
> random numbers routine (that is used in Ion and Zlib) in my program.
> 
> 
>  
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References:

[A83] Random numbers

From: Guillaume Hoffmann <crono@ifrance.com>