[Coco] Tandy Color Computer 3 RND Function

[Walter Zambotti]

Hi (late to the party)

Keep in mind and depending on application it may be a requirement that the random number generator be either deterministic or truly random.

During development it can be very useful to have a sequence of random numbers generated in the same way every single time the program restarts. This really helps with debugging because you are only dealing with one variable (the bug).

How difficult would it be if the bug only revealed itself with a certain random number (or certain sequence) and having to wait for that value to actually arise.

The other time is when using pseudo random number generators for cryptography.

The encryption process needs to be deterministic.

Walter

-----Original Message-----
From: Coco [mailto:coco-bounces at maltedmedia.com] On Behalf Of Allen Huffman
Sent: Thursday, 2 April 2020 11:03 AM
To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
Subject: Re: [Coco] Tandy Color Computer 3 RND Function

> On Mar 27, 2020, at 9:40 PM, Robert Gault <robert.gault at ATT.NET> wrote:
> 
> Allen,
> 
> You probably already know, but just in case when you write your article, don't forget that the Coco RND routine can be found in "Extended Color Basic Unravelled", pg.B-151, $BF1F-$BF76.
> 
> Robert

I started looking at this tonight. Tiny function. I am trying to find a way to copy/paste it from the book rather than retype it, but it copies in columns. I guess it’s easy to type.

I’m going to try to figure out what it does for a blog post. My goal is to recreate it in C so I could have the same algorithm running on an Arduino or whatever.

		— A



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