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Old 20 December 2004, 21:34   #1

Photon's Avatar
Join Date: Nov 2004
Location: Eksjö / Sweden
Posts: 4,908
A nice quick small random numbers routine?


Wrote a routine to generate random numbers (0-65535). I start with a weird number for seed, I eor that with another weird number that changes for each time. Then I save the new seed, take it, divide by a weird number and take the modulo. I thought that would confuse it enough to make nice random numbers, but when I plot them a pattern shows up (the same number comes up several times in the number table).

Anybody have a nice little Really Random Number Generator (in 68000 Assembler of course)?

In that case, please share thy knowledge!
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Old 20 December 2004, 22:07   #2
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Codetapper's Avatar
Join Date: May 2001
Location: Auckland / New Zealand
Posts: 3,165
Post Worth a try

Dunno how random this code is but I've seen it (or variants of it) in quite a few Amiga programs. Give it a try anyway:

_RandomWord	bsr	_RandomByte
		rol.w   #8,d0
_RandomByte	move.b  $dff007,d0
		move.b  $bfd800,d1
		eor.b   d1,d0
Obviously d0 contains the "random" word after it's finished, d1 is destroyed.

Last edited by Codetapper; 20 December 2004 at 22:14.
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Old 20 December 2004, 22:56   #3
Mehh :D
lloyd's Avatar
Join Date: Nov 2004
Location: Bristol, SW UK
Age: 58
Posts: 242
May be able to supply something in Z80.... Is it easy to convert Z80 assembler to 68K? Never tried 68K so wouldn't know.
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