Hi,

Anyone know a good hardware address or/and routine to use for random ?

I am trying LDA $FE44 but it doesn't seem very random. (saw that in some game)

What I ideally need is a random number between 0 and 'N' as well.

- PJ

You can try combining a load from &FE44 with a circular table of random numbers, e.g.


If you want to limit the number to between 0 and 2^n-1, that's easily done with an AND. If it's a non-power-of-two, e.g. between 0 and 23, unfortunately I can't think of an easier way than:

Thanks for that - the AND trick is pretty neat - I used it in my recent BeebSID game.

I recently used the LSB of the countdown interval timer (wow, I've actually read a manual for this) to pull a random seed for one of my proggies.

lda &02A0

Lets not get too involved in how non-random this is going to be 'cause my program is started at exactly the same nano-second after the computer is turned on each time...

and then for a fast '8 bit' random number;

lsr A
bcs skip1
eor #&B2
.skip1
; random number in accumulator

Courtesy of some Commodore programming website I ran into.