David Davies wrote:
> Just started on a game for the 2600 based on the 1977 arcade game,
> Depthcharge (well, okay, it's a straight port with added game variations).
> It's my first attempt at taming the 2600, so please be gentle :-)
Welcome!
> I've been doing some thinking as to what needs doing on the game. I
> definately need a random number generator. Is there a way of doing that on
> the 2600?
This is as simple as it gets:
RAND_EOR_8 = $8E; or 95,96,A6,AF,B1,B2,B4,B8,C3,C6,D4,E1,E7,F3,FA
NextRandom SUBROUTINE
lda random
lsr
bcc .skipEor
eor #RAND_EOR_8
.skipEor:
sta random
rts
Just make sure that you initialize random with a value != 0 at
startup.
Have fun!
Thomas
_______________________________________________________
Thomas Jentzsch | *** Every bit is sacred ! ***
tjentzsch at web dot de |
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