Re: A86: Random Number stuff
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Re: A86: Random Number stuff
In a message dated 1/9/00 2:19:10 PM Mountain Standard Time,
asmti86@hotmail.com writes:
> I'm sure this has been asked before, but I'l ask anyway =) Is there a way
to
> call the rand function from assembly? If so how? All I could find in the
ASM
>
> Studio 3.1 help file was _random, or is that what I should use? If those
> don't work, is there an algorithim that can do this? I just need something
> basic, like a random number 1-9. I could probably (try) to modify it later
> if needed. Any help would be appreciated.
Something like the following is all you should really need:
;Randomization routine by Jimmy Mardell (used in ZTetris v3.0)
PRandom: ; Creates a pseudorandom number 0 <= x < A
ld b,a
ld a,r
add a,a
ld hl,0
ld d,0
ld e,a
RMul:
add hl,de
djnz RMul
ld a,h
ret
This could obviously be optimized if you have a constant range (ie, 0 <= x <
9, and then increase the result to get a range of 1 to 9).
JayEll