In a message dated 2/13/00 9:04:47 PM, neophile_17@hotmail.com writes:
> ld a,r ;to find 1 of 7 rand int
> inc a ;1 more inc a for 6, 2 for 5 etc.
> and %00000111
> dec a ;as many decs as incs
In theory, it would work. In practice, though, since the routine is always
called in the same place, whatever register you substitute for r will always
have the same value.
However, if the program involves the constant use of several keys on the
keypad then you could try something like this:
in a, (1) ; scans the keyboard
rlca ; rotates a left once
inc a ; once for 1-7, twice for 1-6, etc.
xor 7 ; now a=semirandom# 1-7
You can control the keyboard input with a "out (1),%xxxxxxxx" command. Keep
in mind that this isn't truly random in most situations. You're better off
using Jimmy Mardell's routine from ZTetris.
-- Jonathan Marcus