dos33fsprogs/random

Trying to find a good pseudo-random number generator for 6502

I had been using the "random16" one here, but at least on Peasant's Quest
when used to generate a 0-31 random value it seemed to have "0" and "17"
come up way more than exected

the "random8" one here is better, but it's really only 7 bits as you can't
actually generate a 0 and code might fail if you never get a 0 result?