Simple World Files

-- Simple World 1.0b5 (2011/11/11) --

In this version there are several changes to the CPU. In first
place, the cs (control & status) register is replaced by two
new registers: wc (window counter) and ip (interrupt table
pointer). The old cs register used to store the window counter
and the interrupt table pointer, among other not too usefull
things. With the addition of the wc and ip registers it's
easier to change the interrupt table pointer and the interrupt
table pointer hadn't to be in the first 64KBs of the code.

Other change to the CPU is the addition of the local lr (link
register) register and the convertion of the fp (frame pointer)
register to a local register. So, now there are only 6 local
general purpose registers but in most of the cases when a
function is called no space in the stack is needed.

A important change in the World is that now every unit of time
up to 16 CPU instructions are executed. So, bugs that do more
calculus between actions have some advantage. Other change is
that the food can be rot when is getting old.

Finally, 3 new kinds of mutations are added:
a) partial mutation: only some bytes of the word is mutated.
b) permutation: the bytes of the word are permuted.
c) duplication: the previous word is duplicated.

The database format has changed again, so the database version was
changed to 5.