I wrote:
> Now, in the table-less solution, I'm taking this concept a bit further:
>
> lda SWCHA
> tay
> eor last ; 01 or 10 (else: abrupt twist)
> sty last
> dey ; -> y = -1..2
> cpy #2
> sbc #1 ; -> a = -1, 0, 1
> beq .right
> .left:
Correction:
As you might have already noticed, there is a litte bug in the code:
After LDA SWCHA I forgot to mask out the upper bits (AND #%00000011).
BTW: That also makes my attempt to use my favourite illegal opcode LAX impossible ;-)
Have fun!
Thomas
_______________________________________________________
Thomas Jentzsch | *** Every bit is sacred ! ***
tjentzsch at web dot de |
____________________________________________________
Berufsunfähigskeitversicherung von Mamax bei WEB.DE.
Jetzt informieren! http://bu.web.de
----------------------------------------------------------------------------------------------
Archives (includes files) at http://www.biglist.com/lists/stella/archives/
Unsub & more at http://www.biglist.com/lists/stella/
