It is close to optimal, but slightly more powerful programs exist today.
It is illegal. That is not my definition of "easy."
No. It is old technology.
But if you must.....
For a good discussion of this already go to rge21.com free blackjack board. Zilog has a 32 bit version of the z-80 ship that will use far less power and has far less rf interference.
This chip is best because it does not use any pre instruction caches, and will stay in sleep, low power mode, more often than more modern ones (though this chip uses other new design tricks that make it very powerful even by today's standards).
Bottom line is not the legality; it is the speed of your playing. Moving your toes is not as fast as using your mind. You can play enough hands per hour more to not only make more money per hour, but to also have more certainty of winning per hour of play.
If you need more power consider some of the non-counting advantage plays instead. There is no room for Cyborg Tim, the toolman, Taylors in the casinos!