Design Specification - BJACK

BJACK is a state machine which stores the states that reflect the following conditions:

The value of Score in on of the ranges of 0-16, 17-21, or 22+.

The status of the card reader (card in or card out).

The presence of an ace in the card reader.

On the basis of these stored states, and input from each new card, the controller decides whether or not a +10 or a -10 value is sent to the adder.