Controlling the credits display

To display the credits on-screen, see displaying credits.

You should let the system ROM be in charge of controlling the credits displays. But if you want to try things, here's how it goes:

See the bit definitions of the and  registers for more details.

The system ROM uses ~35us delays done with fall-through calls to NOPs.

Credits for P1 are in D0, for P2 in D1.