NEW! Created October 6th, 1999.

General notes about Tempest code discoveries:
---------------------------------------------
A search in the code for references to the Pokey interrupt request line 
(#60CE and #60DE) yield no matches. What this means is that the Pokey is
not being used as a timer to start interrupt-driven events.

Although #0100-01FF is reserved for the stack, you'll find direct access
to memory locations in the lower range of the stack for various game
variables.

A player may have up to eight bullets on the screen. There may be up to
seven enemies present on the screen at any one time. There is no easy way
to turn this into a three or four player game. It is certainly possible,
with some effort, to extend the score beyond six digits per player.

A value of #10 is considered to be the height of the top of the tunnel
during normal gameplay.