$A3A3 is near start of demo cycle
$A426 after demo player loses single life
$A497 after demo player loses all lives
$9FD3 after user presses key to end demo
$9FCF after user presses button to end demo

$653F: A90185 -> 4C8D65 to skip joystick/keyboard selection
$9FD3: 8D10C0 -> 4C0001 to quit when user presses key
$9FCF: 2043A0 -> 4C0001 to quit when user presses button
$A497: 200CAD -> 4C0001 to quit at end of demo cycle (after player loses all lives)
$A15B: 30 -> 00 to disable sound
$A16A: 30 -> 00 to disable sound
$A17B: 30 -> 00 to disable sound
$A1D0: 30 -> 00 to disable sound