| Apocalypse for one joystick

| Joystick one controls the main functions :

| Forward & descend - Stick up
| Backward & ascend - Stick down
| Steer left        - Stick left
| Steer right       - Stick right
| Fire              - Fire button
| Escape capsule    - Stir

| Notes :

| 1) Moving forwards also descends ( like moving
|    backwards also ascends ).

| 2) The steering is slower when the fire button
|    is pressed to allow precise attack runs and
|    speedy U-turns.

| 3) Pushing the stick up/down has the same effect
|    as moving the mouse forwards/backwards. This
|    will only be noticed when at high altitude
|    because of the auto-levelling.

|---------------------------------------------------

| Move mouse pointer left/right
left_pointer_8   = left_1
right_pointer_8  = right_1
| Move it a bit more if not firing
left_pointer_12  = left_1  . ~fire_1
right_pointer_12 = right_1 . ~fire_1

| Move mouse forwards/backwards
up_pointer_8     = up_1
down_pointer_8   = down_1

| Operate all three mouse buttons
middle_button    = down_1
left_button      = up_1
right_button     = fire_1

| Operate keys
down_arrow       = up_1
f12              = stir_1

| Track stir status in flags for use in test mode
setB_1    = stir_1
resetB_1  = ~stir_1
setB_2    = stir_2
resetB_2  = ~stir_2
