==========
   $90
==========
Probably the Intro-Scene-Counter?

- Set in Init to $10

- Used in IntroSpriteDeactivator (has to be #$01)
- Used in the Mainloop (JSR)
- Incremented in "NextStep"

==========
   $E7
==========

- Used in IntroSpriteDeactivator (must not be #$00)

==========
$F4 to $F7
==========

These Registers' contents are stored into the APUregisters ($2140-3) in DerSoundBrei

- $F7 set to $00 in DerSoundBrei
- Is in some relation to the content of $0114 and $0115


==================================================================================================

==========
  $0110
==========

- Gets deformed and turns to value for $F7 in "Twostep"

==========
  $0111
==========

- Set in "F7_And_2143" to #$01, if $2143's Bit 5 is 0.

==========
  $0112
==========

- Gets deformed and turns to value for $F7 in "Fourstep"

==========
  $0113
==========

- Gets deformed and turns to value for $F5 in "WorkingWithF5"

==========
  $0114
==========

- Used in WorkingWithF7; its value has effects on the value of $F7

==========
  $0115
==========

- Used in WorkingWithF7; its value has effects on the value of $F7

==================================================================================================

==========
   $1026
==========

- Used in IntroSpriteDeactivator (has to be #$00)