$A8-$BA/168-186:  Sekundaeradressentabelle

  b0-3 Kanalnummer fuer die Sekundaeradresse
  b76= 00: Lesen
       01: Lesen/Schreiben
       10: Schreiben

ROM-Reference:

 LDA $00A8,Y: $9B31 $9BE7
 LDA $A8,X  : $8A37 $9037 $904B $91A7 $9274 $99A1 $9CF9 $A81B $B117
 STA $00A8,Y: $9B36 $9BEE
 STA $A8,X  : $8A3B $916D $91B3 $98F4 $B02E

 STA $B7    : $B04D

 STA $B8    : $B049

 LDA $B9    : $87DB
 STA $B9    : $87E1

 STA $BA    : $87DD

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