$0234-$0239/564-569:  Kanalstatustabelle

  b0: 1: Daten vom Computer holen (Schreiben)
  b3: 0: EOI (End-Or-Identify)
  b7: 1: Daten an Computer senden (Lesen)

ROM-Reference:

 LDA $0234,X: $8881 $9313 $AD64 $AD85 $AEBE
 STA $0234,X: $91B9 $9323 $932B $98EB $9B97 $9BE1 $A0F5 $A1D2
 STA $0234,Y: $8A46 $8B81 $90A9 $9358 $A0D0 $A0DD $B1FB $B256

 STA $0239  : $B055

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