Drive LED ein-/ausschalten

CBC3: AD 00 40  LDA $4000        b6=0: LED ausschalten
CBC6: 29 BF     AND #$BF
CBC8: 8D 00 40  STA $4000
CBCB: 60        RTS

CBCC: AD 00 40  LDA $4000        b6=1: LED einschalten
CBCF: 09 40     ORA #$40
CBD1: 8D 00 40  STA $4000
CBD4: 60        RTS
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