$D55F/54623:   Check for vaild track and sector numbers

D55F: A5 80     LDA $80
D561: F0 EA     BEQ $D54D
D563: CD D7 FE  CMP $FED7
D566: B0 E5     BCS $D54D
D568: 20 4B F2  JSR $F24B
D56B: C5 81     CMP $81
D56D: F0 DE     BEQ $D54D
D56F: 90 DC     BCC $D54D
D571: 60        RTS

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