$F24B/62027:   Establish number of sectors per track

Jump from $D540, $D568, $EED2, $F17C, $F204:

F24B: AE D6 FE  LDX $FED6       ; 4 different values

Jump from $F252:

F24E: DD D6 FE  CMP $FED6,X     ; track number
F251: CA        DEX
F252: B0 FA     BCS $F24E       ; not greater?
F254: BD D1 FE  LDA $FED1,X     ; get number of sectors
F257: 60        RTS

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