$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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