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 $0152-$01D1:   Track 36 Key Sector

 $0152:         1st file to be loaded from disk: [$0152]=0, >2nd: [$0152]=$6B
 $0153-$0174:   Track Keys (~ number of $7B's)
 $016A:         Track 23 Key
 $0175-$01D1:   random dummies?

 ( [$0104-$0145] is 1541 Kernal Stack area )

RapidLok-Reference:

 STA $0152,Y: $0494
 EOR $0152,Y: $049E
 LDA $0153,Y: $04DA
 STA $0153,Y: $04F7
 LDA $0152,X: $0771
 EOR $0152  : $07C8
 STY $016A  : $04A2***
 LDX $0186  : $04A8
 LDA $0187  : $04AB

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