$D552/54610:   Get track and sector numbers for current job

Jump from $D54A, $D572:

D552: A5 F9     LDA $F9         ; buffer number
D554: 0A        ASL             ; *2
D555: AA        TAX             ; as index
D556: B5 06     LDA $06,X
D558: 85 80     STA $80         ; track
D55A: B5 07     LDA $07,X
D55C: 85 81     STA $81         ; sector
D55E: 60        RTS

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