     $D58A/54666:   Write block

    Jump from $EF37, $F001, $F09C:

    D58A: A9 90     LDA #$90        ; code for write

    Jump from $D03F, $D588:

    D58C: 05 7F     ORA $7F         ; drive number
    D58E: A6 F9     LDX $F9         ; buffer number

    Jump from $DC3D:

    D590: 8D 4D 02  STA $024D

    Jump from $D472, $DF42:

    D593: AD 4D 02  LDA $024D       ; command code
    D596: 20 0E D5  JSR $D50E       ; check track and sector

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