     $CDA3/52643:   B-E block execute

    CDA3: 20 58 F2  JSR $F258       ; (RTS)
    CDA6: 20 36 CD  JSR $CD36       ; open channel and read block
    CDA9: A9 00     LDA #$00
    CDAB: 85 6F     STA $6F         ; address low
    CDAD: A6 F9     LDX $F9         ; buffer number
    CDAF: BD E0 FE  LDA $FEE0,X     ; buffer address high
    CDB2: 85 70     STA $70
    CDB4: 20 BA CD  JSR $CDBA       ; execute routine
    CDB7: 4C 94 C1  JMP $C194       ; done

    Jump from $CDB4:

    CDBA: 6C 6F 00  JMP ($006F)     ; jump to routine

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