$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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