     $CD42/52546:   Read block from disk

    Jump from $CD56, $CD62:

    CD42: 20 36 CD  JSR $CD36       ; open channel, read block
    CD45: A9 00     LDA #$00
    CD47: 20 C8 D4  JSR $D4C8       ; set buffer pointer to zero
    CD4A: 20 3C CD  JSR $CD3C       ; get a byte from the buffer
    CD4D: 99 44 02  STA $0244,Y
    CD50: A9 89     LDA #$89        ; set read and write flag
    CD52: 99 F2 00  STA $F2,Y
    CD55: 60        RTS

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