     $CD5F/52575:   U1, Block read without changing buffer pointer

    CD5F: 20 6F CC  JSR $CC6F       ; get parameters of the command
    CD62: 20 42 CD  JSR $CD42       ; read block from disk
    CD65: B9 44 02  LDA $0244,Y     ; end pointer
    CD68: 99 3E 02  STA $023E,Y     ; save as data byte
    CD6B: A9 FF     LDA #$FF
    CD6D: 99 44 02  STA $0244,Y     ; end pointer to $FF
    CD70: 4C 94 C1  JMP $C194       ; done, prepare error message

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