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Annotation of researchv10dc/dist/man/v4/man4/pc.4, revision 1.1

1.1     ! root        1: .th PC IV 10/15/73
        !             2: .sh NAME
        !             3: pc  \*-  PC-11 paper tape reader/punch
        !             4: .sh DESCRIPTION
        !             5: .it Ppt
        !             6: refers to the PC-11 paper tape reader or punch,
        !             7: depending on whether it is read or written.
        !             8: .s3
        !             9: When
        !            10: .it ppt
        !            11: is opened for writing, a 100-character leader
        !            12: is punched.
        !            13: Thereafter each byte written is punched on
        !            14: the tape.  No editing of the characters
        !            15: is performed.
        !            16: When the file is closed, a 100-character trailer is punched.
        !            17: .s3
        !            18: When
        !            19: .it ppt
        !            20: is opened for reading, the process
        !            21: waits until tape is placed in the reader and the reader
        !            22: is on-line.
        !            23: Then requests to read cause the characters read
        !            24: to be passed back to the program, again without
        !            25: any editing.
        !            26: This means that several null leader characters
        !            27: will usually appear at the beginning of the file.
        !            28: Likewise several nulls are likely to appear at the end.
        !            29: End-of-file is generated when the tape runs out.
        !            30: .s3
        !            31: Seek calls for this file are meaningless.
        !            32: .sh FILES
        !            33: /dev/ppt
        !            34: .sh BUGS

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