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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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