Mark Command - IBM 5100 Basic Reference Manual

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MARK K-characters,files,starting file Ldev-addressl
MARK COMMAND
You can use the MARK command to initialize one or more tape files to a specified
number of contiguous l,024-byte areas of storage. If end of tape is reached before
the mark operation is complete, the last file number and the number of l,024-byte
areas used in the file are displayed. The ATTN key is not active during mark oper-
ations. If you try to mark a file that is already marked, an error message is displayed
(Appendix B). To continue, enter GO. Note that you must use the scroll up key
to blank the input line before entering GO only in the first two positions of the
line. If you end the operation by entering anything other than GO in positions 1
and 2, the file already marked is unchanged.
Note: If an existing file on tape is re-marked, the original information in the re·marked
file and the existing information in files following the re-marked file cannot be used again_
The syntax of the MARK command is as shown:
MAR K K-characters,files,starting file [,dev-addressl
where:
K-characters is the number of contiguous l,024-byte areas of storage to be used on
the tape.
files is the number of consecutive files to be marked.
starting file is the first (lowest-numbered) file number to be marked.
dev-address is the address of the tape drive in which the file resides. The default
is address E80.
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