It is possible to write data into bytes 5/21 of the HDR1 record of an
ANSI tape label. In all, 17 bytes are available. If you write more
than 8 bytes into the record, the 9th byte (Byte 13) must be a period
(".").
For example, to write the string "FRANKSTN COUNCIL" into bytes 5/21, mount your tape and then do this:
FILE FRANKSTN.COUNCIL;DEV=TAPE;REC=-80,,F,ASCII;LABEL=BUDGET,ANS
FCOPY FROM=datafile;TO=*FRANKSTN.COUNCIL
|
where datafile is the name of a disk file. This coerces the string "FRANKSTN.COUNCIL" into bytes 5/21 of the HDR1 record, and it places "BUDGET" into the VOL1 record of the tape.
The "file" and "group" names are right-justified.
| 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 |
| F | R | A | N | K | S | T | N | . | | C | O | U | N | C | I | L |
In order to retrieve the string recorded in bytes 5/21, you must create
a program that uses the intrinsics FOPEN (or HPFOPEN) and
FFILEINFO. The program must do two things:
It must FOPEN (or HPFOPEN) the tape device.
It must employ FFILEINFO with option 45 to retrieve the "file" identifier.
The tape containing such a label must be mounted before you run the program.
