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SECTION VII.
TYPES 204B- II, 204B-12 MAGNETIC TAPE UNITS
magnetic tape unit.
To minimize the possibility of error, it is important that the operator
understand the functions of the indicators on the tape unit control panel and how to use the con-
trols associated with them.
Any tape unit which is used only for input should be placed in
PROTECT status to avoid the possibility of unintentionally writing on a tape on this unit.
At
the end of a run, all tapes which are not going to be used during the following run should be
demounted and filed.
Write-Enable Ring
Two provisions are included in Honeywell tape units to prevent erasing or writing un-
intentionally over useful information on the tapes.
Positive protection is afforded in that the
operator must perform two separate actions before a write operation can be initiated:
1.
He must insert the write-enable ring in the supply reel containing the tape
to be written; and
2.
He must place the tape status switch in the PERMIT position.
If either of these actions is not performed, the PROTECT indicator on the tape unit control
panel is illuminated, and the tape on that unit cannot be written.
The write-enable ring is installed in the side of the reel that is nearest the tape unit
when the reel is mounted.
If the tape being mounted is to be written, the write-enable ring
must be installed before beginning the tape mounting procedure.
This is done simply by
orienting the write-enable ring to the correct position and pressing it firmly into place with
the fingers.
No special tools are required.
Standard Power- Up and Shutdown Procedures
In the following procedure, it is assumed that all electrical cables have been properly
connected and secured and that power is applied to the unit.
I.
To cycle-up the tape unit in preparation for a standard tape operation:
a.
Set the tape status switch in the TAPE CHANGE position.
b.
Press the power MAIN ON button.
c.
Press the VACUUM ON button.
d.
Mount the tape reel in accordance with the procedure outlined
below.
e.
Set the tape status switch in the PERMIT or PROTECT position.
The tape drive should then be in a standby condition ready to ac-
cept a peripheral instruction, having tape in the loop chambers,
and the MAIN ON, PERMIT or PROTECT, and VACUUM ON
indicator s illuminated.
2.
To perform a standard shutdown procedure:
a.
Set the tape status switch in the TAPE CHANGE position.
If the
tape is not rewound, a rewind sequence will occur.
At the end of
the rewind sequence, the drive will be in a released condition with
the MAIN ON and VACUUM ON indicators illuminated.
7-4
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