Table of Contents
Advertisement
2 .1
TAPE DRIVE
The specifications of the tape drive are as follows:
1. Weight: 911 lbs.
2.
Dimensions: 2 9 - l/4 M deep x 69" high x 2 8 -1 /2 " wide.
3.
Voltage: 208 three phase.
4.
Vacuum: 8" water.
5o Power requirements: 1148 watts average (about 1400 watts during high-speed
rewind).
2 0 2
TAPE
The physical medium upon which binary information is stored is a layer of mag
netic oxide material coated on one surface of a plastic tape.
1/2 inches wide and is arbitrary in length up to 2400 feet wound on a reel 10-1/2
inches in diameter.
The specifications on the physical size of tape are as follows:
1.
The width is .498" ± .002" at 50% relative humidity and 70°F temperature.
2.
The total thickness is .0022" (+.0003", -.0 0 0 4 ").
3.
The cellulose acetate base is nominally .0015" thick; the magnetic layer,
. 0006" thick.
The magnetic oxide tape used in EDPM equipment is of the highest quality manu
factured.
The control and care in the manufacturing of the tape is carefully super
vised by the manufacturer.
the customer 0
The aim of this intense effort is to eliminate any conditions leading to an error in
the recording of information or in the reading of information when using the IBM mag
netic tape equipment
2.3
HUMIDITY CONSIDERATIONS
The tape is cellulose acetate.
insofar as relative humidity is concerned. In the range of 20% to 80% relative hu
midity, the lateral dimension can change as much as .0067 inches; operation beyond
this range introduces even greater changes.
sents a problem of storing and using the tape on the 727 when the relative humidity
varies over a wide range.
pends upon the width of the tape. A change of . 006 of an inch may cause misalign
ment errors.
Proper storage of the reel of the tape is, therefore, necessary to obtain satis
factory perform ance. If the tape is stored where the humidity ranges between 40% to
60% relative humidity, the design tolerances are maintained. If the tape is stored in
an atmosphere outside the specifications, the probability of errors increases.
2 .0
MACHINE SPECIFICATIONS
Each reel is tested twice by IBM before it is shipped to
This plastic material is dimensionally unstable
This change in lateral dimension pre
The accurate guiding of the tape to the sensing heads de
8
The tape is nominally
Advertisement
Table of Contents
