Cathode Ray Tube Equipment - IBM 709 General Information Manual

I
Printed
I
Data
/ 1
.11
I Data to be
. ..
...
.
'
.
.
Printe
y
Printer
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lfl/
Figure 94. Printing from Core Storage
eluding numerals, alphabetic symbols, and special
characters. Information is printed at the rate of 150
lines per minute with as many as 120 characters per
line. The print format and arrangement of the data
to be printed are controlled by the stored program
and a control panel located on the printer. Use of the
proper stored program enables the printing of any
desired information in any form convenient to the
programmer.
Figure 94 shows a report as it appears in core
storage and as it would appear being printed on the
716 Printer. The choice of which type wheels to use
in the actual printing would be decided by the control
panel wiring on the printer.
The
IBM
709 Data Processing System uses one
printer attached to data channels A, C, and E. The
IBM
7090 Data Processing System may have a total of
eight printers, one attached to each data channel.
With all systems, the 716 Printer supplies the power
for both the card reader and the card punch and,
therefore, each set of card equipment must be attached
to one data channel.
Cathode Ray Tube Equipment
Visual display of processed data is provided by' a
cathode ray tube display unit. Numbers are con-
verted into alphamerical characters, curves, or any
type of visual representation. With this unit, the
actual results determined by the mathematical for-
mula used in Figure I could be used to display the
cross section of the wing design (Figure 95).
Associated with this display unit is a second cathode
ray tube with a camera attached. This unit provides
a permanent filmed recording of the displayed data so
that different designs can be compared and evaluated.
When a character is to be displayed, only 35 posi-
tions of the word containing the character are used.
The sign position is considered positive. The remain-
ing bits signify a display or no-display of a spot, de-
42 IBM 709·7090
Figure 95. Visual Display of Wing Design
pending on whether the bit is a I or a O. The first
column of the character is represented by the first
group of seven bits (following the sign bit); the sec-
ond column, by the second group of 7 bits, and so on.
The first bit of each group may correspond to the
lowest position of each column; succeeding bits will
move up the column, one bit at a time.
S I
7
14 21
28
35
Figure 96.
CRT
Character Plotting
An example of
CRT
character plotting is shown in
Figure 96. The word responsible for the plot, as it
appears in core storage, is shown above the plot. The
program consists of a write instruction addressing the
CRT
and a copy instruction specifying the storage
location of the word containing the character to be
plotted.
The
IBM
740 Cathode Ray Tube Recorder (Figure
97) is basically a digital-to-analog converter. It is con-
nected to both the 704 and 709 systems. The recorder
contains a seven-inch cathode ray tube as the actual
output device. A camera, mounted over the face of
the
CRT,
produces a filmed recording of the plotted
data.
The
IBM
780 Cathode Ray Tube Display (Figure
98) is connected to the
CRT
recorder and controlled by
it. This unit contains a 21-inch
CRT,
similar to a home
television receiver tube, to provide an immediate dis-
play of the plot being filmed by the 740 unit. The
CRT
display is, in effect, a "slave unit" to the
CRT
re-
corder. The conversion from digital to analog data,