IBM 1132 Theory Of Operation page 11

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Carriage Control Tape
The control tape (Figure 1-6) has 12 columnar
positions indicated by vertical lines.
These
positions are called channels. As viewed from
the front of the machine, they are numbered 1
through 12 from left to right. Brush 1 rests
on channel 1, brush 2 on channel 2, and so on.
A maximum of 132 lines can be used for con-
trol of a form, although for convenience the
tape blanks are slightly longer. Horizontal
lines are spaced 6 to the inch for the entire
length of the tape. Round holes in the center of
the tape are pre-punched for the pin feed drive
in the tape sensing mechanism.
Tape Channels. Tape channels are punched to
control various functions:
1.
Channels 1 through 6 are used to stop the
form (skip to) as designated by the pro-
gram. Channel 1 is normally punched for
the first printing line of a form. When the
Carriage Restore key is operated, the car-
riage will automatically seek channel 1 as
a home position.
2.
Channels 9 and 12 are normally used to
sense the location of the form for the pur-
pose of overflow. These two channels may
be used for the same purpose as channels 1
through 6.
3.
Channels 7, 8, 10, and 11 are not used.
1.
6
"T
--,
0
Form: Max. Width when using
0
Forms Tractor 16-1/2 in.
Max. Length 132 Line Spaces
0
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T
--
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O
_i_
...
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Predetermined
Print
Locations
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0
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0
I
.....
-
u
--.
.
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0
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I
I
7
Figure 1-6. Control Tape Punching for Predetermined Printing
Locations
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