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3. Z key and tab key (with each other only); and
4. the two shift keys (locked together).
Note: The alternate coding key must not be pressed simultan-
eously with the numeric key desired. The alternate coding key
is pressed, held down, then the numeric key is operated as
usual. The alternate coding key is then released.
The output from the keyboard is a six-bit (plus a
parity bit) PTT code/6, that is used throughout the
system. See Figure 44.
The outstanding advantage of this component is in
local source recording. When using the keyboard, the
operator can enter data manually to be transmitted to
a central terminal, or to be recorded locally on the
printer, paper-tape punch, or the card punch.
1053 Printer
The 1053 printer (Figure 7) provides printed page out-
put for the 1050 system. The functions of this printer
are identical to the functions of the 1052 Printer-
Keyboard, and the features are similar.
The 1053 printer is used in those configurations re-
quiring a second printing unit and in those configura-
tions not requiring a keyboard. The 1052 printer-
keyboard and the 1053 printer can be separately
controlled. The 1053 printer can be a part of any 1050
system configuration on an optional basis.
Controls incorporated in the 1053 are the Tab, Space
and Return buttons. Also, provided are the left and
right margin stops, plus a set and clear tab key.
Figure 7.
IBM
1053 Printer
1052 Printer-Keyboard and 1053
Printer - Special Features
The special features for the 1052 and 1053 are sum-
marized here. A detailed description is contained in
the Principles of Operation section.
Pin-Feed Platen: Pin-feed type platens are available in
various lengths to accommodate forms with pre-
punched holes. A special extension platen is required
when the vertical forms control special feature is
installed.
1054
Paper-Tape Reader
The 1050 system provides for the entering of punched
paper-tape data during line-loop or home-loop opera-
tions through the 1054 paper-tape-reader. This paper-
tape reader (Figure 8) can be used alone or in combi-
nation with a card reader, programmed keyboard or a
second paper-tape reader. Data read from paper-tape
can be printed locally (but not punched) while trans-
mitting the same data to a central location.
The paper-tape readers are capable of reading chad
(fully punched-holes) paper tape, or chad edge-
punched documents (special feature). The code is six-
bit PTT code/6 with a parity bit (see Figure 44)
punched in one-inch 8-track tape or along the edge of
a document (Figure 9). Reading is accomplished by
sensing pins.
When used with a printer, the paper-tape reader is
interrupted by functions such as tab, CR/LF and line
feed. The reader is also interrupted by a reader-stop
code, by operation of the reader-stop switch, or when
the end of the tape is reached. The operator can move
the tape manually either forward or in reverse without
reading by operating the tape advance wheel.
Figure 8.
IBM
1054 Paper-Tape Reader
13
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