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initiated from the tape, before further data is
received.
Note: Idle characters are also punched into tape (only) for
the card punch functions of dup, skip and release.
Automatic Ribbon Shift and Line Feed Select (Models
1, 2 and Nl). This provides for ribbon shifting or
single and double line feeding when the control unit
recognizes certain two-character function codes.
These codes, which accomplish ribbon shift up or
down, and single- or double-line feeding, consist of
a prefix code followed by an alphabetic character
(A, B, C, or D).
Audible Alarm (Models 1 and 2). A buzzer in the 1051
is sounded when a condition requiring operator at-
tention (component not assigned or ready, or an in-
terlock) arises within the system during line-loop
operations.
Automatic EOB (Models 1, 2 and Nl). A two-position
switch is provided with this feature, which (when
set to
AUTO)
causes an EOB and CR/LF codes to
be generated whenever the return key ( 1052) is
pressed in either home-loop or line-loop operation.
Home Component Recognition (Models 1 and Nl).
This feature provides for the on-off control of all sys-
tem components (operating in home loop) through
the use of certain two-character codes. These codes
consist of a prefix code followed by a numeric char-
acter (0-9).
Home Correction (Models 1 and Nl). This provides
the operator with an efficient means for error cor-
rection during home-loop operations. Included with
this feature is the punch (normal-backspace) switch,
punch feed button, delete button, and the correct
button.
Keyboard Request (Models 1 and 2). The request but-
ton provided with this feature permits the operator
to place the terminal in a request status during line-
loop operations when it is desired to transmit data
from the keyboard (assignment switch set to send).
When the keyboard is polled, transmission from the
keyboard can start.
Line Adapter (Models 1 and 2). This provides modu-
lator-demodulator equipment (within the 1051) to
permit attachment of the 1050 to customer-owned,
on premise, lines.
Line Correction (MQdels 1 and 2). This provides for
the retransmission of a message following a negative
LRC answer (line-loop operation). Retransmission of
the message up to two additional times following an
error is provided for with this feature.
Line Correction Release (Models 1 and 2). With this
feature, the automatic stop after the third unsuccess-
ful attempt to transmit is bypassed. Instead of stop-
ping at this point, the resend light is automatically
turned off and the reader proceeds to the next
message.
Master Station (Models 1 and 2). When the master
switch, provided with this feature, is on, the terminal
has the capabilities for polling and addressing 1050
terminals on either a multipoint or point-to-point
operation.
Reader Stop-Prefix
I
(Models 1 and Nl). This two-
character code (prefix followed by a
J
character)
stops a reader-skip operation, and permits reading
to continue. This is used for home-loop operation in
program mode.
Telegraph Line Attachment (Models 1 and 2). Opera-
tion of the 1050. system at 8.3 cps over 75 bps tele-
graph facilities (line-loop operation) is possible with
this feature installed.
Vertical Forms Control (Models 1, 2, and Nl). The
controlled movement of forms is provided for with
this feature. This is accomplished through the use
of two function codes and bead chains designed for
each form.
1052 Printer-Keyboard
This printer (Figure 6) accepts data that has been re-
ceived from a remote terminal, CPU, or from the local
keyboard, paper-tape reader, or card reader. Typical
operations of the printer include recording incoming
data, recording data being transmitted to another lo-
Figure 6.
IBM
1052 Printer-Keyboard
11
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