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backspace-retype and re start- retype methods of
correction (described under Typing E rror Correction
Procedure) may still be used.
controlled by the following keys:
Line Return Key. This key is operative only when the
term inal is in the enter-local or enter-communicate
mode. Pressing the Line Return key immediately
following the operation of the Line Type Key or key
board operation causes the buffer to back up and
erase all characters up to and including the first
character of the present line.
Line Type Key. The Line Type key is operative only * 1 2 3 4 5
in enter-local or en ter-communie ate mode. Operat
ing this key immediately after the buffer is restored
to position 1 by the Enter key causes the buffer to
print out to, and perform, the next ca rrie r return
stored in the buffer,
Subsequent lines may be typed
out by repeated operation of the Line Type key,
which becomes inoperative after typing a character
or reaching the character where the Enter key was
operated.
Enter Key. Pressing this key while in the enter mode
causes the buffer address to be reset to the first
position and the term inal to remain in enter mode.
Edit Error-C orrection Routines
If an erro r occurs in the present line of typing, the
correction procedure is as follows:
1. P ress CR/LF key (moves print element to left
margin and next line).
2. P ress Line Return key to back up the buffer to
the beginning of the line.
3. Rekey the entire line.
If the e rro r is not in the present line of typing,
the correction procedure is as follows:
1. P ress CR/LF key (moves print element to left
margin and next line).
2. P ress Enter key (restores buffer to position 1).
This is the second operation of the Enter key
since this key was operated before typing was
started.
3. P ress Line Type key, advance the buffer line-by
line (by repeated operation of the Line Type key)
until the end of the line to be corrected is
reached.
4. P ress Line Return key.
5. Retype the line in erro r and all succeeding lines
of the message.
The Edit feature is
The stored information can be verified by switching
to local mode and pressing the Bid key or by repeating
the Line Type key operation.
tents of the buffer to be printed. If the message is
correct, switch to communicate mode and press the
Bid key.
Transmission will occur when the terminal
is polled.
Split Friction-Feed Platen
A Split Friction-Feed Platen is available to further
enhance the forms-handling capability of the IBM
2740 Model 2 terminal.
stalled at the plant and must be specified with the
order.
However, the operator can interchange the
split platen with a standard friction-feed platen.
The two sections of the platen may be manually dis
engaged by pulling out on the left platen knob, and
will remain disengaged until this knob is pushed in.
When the platen is split (disengaged), only the right
portion will be indexed by manually operating the
Index key, the platen knobs, or by receipt of line
feed or new line code from the CPU. When the
platen is not split (engaged), both sections are
indexed normally. The platen is split so that 5-1/2
inches of the printing line is available on the left
portion. The print positions that would print
directly on the split in the platen should not be used
since they may not be legible.
machine, this could be the 56th or 57th character.
For a 12-pitch machine, this could be the 67th or
68th character.
The Platen Split indicator light (Figure 19),
is on whenever the platen is in a split condition.
This light may also glow (with less brilliance) when
the standard friction feed platen is substituted for
the split platen. When the Document Insertion fea
ture is operated, the keyboard will lock if the platen
is split.
The keyboard will unlock when the platen
is restored to normal.
NOTE: The Document Insertion feature is a prerequisite when
ordering the Split Friction-Feed Platen feature.
Document Insertion
The Document Insertion feature (Figure 26) enables
the operator to easily insert and position individual
forms to receive all or a portion of the printed out
put. A typical application might be printing on a
continuous-form journal and simultaneously posting
on ledger cards that are manually inserted by the
operator. If the Split Platen feature is installed
and the Document Insertion feature is not in use,
the entire writing line of the typewriter is available
This causes the con
This feature can only be in
For a 10-pitch
Special Features, Model 2
41
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