Selector Light Pen Feature; Magnetic Slot Reader Accessory - IBM 3270 Operator's Manual

FIELD MARK Key
Pressing the FIELD MARK key displays an overscored semicolon ( -;) when
the A,a/A switch is set to A,a; when the switch is set to A, only the semicolon
is displayed.
Insert (
/a')
Key
On the 3275 and 3277 Display Stations, only the RESET key can return the
display station to normal operation after being in Insert Mode. On 3278
Display Stations, pressing RESET or any key that causes communication with
the host system will return the display station to normal after being in Insert
Mode.
Numeric Lock Feature
The 3275/3277 Numeric Lock feature cannot be overridden if the display
station has a Typewriter keyboard. However, the 3278 Numeric Lock feature
can be overridden by the Typewriter keyboard to enter all uppercase
characters and symbols. This is accomplished by pressing and holding the
Shift (
~)
key and then pressing the desired uppercase character/symbol
keyes).
Selector Light Pen Feature
The 3278 and 3275/3277 Selector Light Pen features operate the same except
that the 3278 has two attention field designator characters, whereas the 3275
and 3277 have one attention field designator character. Both groups of
machines have blank position attention field designators; the 3278 also uses an
ampersand (&) designator character.
For additional information about the 3278 Selector Light Pen feature, refer to
Chapter 4.
Magnetic Slot Reader Accessory
The Magnetic Slot Reader accessory operates differently than the 3275 and
3277 Operator Identification Card Reader feature. For a description of the
3278 Magnetic Slot Reader accessory, refer to Chapter 4.
Chapter 5. Differences between the 3275/3277 and the 3278 5-15