Processor Technology Sol-PC, Руководство пользователя

Страница: 130 / 284

PROCESSOR TECHNOLOGY CORPORATION
Sol OPERATING PROCEDURES SECTION VII
VII-22
7.7.4 ESCAPE Key
Pressing ESCAPE, shifted or unshifted, generates the ASCII
escape character (1B). The character is displayed.
7.7.5 BREAK Key
Pressing BREAK, shifted or unshifted, forces the SDI output
line to a space level for as long as the key is depressed. No
character is displayed. (Some communications systems use this
feature.)
7.7.6 TAB Key
Pressing TAB, shifted or unshifted, generates the ASCII
horizontal tab character (09). The character is displayed.
7.7.7 Control (CTRL) Key
CTRL, shifted or unshifted, is used with alphanumeric,
punctuation and symbol keys to initiate functions or generate the
characters defined in Table 7-4. Table 7-5 defines the ASCII control
characters. The characters in Table 7-5 are not always displayed on
the video monitor.
A control sequence (e.g., CTRL plus J, which produces ASCII
line feed) requires that CTRL be pressed first and held down while the
other key or keys are pressed in sequence.
7.7.8 SHIFT Key and SHIFT LOCK Key/Indicator
The SHIFT key generates no code and is thus not displayed. It
is interpreted as a direct internal operation, and when pressed
specifically shifts the keyboard from lower case to upper case and from
the lower to upper character on dual character keys as on a typewriter.
The keyboard remains in upper case as long as SHIFT is held down.
Pressing SHIFT LOCK to turn the indicator light on
electronically locks the SHIFT key in the upper case position. Again,
no code is generated and no character is displayed. Pressing SHIFT
returns the keyboard to lower case and causes the SHIFT LOCK indicator
light to go out.
7.7.9 UPPER CASE Key/Indicator
Pressing this key, shifted or unshifted, to turn the indicator
light on activates the upper case keyboard function so that all
alphabetic characters entered from the keyboard, regardless of SHIFT
key status, are transmitted as upper case characters. (Dual character
keys, however, do respond to the SHIFT key.) With the indicator light
on, the Sol keyboard essentially simulates a teletype (TTY) keyboard.
Pressing UPPER CASE to turn the indicator light off returns the
keyboard to normal SHIFT key operation.