MTS Volume 4 - Terminals and Networks (3278)

MTS 4: Terminals and Networks in MTS
July 1988
most recent line, overriding any backward displacement. However,
lateral displacement is not affected. Note that any attempt to move the
window beyond the boundaries of the conversation buffer will be ignored.
When the terminal is first powered on, or when the conversation
buffer is emptied via the %EMPTY command, the three-digit window number
is initialized to one. This number is displayed in the lower righthand
corner of the screen (leading zeros are suppressed). If the user has
used a control key or issued a command which moves the window to the
right, the window number will be followed by a space and a horizontal
displacement value. No displacement value will be displayed if the
displacement to the right is zero.
For the purpose of determining window numbers, all lines in the
conversation buffer are assumed to be numbered consecutively, starting
with one. If the last line displayed on the screen is "m", the window
number will be ceiling(m/22), i.e., the smallest integer equal to or
greater than m/22.
Output ____________ Modes
Four output modes are provided: ROLL, LINE, PAGE, and FAST. These
modes may be specified by entering the device commands
%LINE
%ROLL
%PAGE
%FAST
In ROLL mode, each new input or output line added to the conversation
buffer removes the top line from the screen and adds the new line to the
bottom of the screen. Thus, the output appears to be rolling up the
screen. ROLL mode is equivalent to LINE mode with %HIST=22 in effect.
ROLL mode is the default.
In LINE mode, output lines appear in the next available screen line
as they are produced by the system. When the 22nd screen line has been
used, the screen is erased, the most recent few lines in the conversation
are displayed at the top of the screen, and the input/output
process continues at the next available screen line. By default 7 most
recent lines are displayed when the screen is rewritten. The number of
most recent lines displayed may be changed by entering the %HIST=n
device command, where "n" may be any integer from 1 to 22.
In PAGE mode, output lines from the system are written into the
conversation buffer, but are not displayed on the screen until 19 new
lines have been received or until MTS requests an input line. At this
time the last 21 lines in the conversation buffer are displayed and the
system is told to stop the generation of output so that the new
screenful can be viewed. Pressing the PAUSE key will resume the output
of up to another 19 lines.
24 The Ontel Display Terminal