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Fig. 6 Anaplot simulation by GT-40
Standard Video Terminal
Simulations run on standard computer-terminal configurations, with no
additional hardware involved, are more practical and useful, therefore, most
‘experiments were carried out with the use of the VT-100 video terminal. The
screen is.horizontally split; the upper part is stable and arranged as shown
in Figure 7, to represent all Anaplot controls and outputs. The lower part is
then used for the regular computer-operator dialog and display of results in a
scrolling mode. VT-100 is not a graphics terminal and its screen resolution
is defined only by the size and spacing of displayed characters. However,
some of its programmable functions have an interaction potential and, with
certain limitations, the terminal can be used for on-line simulations. The
terminal functions and modes of display are controlled and can be programmed
by command sequences of characters entered from the keyboard or transmitted
from the computer. The sequences must start with a special keyboard key,
marked ESC, or with octal 33 transmitted from the host computer. Any
following character sequence is then considered to be a terminal command and
is automatically interpreted as such. Some of these commands control the
position of the screen cursor. Special keyboard keys marked with arrows
generate commands to move the cursor around the screen. Another command
requests a report on the current line-column position of the cursor and the
reported position can then be computer interpreted as needed for the simulated
Anaplot interaction. A few subroutines make it possible to issue needed ESC
commands from any Fortran program and to move manually the cursor on the
Screen, to report any chosen position to the program, to position the cursor
from the program, to draw tables and display numbers or text in specific
positions. A single ESC-code entered at any time while the analytical plotter
Program is active, is buffered and detected on the next entry to the PLOTTER
routine so enabling an indefinite manual roaming with the cursor. Another
ESC-key depression resumes subsequent PLOTTER functions, which then process
information obtained from the operator's choice of the cursor position. The
Structure of the Anaplot version of the PLOTTER routine is as follows:
control of simulation - console switches - X, Y, 2 input - setvo control -
registers — optics — counters.