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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.