SCREEN

Purpose:    Sets the type of display interface.

Syntax:     SCREEN=<[STANDARD|ANSI][FAST|SLOW][DIRECT]>

By default: SCREEN=STANDARD FAST

Note:
     SCREEN=ANSI should be specified for supporting ANSI screen output
standard. In this case, only the console write operations support
ESC-sequences with no keyboard input support of the latter. ANSI.SYS
(supplied with the system) should be used for the full ANSI service. When
writing to the screen, the system either uses BIOS or directly writes into
the video-buffer. The system is forced to write into the video-buffer when
DIRECT is stated and the current video mode number is 3 or 7. The approach
is recommended for the slower machines of the PC XT type. Besides, there is
a possibility of deliberately processing console write system calls with the
mode set by FAST or SLOW. In the first case, output rate is high while in
the second, it is lower, but with no special code taking up additional
memory. The difference in speed is negligible with 386 and higher machines
while quite detectable with XT-type machines.