V I Deo Mode Selection - Zenith Z-100 Reference Manual

Page 2.14
System Operating Features
Command: Set Video/Scroll
Syntax: V [Mvi d eo otode] [Sscroll mode] [100[ [150[
Purpose: This command is used to set the current video mode or scroll mode.
Use 100 or 150 to determine which hardware mode to use (100 signifies Z-100
bit-mapped graphics with Z-319 bit-mapped video graphics accessory, 150 signifies
IBM PC-compatible graphics). Table 2.3 shows the various video modes obtainable
with the VM command.
Table 2.3. Video Mode Selection
CODE MODE
40 columns x 25 rows, monochrome at the RGB output
40 columns x 25 rows, color at the RGB output
80 columns x 25 rows, monochrome at the RGB output.
Single text pages may be hardware scrolled without affecting other
pages.
80 columns x 25 rows, color at the RGB output.
Single text pages may be scrolled.
320 horizontal x 200 verlical pixels, color at the RGB output.
Text emulation provided for 40 characters x 25 rows.
320 horizontal x 200 vertical pixels, monochrome at the RGB output
40 x 25 text emulation.
640 horizontal x 200 vertical pixels, monochrome at the RGB output.
Software, hardware jump, and smooth scrolling available (see Scroll
command).
80 x 25 text display at the monochrome output.
Example: Vtt6 RETURN
In this example, high resolution graphics (640 x 200 pixels) would be selected.
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