Juniper Systems Allegro DOS Manual User Manual
Page 192
Page 5-32 MS-DOS
❏ Video Map (Text Mode Only): B/W1, B/W2, Gray Scale
This feature controls how CGA colors are mapped to the LCD: black
and white (B/W1 or B/W2) or 16 shades of gray (Gray Scale).
Both B/W settings map the attribute byte for each character on the
screen to either black on white (normal) or white on black (inverted).
Values for the foreground and background attributes are computed
based on RGBI content. The attribute with the highest value is
assigned black and the other is assigned white. In general, lighter
colors map to black, darker colors map to white. These settings apply
to text mode only. Graphics mode is always mapped to shades of
gray.
“B/W1” is more power efficient but it requires that the video stream
used by an application program go through the BIOS instead of being
written directly to memory. Some programs do this and some do not.
“B/W2” requires more processing overhead, but should work with all
application programs because it does not require the video stream to
go through the BIOS. If the application program does not display
accurately with the video set to “B/W1,” try switching to “B/W2.”
❏ Contrast: 0 to 34 to 63 ratio
This field adjusts the LCD character/screen contrast from 0 to 63. The
contrast can be adjusted in the field without getting into the Setup
program. To decrease the contrast, press the GOLD key +
increase the contrast, press the GOLD key +
temperature compensation for the display is set at 34.
❏ Backlight: On or Off
The display backlight can be turned on and off from this field or
directly from the keyboard by pressing the GOLD key +
brightness can also be adjusted (see instructions below).
❏ Backlight Brightness: 1 to 14 ratio
This field adjusts the backlight brightness from 1 to 14. Because the
backlight uses power, set it to the lowest setting that allows you to
adequately view the display.
❖ Note: In some cases, the use of alkaline batteries may reduce the maximum
brightness of the backlight.
❏ LED Brightness: Medium, Dim, Bright
This field lets you adjust the brightness of the LED indicators to suit
the lighting conditions you are working in. In some conditions, they
can interfere with the visibility of the display if they are too bright.