SYSTEM TECHNICAL MANUAL
HARDWARE DESCRIPTION
MONOCHROME CRT
With the monochrome 12-inch CRT, text with 25 horizontal lines
across the screen can be displayed. Each line has 80 character
positions. It also has graphics capability to draw complex pictures.
This graphics capability makes the screen all points addressable
(APA). (640 points horizontally and 400 points vertically.) The
tube uses a green-colored phosphor for a green display on a dark
background. An anti-reflection surface is provided. The screen is
refreshed at 56.2Hz, the horizontal frequency is 23.8k Hz. The
CRT requires a supply voltage of +12Vdc±5% and a maximum
current of 1.5A. Brightness and contrast controls are conveniently
located on the front of the unit, allowing easy adjustment for dif
ferent user’s preference and room lighting.
The dimensions of the character field on the CRT screen are
shown in Figure 2.34.
Figure 2.34 CRT character field
2S5
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