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D.4 PURCTIORS OP THB DeS
Display controller subsystem (DCS) is composed of the
following components.
TABLE D-2
Components of the Display Controller
Display ControllerG A
CMOS 5 KG 1 OO-pin flat Package
Video- RAM
16 K bytes
64KRAMx2
CG-ROM
8 K bytes
64 K ROMx1
OSC
CPU-ClK
14.31818 MHz
Others
Multiplexer
74 HC 157x2
latch
74 HC 273x1
Display Buffer
The following table shows the operation modes of the DCS of
the internal LCD and external CRT display.
TABLE D-3
LCD/CRT Operation Mode
Operation
lCD/CRT
lCD/CRT
Resolution
Character Box
Mode
(Pixels)
(Pixels)
40 x 25 TEXT
320 x 200
8x8
80 x 25 TEXT
640 x 200
8x8
320 x 200
320 x 200
8x8
GRAPH
640 x 200
640 x 200
8x8
GRAPH
D -
9
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