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APPENDIX D
DISPLAY CONTROLLER G.A.
D • 1 GEliJERAL
The Display Controller Gate Array is a CMOS type chip with
5,OOO-gate, lOO-pin flat package, and it contains the color
graphics adapter which can control both the external CRT
display and the internal LCD display.
This gate array contains the following functions.
- LCD/CRT control function
- Attribute process function
- Interface with the CPU (I/O bus)
- Interface with the V-RAM and with the CG-ROM
80
51
50
100
1
30
FIGURE 0-1
Display Conroller Gate Array
The detailed description of each pin and signal is also
given here.
The whole system including this gate array is called the
Display Controller Subsystem, and it can control the
following two types of displays.
A) 640x200 dot LCD (Liquid Cristal Display)
B) 640x200 dot CRT <Cathode Ray Tube) Display
Note that the external CRT display unit and the internal LCD
can not be used at the same time, and its selection is
performed by the keyboard operation.
Fn
+
Home
LCD is selected.
Fn + End
•..•• External CRT display is selected.
o -
1
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