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FUNCTIONAL DESCRIPTION
2.11 CRT display function
(Address 00EA
(Addresses 00E1
(Address 00E4
(Address 00E0
(Address 00E5
(Addresses 00E6
(Address 00EC
Data bus
Fig. 2.11.2 CRT display circuit block diagram
2-72
)
16
CRT control register
, 00E2
)
16
16
Vertical position registers
)
16
Character size register
)
16
Horizontal position register
)
16
Border selection register
RAM for display
10 bits
24 characters
2 lines
16
to 00E9
)
16
Color registers
)
16
CRT port control register
7220 Group User's Manual
OSC1
OSC2
Display oscillation
circuit
Display position control circuit
ROM for display
12 bits
16 dots
256 characters
Shift register
12 bits
Output circuit
R
G
B
H
V
SYNC
SYNC
Display control
circuit
Shift register
12 bits
OUT1 OUT2
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