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For a half-tone chromatic display, two chromatic signals of a
primary color and a semi color are required but no combination
is available between a primary and a semi color of same color
type.
Therefore, a display with 27 different colors is possible as shown
in Fig. 1.2.6.
Referring to Fig. 1.2.5, eight different patterns are.selected in
advance on the pallets; therefore, eight colors be selected
differently from the 27 colors.
Option in DISPLAY CONT
VRAM .... Optional chip of 32 KB x 1 for B/W display
1.2.A
KEYBOARD
I/O CONT
KEY
INPUT
—
Sequence of color combination
CPU
CLOCK
- DAT^
/i-------
80A1
-RESi
vKey code
ROM(1KB)
Key dataRAM(64B)
Fig. 1.2.7
Block diagram of the keyboard
27 combinations of 3 colors are
possible as indicated by the solid
line.
KEY BOARD
Key matrix
KDO
O H CM
m
1-12
Pointing device
(optional)
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