NEC Advanced Personal Computer System Reference Manual page 80

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Controller PCB
Table 3-5 GDC Commands (cont'd)
COMMAND/
DATA BUS
PARAMETER
D7
D6
D5
D4
D3
D2
DI
DO
REMARKS
CSR DISP
Specifies the height
C
0
I
0
0
I
0
I
I
of the cursor and the
PI
CSR
0
0
..
L/R
~
character row.
P2
~BL~
BD ..
CST~
P3
..
CFI
..
..
BL~
SCROLL W
Specifies parameters
C
0
I
I
I
...-RA
for scroll: defines the
PI
A7
A6
A5
A4
A3
A2
Al
AO
starting addresses and
P2
AI5 AI4 AI3 AI2 All AIO A9
A8
lengths of the display
P3
SL3 SL2 SLi SLO
0
0
0
0
areas and specifies the
P4
0
1M SL9 SL8 SL7 SL6 SLS SL4
eight bytes for the
P5
A7
A6
A5
A4
A3
A2
Al
AO
graphics character.
P6
AI5 AI4 AI3 AI2 All AIO A9
A8
P7
SL3 SL2 SLi SLO
0
0
0
0
P8
0
1M SL9 SL8 SL7 SL6 SL5 SL4
CODEW
Writes the character-
C
0
0
I
0
0
0 ... MOr:>-.-
code data into the
PI
C7
C6
C5
C4
C3
C2
CI CO
display memory.
P2
CI5 CI4 CI3 CI2 CII CIO
C9 C8
LOW BYTE CODEW
Writes the low-order
C
0
0
I
I
0
0 "'MOD ...
byte of the
PI
C7
C6
C5
C4
C3
C2
CI CO
character-code data
into the display
memory.
HIGH BYTE CODEW
Writes the high-order
C
0
0
I
I
I
0 ... MOD.,.
byte of the
PI
CI5 CI4 CI3 CI2 CII CIO
C9 C8
character code data
into the display
memory.
3-15

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