NEC Advanced Personal Computer System Reference Manual page 80

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.
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