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Controller PCB
Table 3-5 GDC Commands
COMMANOI
DATA BUS
PARAMETER
07
06
05
04
03
02
01
DO
REMARKS
SYNC SET
Sets parameters for
C
0
0
0
0
1
1
1
DE
synchronization of
PI
0
0
CHR
F
I
0
G
S
signals.
P2
..
C/R
..
P3
~VSL
.. ..
HS
..
P4
~HFP
.. VSH-"
P5
0
O-c
HBP
..
P6
0
0"
VFP
.-
P7
. .
LlF
..
P8
-+-VBP
.. L/F---..
MASTERISLA
VE
Selects master or slave
C
0
1
1
0
1
1
1
M
video synchronization
mode.
RESET
Resets the GOC to its
C
0
0
0
0
0
0
0
0
idle state and specifies
video-display format.
DISP START
Starts the display
C
0
1
1
0
1
0
1
1
scanning process.
DISP START
C
0
0
0
0
1
I
0
J
DISP STOP
Stops the display
C
0
0
0
0
1
1
0
0
scanning process.
ZOOMW
Specifies zoom coeffi-
C
0
1
0
0
0
1
I
0
cients for the display
P
-+-ZR
.. -+---ZW
..
and graphics-
character writing.
CSRW
Sets the position of
C
0
1
0
0
1
0
0
I
the cursor in display
PI
A7
A6
A5
A4
A3
A2
Al
AO
memory.
P2
AI5 A14 AI3 AI2 All AlO A9
A8
3-14
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