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Pin
1/0
SYMBOL
Description
19
0
CGAl
CGAX1:
CG address latch.
20
0
RSOL
RASELO:
Refresh address selection.
21
0
RA12
RA121 :
Refresh address bit 12.
22
0
RAll
RA 111:
Refresh address bit 11.
23
0
RA10
RA 101:
Refresh address bit 10.
24
0
RA09
RA091 :
Refresh address bit 09.
25
0
RA08
RA081 :
Refresh address bit 08.
26
0
RA07
RA071 :
Refresh address bit 07.
27
0
RA06
RA061 :
Refresh address bit 06.
28
I
VCC
+5V
29
0
RA05
RA05l:
Refresh address bit 05.
30
I
OC14
OSC141 :
Clock 14.31818 MHz for the video signal
DIOSLO:
31
I
ISLO
Display
1/0
selected.
Access signal to the
1/0
port of the GA.
32
I
MSLO
DMESLO:
V-RAM access signal for
cpu.
33
1/0
BD07
SYD71 :
Data bus bit 7.
34
1/0
BD06
SYD61 :
Data bus bit 6.
35
1/0
BOOS
SYD51 :
Data bus bit 5.
36
110
BD04
SYD41 :
Data bus bit 4.
D - 4
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