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Vector 4 - Page 67

Vector 4
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CPU,
RAM/PROM
and
Yideo
portions
of
SBC
Schematic
(Exhibit
VI-2
(B))
Schematic
Schematic
Schematic
Block
Notation
Subsystem
Page
Diagram
Title
Number
Number(s)
Ab
Microprocessor
)
CPU
System
MUX
.
Page
1
26
®
A7
Data
Bus
Transcelver
Page
1
20
Bl
Address
Mapping
RAM
Page
1
21
B2
CPU/Video
MUX
RAM/PROM
System
Control
Page
1
29
B3
CPU/Video
Address
MUX
Page
1
29
.
C1
Video
Controller
Page
1
27
Video
System
C2
Video
MUX
Page
1
30
oBg
-087
(2)
(2)
o
ZAN1=-24A15
;
ZA7
(2,3}
(2)
v
u22
745189
7415245
>
us
74LS04
u4
(1)
IOWR
IoRG
—D—-
P167
74L
SO0
(3)
741502
(2)
7415367
MEMWR
(2)
+5v
IORD
(3}
10
CCa/Mag
IOWR()
A17
88ENBL
()
AQ
B8O
ENBL
1)
74L
51367
(3}
74LSC4
PAATT
(2)
{1}
Cru/
{2)
(1)
IORQ
+5
L3
D
A8
OISEN
{2}
A10
VSYNC
12)
HSYNC
(2!
88
ENBL
(1)
]
.
||L-1>
<
aLPw/
.
GRADW
RAP
W
,i)
Jb4
74504
ueH
741574
II
3-4