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SCHOTTKY BIPOLAR 8228
ADDRESS
BUS
DB
O
DB
1
DB
2
DB
3
DATA
BUS
DB
4
DBs
DB
6
D~
INTA
MEM R
MEMW
CONTROL BUS
I/O R
I/OW
2
25
-
GND.
·
Ao
Ao
20
26
A
1
+5V
A
1
11
27
A
2
-5V
A
2
28
29
--
A
3
+12V
·
A
3
30
A
4
A
4
31
As
AS
32
A
6
A
6
8080A
33
A
7
CPU
A
7
I-
34
AS
AS
13
35
A
g
SYSTEM
DMA
REO.
·
HOLD
A
g
1
A
10
A
10
40
A
11
A
11
37
A
12
14
A
12
SYSTEM INT. REO.
•
INT
38
A
13
A
13
16 39
A
14
INT. ENABLE
......-
INTE A
14
36
A
1S
A
1S
18
WR
P
-
17
DBIN
413(')
r,;
D
1
TAl
21
HDLA
21
14 15
22
13
11
10 15
13
----.
cP1
DO
DB
.
12
10
15
cfJ
2
9
17 16
~
0
1
,.
6
24 8
12
11
~
~
WAIT
O
2
8228
.
3
8224 4
23
7
10
BI-DIRECTIONAL
9
REArJY
0
3
,.
~
CLOCK
3
6
BUS
DRIVER
5
GENERATOR
0
4
.
2
DRIVER
1
12
19 18
-..0
RESET
4
.
Os
9
5
21
20
----.
0
6
.
16
5
19
6
8 7
----.
SYNC 0
7
,.
8
--
28
-------
23
---.
n
--
+5V~
~4
r
14
.....
GND---'"
....,
STATUS STROBE
1
SYSTEM
26
.n
h
"""
CONTROL
~5
22
~7
BUSEN
·-c
!"oF
RESIN
+12V
+5V
GND
TANK
OSC
cfJ2
(TTL)
RDYIN
8080A
CPU
Standard Interface
5-12