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75
Ihterface
expansion
i
i
direction
_
Signal
(CPU
-out)
t
+5v
-4-_~
i
D..
-~-»
D,
--
D.
---»
D1
--»
A,,
--~
1
{
A,
A
---A
A.
---»
A.,
---
A.
4--»
----
A.,
---
A,.
--»
BA
-_-
'
E555
---
11/w
---
R/w
---»
1-:
--»
'1§'§
---
1
T55
---
EXE
EXE4142WTTEE.---
ETA'
--
HALT
--»
'
ISMCK
---»
2Mc1<
---
-5V
--~
-12v
-1-
GND
----
(I/F-I
I/F-6)
ipinppin
,
Signal
No.
1
1
2
GND
3
4
D,
i
5
5
D,
1
s
D5
1
'
9
10
D,
'
11
12
A,
Q
Q
13
14
A,
15
16
A.
17
18
A,
19
20
A.
A
A .
21
22
A,,
23
24
A,,
25
26
A,,
'
27
28
BS
'
"
29
so
EXROM-KIL
'
E356
IN
31
32
OUT
33
34
VMA
our
A
as
as
Q
FH
37
38
as
mi
40
WTTEE.
41
42
§XN'1FSW
43
44
ACK
45
46
SOUND
47
48
GND
49
so
GND
'}§;'§'{ffR)"§"
51-
52
53
54
+12V
55
56
+5v
5
direction
(cPU-
out)
---
---»
--»
---
»--»
----
{
|
---
~
--»
--»
---
---
--»
--»
-~
--~
--~
--»
---»
----
---
---
---
IN
---
f--»
1--»
--->
---»
--
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