Tandy 1400LT Service Manual page 186

RAM
ADL-100SP4
+5v
74HC 157
1 Y
2Y
3 Y
4Y
74HC 157
16 1y
26
48
~ 2 A
l4
I
4A
(1, 3, 4, 5 . 14. 17)
(1. 3, 4. 5, 14. 17)
(1, 3, 4, 5. 14, 17)
( I , 3, 4. 5. 14, 17) 1 A 3Y
(1, 3, 4. 5. 17)
(1, 3, 4, 5 . 17) 1 1 ~ 3 A 4Y
(1, 3, 4.
5 .
17)
3
(1, 3,
4. 5. 14. 17) 10 38 2Y
l3
SEL
..
(15)
I C 4 1
15,G
IC45
8 1
p 3 -
EDL-60
1 M (256
x
4 B i t ) DRAM
vcc
GND
8 1 1 6 5 4
C70
0.01u
(14)
FTAEtr
A
A0
A I
A2
A3
A 14
A15
A16
A17
A4
A5
A6
A7
A10
A l l
A12
A13
7
A0
'
8
A I
9 A2
11 . A 3
12 A4
13
14 A6
' 7
ti
IC43
' I
-
I
T
+5v
t
RAS CAS
C72 q
0 . l u
4
4
R58 22HM
7
4
...
t b
" *
. .
(14)
R59 22HM
9
12
+5v
FIR
FIR
E M A O
E M A 1
EMA2
EMA3
EMA4
EMA5
EMA6
EMA7
4
1
(15, 17, 18) DRAMPI5
1
1
+5v
(14) ADL-100SP10
74HC245
(1, 4. 5. 14. 15, 16, 17)
A2 82
(1. 4.
5, 14, 15. 16, 17) A3 83
71.
4. 5, 14, 15. 16, 17) ~ A 4 84
(1, 4. 5, 14, 15, 16, 17)
A5 85
(1. 4,
5.
14, 15, 16, 17) A6 B6
(1, 4, 5, 14, 16, 17) - A 7 B7
9 - A 8 88
(1, 4, 5, 14, 15, 16. 17)
(1. 4 s 5, 14. 15, 16, 17) 2
A I 6 1
DO
D 1
D2
03
D4
05
D6
D7
m
D-275-G
IC40
I
45
C69
...
73
R58
, .
59
R A l l
12
1 -
11
4
D I R
d G
IC42
+5v
(14)
C7 1
0.01u
*
1 M (256 x 4 B i t ) DRAM (17. 18) E M D O
(17, 18) EMDI
(17, 18) EMD2
(17, 18) EM03
(17, 18) EMD4
(17, 18) EMD5
1
(17,
l e )
EMD6
(17. 18) EM07
NO. 11
7-1 1