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Input
Output
A
B
y
L
L
H
H
L
H
L
H
H
H
H
L
Truth table
Y=~
Vss
2Y
2B
lY
2A
lB
lA
7
3A
3Y
3B
4A
4Y
VDD
4B
14
Pin configuration
F04
Al3
Output
0
0
RAMI
0
1
RAM2
-
PC-1260
PC-1261
7-2. PC-1260 decoder (TC40HOOOP)
-6-
Don't care
INPUTS
OUTPUTS
ENABLE
SELECT
GI
G2A
G2B
A
B
c
YO
YI
Y2
Y3
Y4
Y5
Y6
Y7
L
* * *
*
*
H
H
H
H
H
H
H
H
*
H
* * * *
H
H
H
H
H
H
H
H
* *
H
* *
*
H
H
H
H
H
H
H
H
H
L
L
L
L
L
L
H
H
H
H
H
H
H
H
L
L
H
L
L
H
L
H
H
H
H
H
H
H
L
L
L
H
L
H
H
L
H
H
H
H
H
H
L
L
H
H
L
H
H
H
L
H
H
H
H
H
L
L
L
L
H
H
H
H
H
L
H
H
H
H
L
L
H
L
H
H
H
H
H
H
L
H
H
H
L
L
L
H
H
H
H
H
H
H
H
L
H
H
L
L
H
H
H
H
H
H
H
H
H
H
L
Truth table
SELECT
ENABLE
Y7
Vss
DATA
OUTPUT
A
B
c )
,GM
G2B
Gl
I
•
VDD
Y6
\
DATA OUTPUTS
.
Pin configuration
F04
Al3
Al2 All
Output
0
0
0
0
RAMl
0
0
0
1
II
2
0
0
1
0
II
3
0
0
1
1
II
4
0
1
0
0
II
5
7-1. PC-1261 decoder (TC40H 138P)
7. RAM SELECT CE-PLA
-OGIC
2000H
DISPI
20BFH
28001-1
DISP2
28BFH
3000H
30BFH
38001-1
38BFH
4000H
4800H
5000H
5800H
6000H
6800H
'N ON
ON ON OFF
ll
H2
H3 H4
HS
tput wave-
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