Gate Alley - Sharp PC-1350 Service Manual

Ce-516l; ce-202m; ce-201m
Table of Contents

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Vee
Input
buffer
- 11 -
.,_
R....:O....:M~
Not
used (F05
inverted
output)
To the
SIO
connector
Key strobe
(P-type open
drain
output)
RAM Card CE
RAM 1
CE
RAM2
CE
DI SP 1
CE
DISP
2
CE
DI SP 3
CE
DI SP 4
CE
DISP 5
CE
OUT4
IJJ
RR
OUTl
IJJ
SD
OUT2
1JJ
ER
OUT3
IJJ
RS
Unit cell
...
....
•.'\
...
A14
~
OPCE
...
. .
.....
. .
...
A13
,_
RAMl
_
...
A12
....
RAM2:
...
,_
: All
-
. .
Address
decoder~
DE
1
...
~ AlO
,,
-
DE
2
...
:- A9
"'
DE 3
...
-
...
....
,....
...
-
DE 4
...
-
....
-
DE
5
-
...
...
...
R/W
I
,,
A
...
D6
K07
...
....
D5
...
...
K06
-
,,
....
....
D4
KO 5
...
,,
·~
-
D3
K04
....
....
D2
Data
latch
....
...
K03
...
....
Dl
...
...
K02
...
....
DO
....
...
KO 1
...
....
....
CPU
From
signals.
SC60220 Gate Alley
This LSI chip is used to decode various LSI (RAM, DISP) chip select signals, to generate key
strobe,
and to buffer SIO output
BOS
-
PC-1350

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