Sharp CE-150 - Page 405

All and more about Sharp PC-1500 at http://www.PC-1500.info
4-2-3. Chip select circuit for the PC-1500A
CP U
BfO 1--t+ J-":~
AOl i i- ..J,- l.j.:.::.: .:.,j
·~ l
I
AOI S
11 0 PC
SI To U se 1 RA M
52
S3
S~ l l<> Ml>:lule U1l 1l
S5
$6
M£ 0
M EO 1-" =-H, ,--- - - - - t t--r'
w
111
'---- ----- ·~ To Sy st en'l ilAM
L- ---- - - ------ --,-- - To 1/0 l'OR i ( Llt5811 )
~- .. To ROM { CS 613 \~f :
L-- - ----- -- ----- -- •T o M Ol.!11h: Un it
'--- -- ------- -- - - -- - · To M odu ~ e IJm t
'
c - !» ·-{»
TC4 0t1139 (lt(U•1
; (!1(\1 1
~-t»
VO
INPUT
I
OUTPUT
(N.\StE Sf,LECT
G
A
a
I
y~
YI Y2
YI
H
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1;.
H
"'
II
L L l
l
l
II H
Y3
H
H
,
"
L
H
l
1
II
l
~ P=l
II II II
L I H
L l
G
v;
L
II II
"
H H
I
I.
.
'
·!: • Irrelevant
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