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Y1
R8
15MHz
R?
Vee
OL
1.
510Q
1 1
510Q
1.
ClK
-
D3
R1
y914
PORT
A
/
X1
X2
51
KQ
S1
"-
8284A
...L
-r--
CE1
~
ClK
E?
RES
fr:F'
0:J
/'
PORT
B
CE2
"-
RESET
READY
A10
A9
8?55A
E2
A8
ALE
ADO·
/
,----
RD
AD?
"-
-
lOW
ClK
RESET
READY
I--
A
11
A8·
A8·A19
8088
A 19
A13
v
CPU
A12
A10
L
E4
/
A8 A9
MN/MX
ADO·
ADO·AD?
AD?
~
ALE
RD
WR
101M
'--
101M
/-
'---
WR
'--
WR
RD
ADO·AD?
l
RD
"y-
I
ALE
ALE
8185
RESET
CE
E5
/
8155
ADO·AD?
E1
...
"'-
PORT
PORT
C
A
Vee
~
L
PORT
"-
CE2
CE1
TIMER
OUT
B
"
TIMER
ClK
CS
Figure 4·0. iAPX 88 Multiplexed System
4-2