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C1
XTAl
G,gO
+5V
3-10 pF 12MHz
J~~DP
X2
GND
DY
REA
IN
PUT
N
US
OT
ED
+S
V
R2
17
Xl
7.SK
GND~
CYSYNC
RD1
GND-2,
AEN1
NC-4
RD2
AEN2
APPLICATION
EXAMPLES
+'~8
GND~20
+I~o
V"
GND GND
V"
~
RESET
INTA
ClK
8
19
ClK
HI5A
RESET
f!-Q-
SSO
READY
5
22
READY
A19
A18
PCLK
.!.....-
A17
A16
OSC
~NC
A15
R1
CR1
8284A
EFI
~NC
A14
7.SK
F-GND
R
SW
+SV
ESET
ITCH
I
SW1
'~~'
11
RES
I
....
R3
7.SK
U1
FIC
A13
I-
A12
A11
AlO
BOBB
A9
U2
A8
OT/R
WR
~}
30
~
NC
~
?-}
~
NC
~
~
~
t+-
~
S
r,;-
r,-
~
29
Ne
-fa
C2
AD
32
I1j.1fd
DEN
r
lalM
-
ALE
33
MN/MX
AD7
AD6
ADS
AD'
"~
TEST AD3
17
HOLD
AD2
NMI AD1
18
INTR
ADO
GND
8
A8-A1S
GI~
+1~6
A11
1
AD
GND
Vee
1K
BYTES
RAM
256
BYTES
RAM
2K
BYTES
ROM
00000-003FF2114's
RAM
(MAPPED Q·07FF)
03000·030FF8155
RAM/IO
(MAPPED
3000-37fF)
FF80,O-FFFFF8655A
MONITOR
(MAPPED
80000-FFFFF)
110
USART
COM/STATUS
DATA
8155
COM/STATUS
PORT A
PORT B
PORT C
TIMER
lOW
TIMER
HIGH/MODE
8655 PORT A
PORT B
PORT
A DDR
PORT
BOOR
gg~gJ}
1~~~~E~E3~gO~3YFFF)
3000}
3001
3002
I/O
3003 - (MAPPED 3000-37FF)
3004
3005
2800
}
2801
I/O
2802 (MAPPED 2800-2FFF)
2803
A12
A13
A14
A15
NOTE:
I/O
ADDRESSES
0-3FF
WilL
TALK TO RAM &
THEREFORE
SHOULD
NOT
BE
USED
2
A1
3
A2
00
Of
1)2
8205
03
U7
04
Os
8
Eo
06
5
E2
07
4
Ei
28
25
ti'o
r,;-
~
~
~
t-;s
~
U10
,-
13
~
NC
~"
10
9
7
Figure 4-4. iAPX 88 Demultiplexed
Bus
System
4-8
2MHz
G12~
+i~o
V"
......!
V"
~}
RESET
PAO
+5v--i
PA1
~
Voo
PA2
~
PA3
27
~
NC
PA'
-;;-
PAS
~
PA6
~
PA7
r'-
PBO
~}
rl
22
AlO
PB1
?
A9
PB2
~
L2!
A8
35
PB3
~
NC
B655A
PB'
U3
PBS
~
8 IDA
PB'
~
10
lOW
PB7
tE-
9
RD
7
101M
READY
t=}NC
11
ALE
ClK
~
AD7
~
AD6
r--+!
ADS
r----!-!
AD'
~
AD3
~
AD2
13
AD1
~
ADO
CE2
CE1
2
1-'
ir--
,
55"-
A~
,
>.
~1DO
+l~o
3
~
GND
Vee
007
~
017
~
016
006
~
AS
6
015
DOS
~
~
F---'i
D14
DO'
12..-
013
003
,!L-
~
~
012
8282
002
~
~
011
U8
001
~
010
000
r!L-
r=--'"
11
STB
DEr}
~3
2