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SYSTEM
OPERATION
l!
rr
r j r j
j j
l!
<t
0
o ...
o 0
l<t
CC
III
III
III
""
0
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CIl CIl
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~
~
Ili
to
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-'
0
CIl CIl
~ ~
~
~
~
cc
J:
J:
~
GND
--
cc
cc
cc
8085A
~
:::l
-
I"-
0
0
0
>
~
~
W
I:!:
W
~
0
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cc
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cc
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VCC
/).
on
w,
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o·
z:
W : VCC
~(
(81
\31
K
'I
Vcc Vcc
~
SEE
NOTE 4
..A
(
7
NOTE
1-
_
TRAP,INTR,
AND
HOLD
MUST
BE
GROUNDED IF THEY
AREN'T
USED_
I T E
NOTE 2: N THIS CONFIGURA
ION,
TH
1/0
CAN T
BE
MEMORY MAPPED (WITHOUT
EXTRA
LOGICI BECAUSE
ALL
OF
THE ADDRESS LINES ARE IN
USE_
NOTE 3: CONNECTION
IS
NECESSARY
ONLY
IF ONE TWAIT STATE
IS
DESIRED_
NOTE
4: PULL-UP RESISTORS RECOMMENDED
TO
AVOID
SPURIOUS SELECTION
WHEN
iffi
AND
WR
ARE 3-STATED_
FIGURE 3·8 EXPANDED SYSTEM
VCC
~~
MANUAL
RESET
-1...
RESET
iN
~
1
I
X1~
c::J
III
X2
-----=r
::(
;
PROG/CE
8355/8755A
ICE
;
PROG/CE
8355/8755A
ICE
PROG/CE
VCC-
CE
READY
ClK
VCC
lOR
AS-A
10
y
8355/8755A
V
'I
RESET
101M
.A
WR
"-
~
AD
A
ALE
PAO-PA7
r-...
~
AI:b-AD7
PBO-PB7
'I
JD
I
VCC
..A
ICE
8156
"-
I
'"
..A
CE
...
.A
('
S156
'I
RESET
101M
PA
O
-PA
7
WR
AD
A.
PSo-
PB
7
ALE
'I
A
PCO-PC5
~
I-
ADO-AD7
TIMER
IN
I"
TIMER
OUT
I
I
GND
VCC
3·10
10..
PORT
A
(81
~
I'
A
10..
PORT
B (SI
'I
y
...
PORT
A (SI
..
PORT
B (SI
I'
PORT
A (SI
y
PORT
B (SI
Y
PORT
C
(81
y
...
PORT
C (SI
I'
..
PORT
C
(61
Y
"-
PORT
A (SI
y
.Jo..
PORT
B (SI
Y
10..
PORT
C
(61