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SILICON GATE MOS
8255
MODE 2
AND
MODE 0
(INPUT)
MODE
2
AND
MODE
0 (OUTPUT)
PC
3
INTRA
PC
3
INTRA
PA
7
-PA
O
PA
7
-PAo
~
OBF
A
P~
OBF
A
CONTROL
WORD
PC
6
.
ACK
A
CONTROL
WORD
PC
6
.
ACK
A
0
7
0
6
05 04
03
O
2
0,
DO
0
7
0
6
0
5
0
4
0
3
O
2
0,
DO
PC
4
STB
A
PC
4
.
STB
A
PC
2
.()
PC
5
IBF
A
PC
2
.()
PC
5
IBF
A
1 = INPUT
1= INPUT
O=OUTPUT
0=
OUTPUT
3
3
PC
2
.()
I/O
PC
2
.()
.
I
I
"
I/O
AD
RO
P~-PBO
PB
7
-PB
O
8
WR
WR
MODE 2
AND
MODE 1 (OUTPUT)
MODE
2
AND
MODE 1 (INPUT)
PC
3
A
-".
PA
7
-PAo
~
8
'f
y
PC
7
°
PC
6
2
0,
DO
1
PC
4
PC
s
A
PB
7
-PB
O
K
8
I
.....,
PC
2
.
.-
PC,
.
PC
O
WR
RO
CONTROLWOR
ACK
B
PC
3
A.
~
PA
77
PAo
( 8
~
PC
7
°
PC
6
2
0,
DO
0
PC
4
PC
s
t-...
PB
7
-PB
O
8
)
PC
2
PC,
PC
O
RO
WR
CONTROLWOR
Mode 2 Combinations
5-125