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S-100 Configuring and Programming
I/O DEVICE ADDRESS SELECTION (JE)
JE
A7 1
A6 2
A5 3
A4 4
A3 5
A2 6
12
11
10
9
8
7
SHUNT OFF = 1
SHUNT ON
= 0
E x a m p l e shown p l a c e s 740 b o a r d at I/O a d d r e s s 40H - 43H
8255A BASIC OPERATION
I/O
IN
IN
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
DEVICE ADDRESS
XO
X2
OPERATION
PORT A -> S-100 BUS
PORT C -> S-100 BUS
XO
X2
X3
X3
X3
X3
X3
X3
X3
X3
X3
X3
X3
X3
X3
X3
S-100
S-100
S-100
COH
OOH
01H
02H
03H
08H
09H
OAH
OBH
OCH
ODH
OEH
OFH
BUS ->
BUS ->
BUS ->
_>
0 ->
1 ->
0 ->
1 ->
0 ->
1 ->
0 ->
1 ->
0 ->
1 ->
0 ->
1 ->
P OR
1
POR'
CON
CON'
PCO
PCO
PCI
PCI
PC4
PC4
PCS
PCS
PC6
PC6
PC7
PC7
CONTROL(Mode 2 )
Control/Data Flag
Res
INT
IBF
Reset Slave
INTE2 (INTE for IBF
INTE1 (INTE for OBF
OBF
IMS INTERNATIONAL
D00740 REV 1.0 October 20, 1981 Page 2
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