VL-1225/6 Analog Input/Output Board
2-7
8-Bit I/O Addressing
To configure the board for an 8-bit I/O address refer to the figure below. Use the table to select the
jumpering for the appropriate upper and lower halves of the desired starting address (i.e., “3” and “0” =
hex address 30).
This jumper configuration ignores the state of the IOEXP signal in addressing the board. To use the
IOEXP signal refer to page 2-10.
Upper
Lower
V12
1-2
V12
3-4
V12
5-6
V12
7-8
Digit
V12
9-10
Digit
X
X
X
X
0
X
0
X
X
X
–
1
–
8
X
X
–
X
2
X
X
–
–
3
X
–
X
X
4
X
–
X
–
5
X
–
–
X
6
X
–
–
–
7
–
X
X
X
8
–
X
X
–
9
–
X
–
X
A
–
X
–
–
B
–
–
X
X
C
–
–
X
–
D
–
–
–
X
E
–
–
–
–
F
X = Jumper installed
– = Jumper removed
Jumper
Jumper
Jumper
Jumper
Jumper
As
As
As
As
As
Block
Block
Block
Block
Block
Description
Description
Description
Description
Description
Shipped
Shipped
Shipped
Shipped
Shipped
V8
MEMEX Select . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ignore
V9
Board Address (A10 – A15) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FF08H
V10
IOEXP Select . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ignore
V11
Board Address (A8, A9) / 8-Bit Mode Selector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A8Hi, A9Hi
V12
Board Address (A3 – A7) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FF08H
V13
Address Type Select . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Memory
Figure 2-5. 8-Bit I/O Address Jumpers
Configuration – Board Addressing
