Manual 104-QUAD-8
12
The board’s base address is set up by JUMPERS. Those jumpers control address bits A5 through A9.
(Lines A4, A3, A2, A1 and A0 are used on the board to control individual registers. How these four lines
are used is described in the Programming section of this manual.)
To determine how to set these JUMPERS for a desired hex-code address, refer to the SETUP program
provided with the board. If you prefer to determine proper jumper settings yourself, first convert the hex-
code address to binary form. Then, for each "0", install corresponding jumpers and for each "1", remove
the corresponding jumper.
The following example illustrates jumper selection corresponding to hex 300 (or binary 11
000x xxxx). The "x xxxx" represents address lines A4, A3, A2, A1, and A0 used on the board
to select individual registers as described in the Programming section of this manual.
Base Address in Hex Code
3
0
Conversion Factors
2
1
8
4
2
Binary Representation
1
1
0
0
0
Jumper Legend
A9
A8
A7
A6
A5
Addr. Line Controlled
A9
A8
A7
A6
A5
Jumper Selection
OFF
OFF
ON
ON
ON
Table 4-2:
Hex Conversion Table
Carefully review the address selection reference table on the preceding page before selecting the board
address. If the addresses of two installed functions overlap, you will experience unpredictable computer
behavior.
