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3.2.1 Base Address Selection
The PCL-722 requires 32 consecutive address locations
within the I/O space. Some I/O address locations will be
occupied by internal I/O and your peripherals. In order to
avoid conflict with these devices, the PCL-722 address can
be set by a 6 position DIP switch and placed anywhere in the
IBM PC decoded external UO space.
The 200-3FF hex (512-1023 decimal) address range provides
extensive unused areas of I/O space, though you should
check with the IBM Standard Technical Reference Manual
for possible conflicts with commonly installed peripherals.
Table 3.1: Switch Position Summary
I/O Address Range (Hex)
------------------------------------(Fixed)-------------------------------------------------
200-20F
210-21F
220-22F
......
2C0-2CF*
......
300-30F
......
3F0-3FF
Note:
Switch Position
A9
1
1
1
1
1
1
- ON=0, OFF=1
- A4...A9 corresponds to PC bus address lines
- * means factory setting
- Switch position 6 is not used
1
2
A8
A7
0
0
0
0
0
0
0
1
1
0
1
1
15
3
4
A6
A5
0
0
0
0
0
0
1
0
0
0
1
1
Chapter 3
5
A4
0
1
0
0
0
1
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