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5 ADDRESSING
The MPA-200 occupies a continuous 8 byte block of I/O addresses. For example,
if the base address is set to 300H, then the MPA-200 will occupy address
locations 300H-307H. The base address of the MPA-200 may be set to any of the
first 64 Kbytes (0 - FFFFH) of available I/O address space through the settings of
dip switches SW1 and SW2. SW1 allows the user to select the higher address
signals A15 - A8. SW2 allows the user to select the lower address signals A7 -
A3. The sixth position of SW2 is not used and can be ignored. Figure 2 shows
some examples of different base addresses.
Figure 1 Address switch selection examples.
ON
ON
ON
ON
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
1
1
2
2
3
3
4
4
5
5
6
6
Base Address = 300H
Base Address = 3F8H
SW1
SW2
SW1
SW2
A15
A13
A12
A11
A10
A9
A8
A7
A6
A5
A4
A3
NOT USED
A15
A14
A13
A12
A11
A10
A9
A8
A7
A6
A5
A4
A3
NOT USED
A14
15 Quatech Inc., MPA-200/300 Manual