PMAC-Lite Hardware Reference
30
Bus Address Jumper Setup
3. Take the second hex digit and convert it to binary. The binary digits represent bits 7 through 4 of the
base address. Assign each binary digit to jumpers as follows:
Bit #
7(MSB)
6 5 4(LSB)
Jumper
E68 E69 E70 E71
Digit Value
8 4 2 1
Setting for 1
OFF OFF OFF OFF
Setting for 0
ON ON ON ON
Example 1:
You wish to set up the card to be at base address 992 decimal on the PC expansion bus.
1. 992 decimal is equal to 3E0 hexadecimal.
2. The first digit of 3 is binary 0011. This sets E91 ON, E92 ON, E66 OFF, E67 OFF.
3. The second digit of E is binary 1110. This sets E68 OFF, E69 OFF, E70 OFF, E71 ON.
Example 2:
You wish to set up the card to be at base address 528 decimal on the PC expansion bus.
1. 528 decimal is equal to 210 hexadecimal.
2. The first digit of 2 is binary 0010. This sets E91 ON, E92 ON, E66 OFF, E67 ON.
3. The second digit of E is binary 0001. This sets E68 ON, E69 ON, E70 ON, E71 OFF.
Example 3:
You wish to set up the card to be at base address 544 decimal on the PC expansion bus.
1. 544 decimal is equal to 220 hexadecimal.
2. The first digit of 2 is binary 0010. This sets E91 ON, E92 ON, E66 OFF, E67 ON.
3. The second digit of E is binary 0010. This sets E68 ON, E69 ON, E70 OFF, E71 ON.
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