PMAC2-Lite Hardware Reference Manual
DIP Switch Block S1: ISA-BUS Address Select
S1B
S1A
4 3 2 1 8 7 6 5 4 3 2 1
OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF
⇑
⇑
⇑
⇑
⇑
⇑
⇑
⇑
⇑
⇑
⇑
⇑
⇓
⇓
⇓
⇓
⇓
⇓
⇓
⇓
⇓
⇓
⇓
⇓
ON ON ON ON ON ON ON ON ON ON ON ON
The 12 DIP switches on block S1 set the base address of the PMAC2 on the PC bus. Together they form
a binary number. Each switch, if in the ON (closed) position, sets its bit to 0; if in the OFF (open)
position, sets its bit to 1. The possible base addresses are all multiples of 16, so switch 1 sets a bit value
of 16, switch 2 sets a bit value of 32, and so on.
Switch #
Bit Value
Default
Default
Value
Your Value
1 (S1A-1)
16 (10h)
ON (x1)
16 (10h)
2 (S1A-2)
32 (20h)
OFF (x0)
0
3 (S1A-3)
64 (40h)
OFF (x0)
0
4 (S1A-4)
128 (80h)
OFF (x0)
0
5 (S1A-5)
256 (100h)
OFF (x0)
0
6 (S1A-6)
512 (200h)
ON (x1)
512 (200h)
7 (S1A-7)
1024 (400h)
OFF (x0)
0
8 (S1A-8)
2048 (800h)
OFF (x0)
0
9 (S1B-1)
4096 (1000h)
OFF (x0)
0
10 (S1B-2)
8192 (2000h)
OFF (x0)
0
11 (S1B-3)
16384 (4000h)
OFF (x0)
0
12 (S1B-4)
32768 (8000h)
OFF (x0)
0
Total --
--
528
(210h)
To set the board to a different bus address, specify that address in hexadecimal form, because each hex
digit corresponds to four switches. The last hex digit of the base address is always zero.
For example, to set the base address on the PC bus to 992 decimal, or 03E0 hex. The first '0' corresponds
to switches 9 through 12. All of these should be ON to set their bits to zero. The '3' corresponds to
switches 5 through 8. Switches 8 and 7 should be ON, and switches 6 and 5 should be OFF to define the
'3'. The 'E' corresponds to switches 1 through 4. Switches 4, 3, and 2 should be OFF, and switch 1 should
be ON to define the 'E'.
Switch #
12
11
10 9 8 7 6 5 4 3 2 1 - - - -
Hex
0
3
E
0
Binary
0 0 0 0 0 0 1 1 1 1 1 0 0 0 0 0
Setting
on on on on on on off off off off off on - - - -
10
PMAC2-Lite E-Point Descriptions
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