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JUMPER LOCATIONS
Determining I/O Addresses
The PC turbo
286e
uses eight consecutive I/O
addresses. The addresses used by the
PCturbo
286e
can not be used by other
peripherals.
o
The
i/o
addresses can start at any
multiple of eight.
In hexadecimal, the starting address are:
100, 108, 110, 118, 120, 128 ... up
through 3EO, 3E8, 3FO, 3F8.
Notice that the starting address must end
in
0
or 8 in hexadecimal.
The I/O address is set by the row of seven
jumpers labeled SWI at the lower edge of the
PCturbo board. The jumpers in the row
are labeled
1
through
7.
Each jumper corresponds to one bit of the
address in binary. The address has 10 bits,
but only the
7
most significant bits are
jumpered. The 3 least significant bits are
set to
0
so that the address will always end
in a multiple of 8.
o
Jumper
1
corresponds to the highest bit
of the address in binary, the 5l2's
place.
0
0
Jumper 7 corresponds to the fourth bit
from the lowest, the 8's place.
Installing a jumper sets the bit to O.
Removing a jumpet sets the bit to
1.
A-3
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