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Board Addressing
An example jumper for the Address Block beginning
with the:. Address-C hex:
The board address select jumper location is C2.
permits any one of the 16 possible 4K blocks of memory
space to be jumpered to form the board enable.
The jumper location accepts a standard 16 pin IC socket
— -and■the jumpers can be soldered on to a header which can
be plugged into the socket and changed easily without
any resoldering from the board.
After selecting a board address, the user must properly
jumper the socket.
address inputs to the NAND gate must be high.
any address bit not a
inverted before connection to the NAND input.
Address bits 12, 13, 14 and 15 are available on pins 1,
3, 5 and 7 and their respective complements on pins 2, 4,
and
.
These signals should be jumpered to the input
6
8
of the board select circuitry which appears on pins 9
through 16.
Very simply, to enable the board, all
at the selected address should be
1
An
position DIP switch similar to that
8
It
Therefore,
*7
13
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