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PREPARATION FOR USE
2-11.
JUMPER/SWITCH CONFIGURATION
The iSBC 86/14 and iSBC 86/30 boards provide a variety of jumper-
selectable options to allow the user-configuration of the board for a
particular application.
Table 2-4 lists the jumper options according to
the function performed on the iSBC 86/14/30 board.
The jumper
configurations for the two versions of the board are identical except for
the configuration of th,e memory capacity jumpers.
Table 2-5 lists all
jumpers in numerical order and provides a functional description of
each.
Appendix D lists all configuration differences between the
iSBC 86/14 board, the iSBC 86/30 board, and the iSBC 86/12A board.
Table 2-4.
User-Configurable Jumper Functions
Jumper
Function
No Dual Port
Memory
Op
tion
Dual Port
Size Select
Bank
Select
Multibus
Address
Select
Jumper
Pair
E199-E200
E234 through E237
E220,E221,E222,E224
E218-E223
2-11
Description and Connection
Selects operation with no dual
port RAM resources; all RAM is
reserved strictly for on-board use
only.
Allows selection of either 0, 32k,
64k, 96k, or 128k bytes of dual
port
RAM
on the iSBC 86/30 board
or 0, 8k, 16k, 24k, or 32k bytes
of dual port
RAM
on the iSBC 86/14
board.
Refer to paragraph 2-15
for more details on jumper
configurations.
Allows user select in of one of 16
possible megabytes of memory space
by configuring the state of the
upper 4 memory address bits
(ADR14/ through ARD17/).
Configured for megabyte page 0
when shipped.
Selects the megabyte address on
the Multibus interface to which
the board will respond; for
off-board access to local memory.
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