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PROGRAMMING INFORMATION
The as-shipped configuration of the iSBC 86/14 board includes dual port
RAM at local CPU addresses x07FFFH through xOOOOOH.
Of the 32k bytes of
RAM,
you can selectively assign the memory space to be dual port
RAM.
As
Table 3-1A shows, the Multibus address of the dual port
RAM
may be
selected as required for the application.
The default configuration of
Multibus address for the dual port
RAM
places the 32k bytes of memory at
Multibus addresses x9FFFFH through x98000H.
User configuration of
jumpers as described in paragraph 2-13 allows moving of the dual port RAM
to another Multibus addTess.
3-4.
iSBC 86/30 BOARD MEMORY ADDRESSING
As shipped, the iSBC 86/30 board accommodates up to 128k bytes of
RAM
and
up to 64k bytes of EPROM.
By installing an iSBC 304
RAM
Expansion
Multimodule Board, the on-board
RAM
capacity can be doubled.
Table 3-1B
provides the memory address ranges for various EPROM and
RAM
configurations of the iSBC 86/30 board, including a configuration with
the iSBC 304 RAM Expansion Multimodule Board.
Table 3-1B shows that the Multibus address range for accessing EPROM is
from xFOOOOH to xFFFFFH and the local address always ends with the
highest possible address (xFFFFFH) regardless of the size of the memory.
The factory default condition is for installation of four 2716 devices
providing memory from OFEOOOH through xFFFFFH.
The as-shipped configuration of the iSBC 86/30 board includes dual port
RAM
at local CPU addresses x1FFFFH through xOOOOOH.
Of the 128k bytes of
RAM,
you can selectively assign the memory space to be dual port
RAM.
As
Table 3-1B shows, the Multibus address of the dual port
RAM
may be
selected as required for the application.
The default configuration of
Mu1tibus address for the dual port
RAM
places the 128k bytes of memory at
Multibus addresses xBFFFFH through xAOOOOH.
User configuration of
jumpers as described in paragraph 2-14 allows moving of the dual port
RAM
to another Multibus address.
3-3
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