Chapte; Ope Ating Featu Es; Dynamic R M Capacity - Intel SYSTEM 310 Configuration Manual

CHAPTE 2
OPE ATING FEATU ES
This chapter briefly discusses the operating features of each of three
System 310-compatible memory boards: the iSBC 012B memory
board, the iSBC 056 memory board, and the iSBC 304
MULTIMODULE board.
Since the System 310 does not use every feature these boards can
provide, this chapter compares the available features with the
features actually used by the System 310. It further notes which
features are controlled by jumpers in case you want to add a feature
not currently implemented in the preconfigured systems. See
Chapter 3 for specific jumper changes.
DYNAMIC RAM CAPACI Y
The three memory boards recommended for the System 310 provide a
range of memory from small to large. The smallest increment you
can buy is the 304 MULTIMODULE board which supplies 128K bytes
Oof R M and fastens directly onto the processor board. In the
middle-sized range, the 056 board supplies 256K bytes of R M, and
at the high end, the 012B board supplies 512K bytes of R M. Both
the 012B and the 056 boards are addressable on 4K boundaries.
ll R M must be addressed as a contiguous block and jumpers select
the starting and ending addresses of the block. These address select
jumpers are found on the 012B board and the 056 board. The
address range for the 304 board is controlled with jumpers on the
86/30 processor board.
o
AU OMA IC ON-BOARD REFRESH
The 012B and the 056 boards automatically refresh their R M with
an on-board pulse generator so that you do not have to provide these
signals. The processor board provides the refresh signals for its R M
and the 304 MULTIMODULE board (when installed).
If you want to provide off-board refresh signals, however, you can
change the memory refresh jumper settings on the memory boards.
You cannot supply off-board refresh to the processor board, In
addition, you will have to supply a dual auxiliary bus connector (also
known as a P2 connector) to connect your refresh logic circuit to the
bus.
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