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Each
section of the address space. The last 8K section is
further divided into 1K sections by the switches in
S2.
For addresses OOOOH through DFFFH, each 8K section is
controlled
switching scheme described in Section 3.2. In order
for
corresponding S1 switch must
corresponding section of the address space must be
turned on by the bank switching logic.
The last 8K section, E000H through FFFFH, can either
be
controlled
sections, or it can be controlled by S2. If it is
controlled by S1, then all of the S2 switches must be
turned off. If it is controlled by S2, switch E of S1
must be turned off.
If the last 8K section is controlled by S2, individual
1K sections of the address space can be selected, and
the selection is independent of bank switching. Any 1K
section is selected if the corresponding S2 switch is
on, and is not selected if the switch is off. This
arrangement
EBFFH and EC00H through EFFFH to be disabled to allow
space for the Disk Controller and Floating Point Board
in the Horizon System.
Since the memory selected by S2 is not bank switched,
no two banks in the same system may have the same
switch in S2 set on. For example, if two banks have
switch EO of S2 turned on, both banks will respond to
memory addresses EOOOH through E3FFH.
3.3.2
Revision E Board
The Memory Address switches allow the HRAM board to
respond to some sections of the memory address space
and
Memory Address switches S1 and S2 on the Revision E
board and the address space is shown in Figure 3-11.
HRAM
of
the
switches
by
the
any
of
these
as
allows
not
to
others.
in
S1
corresponds
switches
in
8K
sections
to
be
described
for
memory
sections
The
correspondence
USER/TECHNICAL MANUAL
to
one
S1
and
the
bank
be
active,
on (up), and
the
other
seven
E8000H
through
between
8K
the
the
the
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