NorthStar HORIZON Random Access Memory User Manual page 48

0000H - 3FFFH
4000H - 7FFFH
8000H - BFFFH
C000H - FFFFH
On a 32K HRAM, the high order address bit (A15) is
not decoded. The result is that both rows of RAM
chips on the board and selected by two ranges of
addresses
configuration
prevents any one memory location from responding to
two different addresses. Section 3.3 describes the
use of these switches.
Address Range
0000H - 3FFFH
4000H - 7FFFH
8000H - BFFFH
C000H - FFFFH
HRAM
Table 5-2
Chip Selection-64K OR 48K, First Quadrant Option
active
Address Range
as indicated
of
Chip Selection HRAM-32
Row Address Strobe
Row
Address Strobe
RAS 1
RAS 2
RAS 4
RAS 3
in Table
the. Memory
Table 5-3
RAS 1
RAS 2
RAS 1
RAS 2
USER/TECHNICAL MANUAL
RAM
Chip Locations
64K
4A-4J ---
2A-2J 2A-2J
3A-3J 3A-3J
1A-1J 1A-1J
5-3. Proper
Address switches
RAM
Chip Locations
32K
1A-lJ
2A-2J
1A-1J
2A-2J
48K