First Quadrant Option (Revision E Board Only) - NorthStar HORIZON Random Access Memory User Manual

3.4 FIRST QUADRANT OPTION
The First Quadrant option is only available on the
revision E HRAM board and is used only with the 48K
version of the board. When the option is implemented,
it causes the board to respond to the last 48K of the
memory address space (4000H through FFFFH) instead of
the first 48K (0000H through BFFFH).
This
plugs in area JP4. Table 3-3 shows the standard and
alternate positions of the jumper plugs in this area
and the resulting memory configurations. The shaded
blocks in Table 3-3 indicate those quadrants to which
the board can respond.
HRAM
option is implemented
The First Quadrant Option
Jumper Area
JP4
STANDARD
ALTERNATE
by changing
Table 3-3
48K Memory Configuration
Q1 Q2 Q3
Q2 Q3
Q1
USER/TECHNICAL MANUAL
the jumper
Q4
Q4