NorthStar HORIZON Random Access Memory User Manual page 16

Jumper Plug Areas and Memory Address Switches
Component
S1, S2 - Select the active memory areas.
JP1 - Selects the bank status on reset and selects
I/O control bits for bank switching and
parity.
JP2 - Selects areas to be bank switched.
JP3 - Selects the parity error response.
JP4 - Implements the First Quadrant option.
JP6 - Reserved for future use. Do not install
a jumper plug at this location.
HRAM
Figure 3-1
USER/TECHNICAL MANUAL