HP 98568A Installation Instruction page 60

Installing RAM in a Model 330
4. Remove the HP 98258A add-on RAM board. Reverse the switch settings of
your add-on RAM board and your built-in RAM. When done, your built-in
RAM should be set to:
and your add-on RAM board should be set to:
5. Re-insert your add-on RAM board into the computer.
6. Turn your computer on and hold down the space bar a few seconds. Verify
that you still have 8 Mbytes of RAM installed by looking at the amount of
RAM shown on the display.
7. Run your benchmark program several times to determine its average execute
time.
8. Compare the program's performance under each RAM configuration and
choose the fastest one.
3-12 Adding RAM