HP J Class Owner's Manual page 168

Any Combination of memory may be used, although, for maxi-
mum performance, we recommend using common-sized memory
SIMMs; either all 32 MB or 128 MB SIMM pairs. Therefore, to
achieve both maximum performance and maximum future ca-
pacity, use 128 MB SIMM pairs exclusively.
Figure A–22. Memory SIMM Sequence
9.
Open the ejector tab by pressing down on it at the left of the con-
nector. Refer to Figure A–23.
B-40