HP omnibook 4000 Service Manual

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Notebook Hardware Structure
Field Replaceable Assemblies
Installing memory
(End User Replaceable)
The OmniBook 4000 family has two memory locations for expanding  system RAM.
The memory location on the side of the OmniBook that has the battery also has the
factory RAM module installed.  To add an additional 8MB or 16MB of RAM, use the
location on the other side of the unit near the floppy drive.  If the base unit has
4MB or 8MB of memory, and you want to expand the memory to more than 20MB
or 24MB, then the original 4MB or 8MB module must be replace with a larger
module.
Figure 1 - Memory Doors, Modules, and Slots