Apple PowerBook 165 - Manual (Page 13)

Specifications Memory - 4
Memory
RAM
4 MB pseudostatic RAM (PSRAM) installed on the daughterboard
Expandable to 8 MB with 4 MB expansion card
Expandable to 14 MB with third-party PSRAM expansion cards
ROM
1 MB
PRAM
256 bytes of parameter memory
VRAM
128K of static video display memory
Clock/Calendar
CMOS custom chip with long-life lithium battery