Apple manual , Memory

Specifications Memory - 4
Memory
RAM 210/230/250 4 MB RAM soldered on the logic board
Expandable to 24 MB
Requires 70 ns or faster RAM chips
RAM 270c
4 MB RAM soldered on the logic board
Expandable to 32 MB
Requires 70 ns or faster RAM chips
RAM 280/280c
4 MB RAM soldered on the logic board
Expandable to 40 MB
Requires 70 ns or faster RAM chips
ROM 1 MB