4) internal battery, 5) memory slots, 6) expansion slots – Toshiba Magnia 3310 User Manual
Page 54: 7) hdbp board

Getting Started
Inside the server
35
(4) Internal battery
The internal battery is the battery for backing up the RTC (Real
Time Clock). It also give timing signals for timesharing operation.
The battery is seated on the motherboard.
See “Replacing the internal battery” on page 110.
(5) Memory slots
Used to mount up to 6 memory modules to expand the server’s
RAM (Random Access Memory).
See “Memory module” on page 75.
(6) Expansion slots
Used to mount expansion cards. The motherboard has a total of
6 expansion slots: four 64 bit/100MHz PCI-X slots and two
32 bit/33MHz PCI slots. The PCI slots are compliant with PCI-
X 1.0a(PCI-X slots only) and PCI 2.2 standards.
See “Expansion cards” on page 129.
(7) HDBP board
Used to supply electric power to hard disk drives, etc.