Chapter 2. System Board Features
Network Connection
Some models have a Crystal CS8920 Ethernet 10BASE-T controller and an RJ-45 connector integrated on
the system board that provides a high-performance LAN connection. This integrated Ethernet is an ISA
Plug and Play device with built-in support for Wake on LAN.
Some models are equipped with an Ethernet or token-ring adapter.
Features of the Ethernet adapter are:
Operation in shared 10BASE-T or 100BASE-TX environment
Transmits and receives data at 10 Mbps or 100 Mbps
RJ-45 connector for LAN attachment
Operates in symmetrical multiprocessing (SMP) environments
Wake on LAN support
Remote Program Load (RPL) support
Note: The following information is for PC 300GL 6272 Without Diskette Drive computers:
For operation of the computer within FCC Class A limits, you must use category 5 network cabling
at 10 Mbps or 100 Mbps.
Features of the token-ring adapter are:
Transmits and receives data at 4 Mbps or 16 Mbps
RJ-45 and D-shell connectors for LAN attachment
Wake on LAN support
Remote Program Load (RPL) support
General Purpose I/O Ports
The system board has up to 16 general purpose input/output (GPIO) pins which are implemented by two
8-bit GPIO ports. The use of GPIO pins is dependent upon system design. Features of the GPIO ports
are:
Open-drain outputs with internal pull-ups and transistor-transistor logic (TTL) inputs
Base address is software configurable
Direction is programmable
Occupies 4-byte I/O address
Real-Time Clock and CMOS
The real-time clock is a low-power clock that provides a time-of-day clock and a calendar. The clock
settings are maintained by an external battery source of 3 V.
The system uses 242 bytes of memory to store complementary metal-oxide semiconductor (CMOS)
memory. Moving a jumper (J6) on the system board erases CMOS memory.
To locate the battery or J18, see “System Board” on page 13.
Chapter 2. System Board Features
11
