Gateway ALR 9250R, User Manual

Page: 48 / 226

34 Gateway ALR 9250R User’s Guide
PCI slots B4 (top), B3, B2, B1, A3, A2, A1
The system board has two 32-bit peripheral component interconnect (PCI)
bus segments: PCI-A and PCI-B. These provide seven slots for PCI
expansion cards: three on PCI-A and four on PCI-B. PCI-B4 is shared with
the ISA slot. PCI-A1 supports half-length boards only. The other slots
support full-length boards. PCI bus features:
•
33 MHz bus speed
•
32-bit memory addressing
•
5 V signaling environment
•
Burst transfers of up to 133 MB/sec
•
8-, 16-, or 32-bit data transfers
•
Plug and Play ready
•
Parity enabled
Memory module connector
The memory module connector supports the memory module. The
memory module is a proprietary card that supports all of the main memory
for the system. The memory module is described in “Operating systems”
on page 41.
System management connectors
Server Management features are implemented using one microcontroller,
the system board management controller (BMC).
The BMC and associated circuitry are powered from the 5 V standby line,
which remains active when the system power is switched off.
The primary function of the BMC is to autonomously monitor system
management events and log their occurrence in the nonvolatile system
event log (SEL). These events include overtemperature and overvoltage
conditions, fan failure, or chassis intrusion. While monitoring, the BMC
maintains the nonvolatile sensor data record repository (SDRR), from
which run-time information can be retrieved. The BMC provides an ISA
9250R.book Page 34 Friday, April 9, 1999 9:44 AM