Chapter 2. System Board Features
When the computer is started, the resource assignments are subject to change during POST.
System Board
The system board contains all the cable connectors for the system. The following illustration shows the
physical layout of the system board:
Physical Layout
The following is an illustration of the IntelliStation M Pro system board. A diagram of the system board,
including switch and jumper settings, is attached inside the computer.
Table 9 (Page 2 of 2). System Resource Assignments for the System Management Controller
Resource
Resource Assignment
DMA
None
.1/
Auxiliary power connector
.2/
Primary microprocessor socket
.3/
Power connector
.4/
Secondary microprocessor socket
.5/
DIMM sockets
.6/
Secondary IDE connector
.7/
Diskette drive connector
.8/
Primary IDE connector
.9/
Channel A SCSI Connector (68 pin)
.1ð/
Channel B SCSI Connector (50 pin)
.11/
Channel B SCSI Connector (68 pin)
.12/
CMOS clear (password) jumper
.13/
Rocker switches
.14/
Battery
.15/
RAIDport extension
.16/
ISA slot connectors
.17/
PCI slot connectors
.18/
AGP slot connector
Figure 1. System Board
Adapters plug into the ISA- or PCI-expansion connectors (slots) on the system board. Signals from
adapters are routed to the ISA or PCI buses. Each ISA-expansion connector provides a 16-bit-wide data
path, and each PCI-expansion connector provides a 32-bit-wide data path.
The following table shows the number of ISA, PCI, and shared ISA/PCI expansion slots provided with
IntelliStation M Pro computers. Shared slots will accommodate either an ISA adapter installed in the ISA
connector, or a PCI adapter installed into the PCI connector. Shared slots cannot accommodate ISA and
PCI adapters at the same time.
Each PCI-expansion connector is capable of driving one, low-power Schottky load. Each ISA-expansion
connector is capable of driving two, low-power Schottky loads. The ISA bus is permanently set to the PCI
bus speed divided by four.
The PCI bus shares interrupts with the ISA bus. Free interrupts are automatically assigned to PCI devices
during POST. If no interrupts are available for the PCI devices, an 18xx POST error message is
generated.
Chapter 2. System Board Features
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