System Base I/O Board - Silicon Graphics Prism Hardware User's Manual

2: System Overview

System Base I/O Board

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The base I/O board is the full-length PCI board that is installed in PCI slot 1, (the top PCI
slot). It provides the following I/O connectors and interfaces for the system (see
Figure 2-4):
• An internal IDE connector for the internal DVD-ROM drive
• Internal serial ATA connectors for the hard disk drives
• An external 36-pin MDR connector for optional external serial devices
Note: The 36-pin connector uses a four-cable adapter with four 9-pin serial
connectors.
• Real time interrupt in and out connectors (RTI input and RTI output) located on the
left side of the PCI card (these connectors are not currently supported)
• A 10/100/1000-BaseT Ethernet connector (RJ45)
The I/O board also contains the non-volatile RAM and time-of-day clock for the system.
For technical specifications and pinouts of these connectors, see Appendix A, "Technical
Specifications and Pinouts."
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