DECstation 5000/260, Руководство оператора, Страница: 116 / 215

8.2 Main Parts of the System Unit
You can improve your workstation’s performance by replacing or adding the
following internal options:
• Memory modules
• Nonvolatile random-access memory (NVRAM) module
• CPU module
• TURBOchannel option modules
8.2.1 The Base System Module
The base system module contains
• CPU module slot
• 15 memory module slots
• 256-kilobyte power-up self-test and bootstrap read-only memory (ROM)
• System control and status registers
• System clock and 50-byte battery-backed-up random-access memory (RAM)
• Two synchronous/asynchronous RS232 serial communication ports
• Serial line interface for keyboard and mouse or other pointing device
• Network interface for ThickWire Ethernet
• Small computer system interface (SCSI-2) for up to seven devices
• Three TURBOchannel option slots
• Interrupt halt switch
8.2.2 Memory Modules
Your workstation comes with at least 32 megabytes of memory. The amount
of memory can vary, depending on what memory modules you ordered for your
workstation. The memory modules plug into the memory slots on the base
system module. You can expand your workstation’s memory to a total of 480
megabytes by installing up to fifteen 32-megabyte (MS02-CA) single in-line
memory modules. All memory modules in your system unit must be the same
type and have the same capacity. (The MS02L-AB, MS02-AA, and MS02-AB
are compatible.)(See Chapter 9 for instructions on installing memory modules.)
Inside the System Unit 8–3