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The following sections describe base system components and options.
1.3.1 Base System Components
Base system components include the following:
•
Central processing unit (CPU)
•
Console serial line unit (SLU)
•
Main memory
•
Mass storage devices and controllers
•
Power supplies
•
Fans
1.3.1.1 Central Processing Unit (CPUj
The central processing unit (CPU) controls the execution of all instructions
and processes. The CPU circuits contain the logic, arithmetic, and control
functions used by the system.
1.3.1.2 Console Serial Line Unit (SLU)
Each system has a serial line unit (a line on which each bit of information
is sent sequentially on a single channel) connecting the console terminal to
the CPU module. The SLU connector (an MMJ) is located on the CPU cover
panel. The console serial line provides a means of communicating with the
CPU.
1.3.1.3 Main Memory
Main memory provides the physical storage area for data and instructions
used by the CPU. When you start your system, the operating system is
loaded into main memory. Any application programs must also be loaded
into memory.
When the system cannot load everything into memory at once, it reads in
units of data called pages (512 bytes of data) from disk. Having a larger main
memory increases the efficiency of processing, since fewer pages must be
copied to and from disk. Each configuration comes with a standard memory
option that you can upgrade to increase efficiency.
The contents of memory are volatile. This means they are lost when you
turn off power to the system. Use mass storage devices, such as fixed disks
and tape cartridges, to store software and data permanently.
1-24 MicroVAX 3600 VAXserver 3600/3602 Operation
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