Intel SYSTEM 310 Hardware Integration Manual page 27

System 310
Parts of the Chassis
POWER SUPPLY
The power supply, located underneath the Winchester disk drive,
furnishes all the DC current for the System 310. The AC power panel
routes and filters AC to the power supply. The power supply then
converts AC to +5, -12, and +12 volts of DC used by all parts of the
system, such as the circuit boards and disk drives. The power supply
is not user-serviceable and should be replaced only by qualified
service personnel.
This compact switching supply provides not only enough power to run
the basic unit, but also enough power so you can change peripherals
and run as many as
seven
MULTIBUS-compatible
boards
simultaneously. Chapter 3 contains more information about the AC
and DC power specifications.
CARDCAGE AND BACKPLANE
The cardcage and backplane assembly houses and protects circuit
boards. Boards plug into the card edge connectors on the backplane,
shown mounted on the back of the cardcage in Figure 5-5. While you can
modify the number of boards in the cardcage, you will not need to
replace this assembly because it accommodates any configuration of
the System 310 that meet the system specifications (listed in Appendix
A).
Besides physically supporting the circuit boards, the backplane
distributes digital signals and DC power to circuit boards and
peripherals, prioritizes bus accesses, and structures the system
interrupts.
To prioritize bus accesses, the backplane contains two sets of
jumpers: the priority jumpers and the interrupt jumpers. The priority
jumpers, shown in Figure 5-5, determine which bus master board may
have access to the system bus in case of contention. Priority jumpers
are preset so that the topmost slot, slot 7, has the highest priority.
Chapter 5 explains how to change these jumper settings. Chapter 3
contains more information on bus priority.
To structure the system interrupts, the backplane also contains
several interrupt jumpers. In preconfigured systems, the interrupt
switch on the front panel is connected to the system bus with a
jumper at interrupt 1 (INTI/) on the backplane. Refer to Chapter 3
for more information on how the System 310 uses interrupts and how
you can change the settings.
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