SENS Q-1 < 11 - 11 >
11. References
Firmware
Low-level software that controls the hardware. Firmware is a combination of software and hardware.
The name, 'Firmware', is used because it is partly hardware and it is partly software that controls the
underlying hardware of the system.
GPS (Global Positioning System)
GPS is a worldwide positioning system that was developed by the US. Department of Defense in the
1970s. In addition to military purposes, it is permitted to use GPS for general purposes. The error
limit is 50m for military purposes and 200m for general purposes. The DGPS system has been
developed to reduce errors even for general purposes.
Memory Module
An extension board with RAM chips on it.
Bandwidth
The number of bits that can be continuously transmitted or received per second. The higher the
bandwidth the more efficient as data can be transferred in a shorter time.
Address Bus
The data bus used to specify the address of an input or output device or memory by the CPU.
Control Bus
The data bus used to transmit control signals by the CPU so as to notify the storage device, input
or output, of the current status or changes.
rpm (revolutions per minute)
This refers to the speed of reading data saved on the platter of a hard disk drive. It is also called
revolutions per minute or disk revolutions per minute.
Platter
This refer to plates that are included on a hard disk drive and used to record data. Generally, a
hard disk drive consists of 2 to 8 platters.
Device
It refers to an electric or mechanical instrument. In PCs, it refers to the active devices used in
electric circuits such as transistor, ICE, etc.
Resistance
An electric characteristic that hinders current flow. All materials except for superconductors have
electric resistance. The symbol is ‘R’
.
The unit is ‘
Ω
’.
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