what things are considered when choosing a computer
comfort
cost
quality
purpose
how does a computer work
it uses an input device, like a keyboard, to receive data. it then converts the alphanumeric info that we provide into a binary code
what is analog and digital data
a- data represented by continuous variable physical quantities
d- data in the form of binary digits, there is a discrete amt of values available
what is a binary code?
a series of 1s or 0s
what is a bit? byte?
bit- a sungle unit of data, 1 or 0
byte- 8 bits
1 byte= 1 alphanumeric character
what is memory of a computer in?
kilobytes, megabytes, or gigabytes
what is the case of a computer
a metal protective case that protects interior components by keeping them cool, clean, and safe. it also shields from radio frequencies being emitted by computer
what is the mother board
contains the central processing unit (CPU), input/output sys (BIOS), memory, bus, and ports.
describe the central processing unit
CPU is a small chip located in the motherboard that consists of the control unit and arithmetic/logic unit which are connected by a bus.
it functions in preforming computations and supporting memory
what is the function of CPU?
reads data from storage, manipulate data, and then returns it to storage or an external device (monitor)
what can CPU do?
transfer data
preform math
compare data
change address of instruction
what is the basic inout/output sys (BIOS)
contains a simple set of instructions for the comp to help start up the computer.
oversees basic functions like receiving singnals from keyboard
what is the intermediary between operating sys and hardware
BIOS
what is BUS? why is BUS speed important?
a series of connections, controllers, and chips that allow flow within comp
speed is critical to how fast the computer sys can function
what are ports? whats the most common?
a collection of connecters sticking out the back or side of comp that link adapters, drives, printers, keyboards, ect
USB
what are types of ports? what type of port is on the mmotherboard?
parallel
serial
USB
IDE
SCSI
IDE
what is random access memory? (RAM)
prov temp storagw of instructions currently being used and processed by comp. once computer is turned off RAM is wiped clean
what are diff types of RAM
DRAM
VRAM
SDRAM
what is read only memory ROM? whats it used for
memory only CPU reads from. it is permanent and cant be erased.
used to store freq used programs
CD/DVD drives
stores large amts of data for longterm storage. used to save, transport, ot archive infor
what are CD/DVD drives made from and what are the 3 types?
polycarbonate platic disks
ROM- read only mem
R- write once ready many times
RW- read and wrote many times
do CD or DVD hold more mem
DVD
what is the complementary metal oxide semiconductor CMOS
a type of memory chip that uses a small rechargeable lithium battery to retain info abt the PC’s hardware when comp is off
keeps track of date and time (and other stuff) and will have it refreshed by comp turned back on
what is the operating sys
software that controls comp hardware ad acts as bridge between applications and hardware
