The Hardware and Networking tutorials by Bitla. You will rarely find any detailed explanation of this kind. Even more you can ask question/doubts which will answered in 12 hours(max)
Only keyboard connector integrated onto system board
Two power cables connect to the system board (sometimes called the P8 and P9 connectors)
Power supply provides 5 Volts (DC) and 12 Volts (DC) to the system board
CPU sits in front of expansion slots (longer cards don't fit)
Cannot be used with smaller cases or newer AT and ATX cases
ATX and Mini-ATX
Measures 12" x 9.6" (Mini-ATX measure 11.2" x 8.2")
Most common form factor
CPU and memory slots sit beside expansion slots
Power supply blows air into case to cool processor
Soft switch or soft power available (an OS can turn off the computer)
LPX
Designed for slimline desktop-style computers
Uses a riser card in the middle of the system board (A riser card is a card that attaches to the system board at a right angle. Expansion slots are located on the riser card rather than the system board.)
Riser card does not have built-in ports for audio, joystick, USB, network, and modem
NLX
Designed for slimline desktop-style computers
Uses a riser card on the edge of the system board
Riser card may have built-in ports for audio, joystick, USB, network, and modem
You should also know the following facts about motherboards:
Pentium system boards use a combination of PCI and ISA expansion slots
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