MOTHERBOARD. MOTHERBOARD. MOTHERBOARD. holds the processor, memory and expansion slots and connects directly or indirectly to every part of the PC. include a small block of ROM . The ROM contains the PC’s BIOS. BUS. A bus is a channel over which information flows.
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The ROM contains the PC’s BIOS.
A bus is a channel over which information
The wider the bus, the more information can flow over the channel, much as a wider highway can carry more cars than a narrow one.
The original ISA bus on the IBM PC was
8 bits wide.
The universal ISA bus used now is
The other I/O buses (including PCI)
are 32 bits wide.
The memory and processor buses on Pentium and higher PCs are 64 bits wide.
is a computer bus standard for attaching peripheral devices to a computer motherboard.
is a bus standard for IBM compatibles that extends the XT bus architecture to 16 bits. It is designed to connect peripheral cards to the motherboard.
is a high-speed computer bus standard for attaching peripheral devices to a computer motherboard, dedicated primarily to assist in the acceleration of 3D computer graphics.
The CPU completes a set of four
Control Center of the Computer
The Brains of the Computer –
interprets and issues instructions
The Arithmetic/Logic Unit (ALU)
is a component of the CPU which performs arithmetic, comparisons, and logical operations.
Electronic circuits can exist in only one of two states: ON or OFF.
Binary coded decimal (BCD) is a numeral system used in computer memory. In BCD, numbers are represented as decimal digits, and each digit is represented by four bits:
Digit Bits Digit Bits 0 0000 5 0101 1 0001 6 0110 2 0010 7 0111 3 0011 8 1000 4 0100 9 1001
28 = 256
216 = 65536
ASCII is a seven-bit code
it uses the integers representable with seven binary digits
(a range of 0 to 127 decimal) to represent information.
i.e. 0000000 to 1111111
+ 1*22 =
+ 1*21 =
+ 0*20 =
Click here to decode