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system bus

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When discussing the bus on a motherboard, what is meant by the term "System BUS" ?

One more question. On a new system board, if it has an ISA slot, (in addition to PCI and AGP) what speed would the ISA bus run at?

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by thechas

The system bus is the data lines between the cpu, and the chipset, or system devices. There are usually 2 chips referred to as the North bridge and the South bridge. These chips bridge the date from the system bus to the other data busses and devices.
The PCI bus is a secondary bus off of the chipset, as is the ISA.

On most MB, you have some ability to adjust the ISA buss speed for optimum performance.
It usually runs at speeds from the original standard of 4.77 MHz to a maximum of 33 MHz (1/2 PCI) Most ISA cards stop responding at around 12 -15 MHz.

by dmiles

System Bus,also known as the Internal Bus,ios the maze of wires on the motherboard.
Internal bus-Interconnects main memory,the CPU, and all other components on the motherboard

The ISA operates at its own speed,thus came the development of the EISA,32-bit data bios which uses a 8mhz bus clock

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