By Karbo M.B.
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Extra resources for A complete illustrated guide to the PC hardware
In a modern Pentium driven PC, there are two or three different I/O busses: ● The ISA bus, which is oldest, simplest, and slowest bus. ● The PCI bus, which is the fastest and most powerful bus. ● The USB bus, which is the newest bus. It may in the long run replace the ISA bus. The three I/O busses will be described later. Here, we will take a closer look at the PC's fundamental bus, which the others are branches from: The system bus The system bus connects the CPU with RAM and maybe a buffer memory (L2-cache).
Non-intelligent. 1984 16 bit 8 MHZ 8 MBps MCA Advanced, intelligent bus. Used almost exclusively by IBM. 1987 32 bit 10 MHZ 40 MBps EISA Advanced, intelligent bus. Used by net servers. 1988 32 bit 8 MHZ 32 MBps VL Simple high speed bus Genuine local bus, synchronous with the CPU. 1993 32 bit Synchronous with the CPU: 25, 33 or 40 MHZ 100-160 Used in 486's. htm (4 of 8) [4/15/1999 6:18:24 AM] MBps An illustrated Guide to I/O-busses PCI Intelligent, advanced high speed bus. Standard with Pentium.
These tracks are used as: ● Data tracks, which each can move one bit at a time ● Address tracks, which identify where data should be sent to ● Other tracks for clock ticks, voltage, verification signals, etc. Wen data are sent on the bus, they must be supplied with a receiver. Therefore, each device on the bus has an address. Similarly, the RAM is divided in sections, each having its address. Prior to sending data, a number is sent on the address track, to identify where the data should be sent to.