Also called the "system bus," it is the pathway between the CPU, memory and peripheral devices. In the early 1990s, when the higher-speed VESA local bus (see VL-bus) was introduced, which ran at the same speed as the system bus, the term was popular for a while. See bus and PC data buses.
Peripheral controller cards plug into slots on the local bus.
Bus Speed Comparisons
Bus type Width Speed Total rate
ISA 16 bits 8 MHz 16MB/sec
EISA 32 bits 8 MHz 32MB/sec
VL-bus 32 bits 25 MHz 100MB/sec
VL-bus 32 bits 33 MHz 132MB/sec
PCI 32 bits 33 MHz 132MB/sec
PCI 64 bits 33 MHz 264MB/sec
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