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EISA bus
The EISA Bus Standard
For high performance applications such as ?network file servers, communication servers, and other multitasking systems the ISA bus is not good enough for the speed of data transfer which is the most important application of a BUS.
As the name suggests, the EISA bus is an extension of the ISA bus developed to satisfy the requirements of the old and almost ancient 386 and 486 processors and ?multimaster systems. The EISA bus uses edge connectors of the same physical size as the ISA bus so that either ISA or EISA boards can be inserted in the slot.
However, the EISA has 2 level of contacts. If an ISA based board is inserted, it will go in the connectors only far enough to reach the top level of contacts which contain the ISA bus signals. A notch cut out in the EISA boards allows them to go into the connectors far enough to also contain additional EISA signals.
One important feature of the EISA bus is that its interrupts can be individually programmed as edge triggered for compatibility with ISA boards or level triggered so that they are less susceptible to ?noise spikes and they can be shared by several sources.
When the CPU detects an interrupt it polls each board or device to determince the source of the interrupt.
To help implement an EISA bus in a system, Intel introduced the 82358 Bus controller.
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EISA bus
The EISA Bus Standard
For high performance applications such as ?network file servers, communication servers, and other multitasking systems the ISA bus is not good enough for the speed of data transfer which is the most important application of a BUS.
As the name suggests, the EISA bus is an extension of the ISA bus developed to satisfy the requirements of the old and almost ancient 386 and 486 processors and ?multimaster systems. The EISA bus uses edge connectors of the same physical size as the ISA bus so that either ISA or EISA boards can be inserted in the slot.
However, the EISA has 2 level of contacts. If an ISA based board is inserted, it will go in the connectors only far enough to reach the top level of contacts which contain the ISA bus signals. A notch cut out in the EISA boards allows them to go into the connectors far enough to also contain additional EISA signals.
One important feature of the EISA bus is that its interrupts can be individually programmed as edge triggered for compatibility with ISA boards or level triggered so that they are less susceptible to ?noise spikes and they can be shared by several sources.
When the CPU detects an interrupt it polls each board or device to determince the source of the interrupt.
To help implement an EISA bus in a system, Intel introduced the 82358 Bus controller.
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