Specifications

Computer Architecture and Maintenance (G-Scheme-2014)
The signalling voltage does not equal the voltage of the motherboard power supply
but rather the voltage threshold for the digital encryption of data.
There are 2 types of 32-bit connectors:
• 32-bit PCI connector, 5V:
• 32-bit PCI connector, 3.3V:
The 64-bit PCI connectors offer additional pins and can accommodate 32-bit PCI cards.
There are 2 types of 64-bit connectors:
• 64-bit PCI connector, 5V:
• 64-bit PCI connector, 3.3V:
Q.What is ISA?List Feature of ISA Bus?
Ans.The Industry Standard Architecture or ISA bus began as part of IBM's
revolutionary PC/XT released in 1981. However, it was officially recognized as "ISA" in
1987 when the IEEE (Institute of Electrical and Electronics Engineers) formally
documented standards governing its 16-bit implementation.
This first XT bus was intended to allow the addition of system options which
could not be fit onto the motherboard.
This XT bus was completely under the microprocessor's direct control, and its
addressing width was limited to the 8-bit level of the processor.
To make the bus useful, control lines were added to signal interrupts for
input/output ports. Bus speed was also limited to match the processor. The PC/XT's
8088 was a one-byte wide 4.77 MHz processor. Thus the XT bus, which required two
clock cycles for data transfer, was limited to an excruciatingly slow (by today's
standards) 2.38 Mbps, that could be curtailed even further if the system was busy with
other tasks.
Prepared By – Prof. Manoj.kavedia (9860174297 – 9324258878 ) (www.kavediasir.yolasite.com)
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