USB VERSIONS
USB 1.0 - The original release of USB supports 127 devices transferring 12 Mbps.
USB 1.1 - Also known as full-speed USB, USB 1.1 is similar to the original release of USB however minor modifications for the hardware and the specifications. This version of USB still only supports a rate of 12 Mbps.
USB 2.0 - USB 2.0 also known as hi-speed USB was developed by Compaq, Hewlett Packard, Intel, Lucent, Microsoft, NEC and Philips and was introduced in 2001. Hi-speed USB is capable of supporting a transfer rate of up to 480 Mbps and is backwards compatible meaning it is capable of supporting USB 1.0 and 1.1 devices and cables.BUS
|
Width (bits)
|
Bus Speed (MHz)
|
Bus Bandwidth (MBytes/sec)
|
8-bit ISA
|
8
|
8.3
|
7.9
|
16-bit ISA
|
16
|
8.3
|
15.9
|
EISA
|
32
|
8.3
|
31.8
|
VLB
|
32
|
33
|
127.2
|
PCI
|
32
|
33
|
127.2
|
64-bit PCI 2.1
|
64
|
66
|
508.6
|
AGP
|
32
|
66
|
254.3
|
AGP (x2 mode)
|
32
|
66x2
|
508.6
|
AGP (x4 mode)
|
32
|
66x4
|
1,017.3
|
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