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RS232 standard is legacy, com ports are serial using a 9 pin connector used by modems and other devices
In windows speed set in bits per second - 75 bps to 128,000 - 9600 bps common for devices other than modems
data chunks sent in 7 0r 8 bits
HUB host controller contains root hub.
root hub is like an expansion bus
all usb connect to the root hub ports
all devices share the same bandwidth
USB 1.1 first widely used standard in 1.5 and 12 Mbps
USB 2 backward comp - 480 Mbps
To get high speed device must be plugged into Hi speed port
Speed is total speed of bus - most systems support both
USB 3 - called superSpeed - 5 Gbps, are blue, are different from the other two and not backward comp
ps2 port is also known as mini din
USB in theory can support 127 devices but that's not practical because bandwidth is shared
USB 1 and 2 can not exceed 5 meters
USB connectors - A plugs into device, B into PC, micro and mini are for laptop and other portable
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