On a standard Atx Motherboard IDE specifies that no more than 2 devices per bus, so if you have a 2 IDE bus computer you can have 4 devices. Some computers have 4 IDE busses in which case you could have 8 devices (these use a 'Promise IDE raid chipset')
This is just recommended specifications at least, you can always hack and try for more off record lol
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Well firewire can support up to 64 and usb can support 128
It is the IP ADDRESS which uniquely identifies any computer conected to internet. It gives the location of the computer also.
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There is no such standard. Fire alarm control panels are typically customized for as many loops as necessary for the structure. It may have one loop or a hundred or anything in between.
8 devices:)
The number of devices you can link to a router will depend on the specific router,typically 4 devices can be connected.
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