Normally means "usually" or "generally". You do not want to change it to an adjective. It is not modifying "slaves".
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Standard USB uses a master/slave architecture; a host acts as the master device for the entire bus, and a USB device acts as the slave. Devices are designed from the start to act in one role or the other – computers are generally set up to be hosts, while printers (for instance) are normally slaves.
Why does this adv mean in above sentences?
Can I change the adv to adj? Such as "normal"!
Is it modifying "are"?