What has replaced mainframes since the 1980-s?

Until the 1980-s mainframes didn't rule supreme in corporate data centers.

What has replaced MP3 music players, digital cameras, PDAs and several other devices, and has merged them all together?

Верно ли следующее утверждение:

To switch to Ipv6 all the interconnecting yet invisible devices will need to be upgraded or replaced.

Why did mainframes get their name?

There are no mainframes now in use worldwide.

IBM is the only big firm that still sells mainframes.

What did IBM do to get customers use mainframes for more functions?

IBM has never bundled mainframes with applications at a discount.

Some companies like mainframes because they are reliable and secure.

Why do some companies still run crucial applications on mainframes?