So if all you've got is a serial interface, well, that's the best it can do.

A serial interface was included for connecting to a computer.

A serial interface, on the other hand, must send the bits down its single wire one after the other.

It also had a serial interface for a Teletype.

This allows any robot that has a serial interface to be controlled through the low-cost Fluke.

This is useful as many circuits work on groups of bits in parallel, but serial interfaces are simpler to construct.

It also had a serial interface and an IR port for communicating with other devices.

The smart card uses a serial interface and receives its power from external sources like a card reader.

Another approach to realize serial high-speed interfaces were so-called switched fabrics, which used additional switches and bridges to connect to each other.

(As for all bit serial interfaces above, each drive also has an additional power cable, usually direct to the power supply unit.)