No expansion slots, and built-in ports for pseudo-plug and play ease of use.

The simplest way to distinguish a New World ROM Mac is that it will have a factory built-in USB port.

Still, the Thinkpad 240 eliminates the need for a replicator attachment altogether by offering a nice array of built-in ports.

The simplest way to identify an Old World ROM Mac is that it will not have a factory built-in USB port.

In another mode, its built-in USB port can be used to attach a printer, creating a print server.

It also features a built-in port that permits a more direct connection to a car's stereo system.

The keyboard is also backlit, so you can see the keys when the lights are off, and include 2 built-in USB ports.

Like the standard TI-84 Plus, the Silver Edition includes a built-in USB port, a built-in clock, and assembly support.

Both have a built-in USB port for transferring files to a PC without using a cable.

Produced by Moixa, the rechargeable cartridge comes in the AA battery size, and can be charged via a computer using a built-in USB port.