A PC that does not contain earlier peripheral drives or ports. Legacy-free PCs use USB ports instead of serial and parallel ports. They do not have a floppy drive, but typically do have analog modem and Ethernet ports. Should an older device need to be plugged into a legacy-free PC, there are adapters for serial and parallel ports to USB.

High-Tech One Day; Legacy the Next
ISA used to be the primary expansion bus in a PC. When it was superseded by PCI, ISA became legacy. PCI used to be the primary socket for a display adapter, but was superseded by AGP and later PCI Express.