Topic summary

Serial card

Extracted from the Wikipedia article Serial port.

Hardware

An IBM PC serial card with a 25-pin connector (obsolete 8-bit ISA card)
A PCI Express ×1 card with one serial port
A four-port serial (RS-232) PCI Express ×1 expansion card with an octopus cable that breaks the card's DC-37 connector into four standard DE-9 connectors
A converter from USB to an RS-232 compatible serial port—more than a physical transition, it requires a driver in the host system software and a built-in processor to emulate the functions of the IBM XT compatible serial port hardware.
UART to USB adapter