Typically available as an external USB module, for desktop computers, the modem may also be available on a PCI or PCI Express (PCIe) card that plugs into an empty slot on the motherboard.

[Jake] has the king of the Newtons – a MessagePad 2100. There’s a hidden port in this machine for a modem card, but Apple never made one. While other Newton aficionados trudge along with old ...

A combination fax board and data modem available as an external unit that plugs into the serial port of the computer or as an expansion card for internal installation. It includes a switch that ...