A modem for use in a laptop or other computer with a PC Card (PCMCIA) slot. Modem PC Cards come in landline and wireless varieties, the latter enabling you to connect to a specific cellular or ...

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.

The Tsushin Booster for the PC Engine is one such project ... It seems like a rather unlikely product: a modem attachment for a games console with an added 32 KB of battery-backed SRAM.