11.   Is there any benefit to getting an external modem that would justify the extra cost?

12.   Meanwhile, users can buy external modems about the size of a pack of cigarettes, or PC Card modems that slide into a laptop slot.

13.   Most external modems will work with either a Mac or an IBM-compatible computer.

14.   On the downside, external modems take up space on your desk and they require an electrical outlet.

15.   Serial ports accommodate the mouse and external modem.

16.   The radio modems are about the size of a paperback book, weigh about a pound and attach to a portable computer much like a traditional external modem.

17.   With external modems, turn the power off to the modem.

18.   With external modems, check the serial port cable that connects the modem to your PC.