I have an old 350Mhz Macintosh G4 Tower that came without an internal
modem. Now I'd like to put a 56K modem into it, or failing that, find a
cheap, compatible external modem. What internal modems are compatible
with my computer and where can I buy one?

Expansion Issues
http://developer.apple.com/documentation/Hardware/Developer_Notes/Macintosh_CPUs-G4/Original_PowerMac_G4/G4Rev2-9.html

"Proprietary Modem Slot
The 70-pin modem connector in the Power Mac G4 computer is the same as
the connector on the modem slot in the blue-and-white Power Macintosh
G3 computers. The modem slot is a proprietary design specifically for
Apple modem cards."


These are basically the same modem, and should work with your Mac.


Apple 56K internal Modem G3 B/W, G4 (PCI) 
http://www.welovemacs.com/306600.html


"Macintosh G3 Blue & White and G4 (PCI)Global Village TelePort 56K Modem

    * Turn Your NEW Power Macintosh G3/G4(PCI)into a speed demon!
    * Send, receive, view, print and manage faxes right from your Macintosh!
    * On-screen assistant guides you quickly
    * step-by-step through setup of your GlobalFax software
    * Monitor fax connection status and performance information
conveniently in any application.
    * QuickFax, Press two keys to send a fax from your Global Village Fax Center
    * Apple Guide on-line help
    * Standard analog phone line
    * Internet access speeds Up to 56,000 bps
    * Data modem transmission speeds of Full duplex at 33,600 (V.34
annex 12), 28,800, 14,400, 9600, 4800, 2400, 1200 and 300 bps
    * Fax speeds of 14,400, 12,000, 9600, 7200, 4800 and 2400 bps
    * Upgradable Flash ROM and flash DSP
    * Manufactured by Boca Research
    * New-OEM Packaging includes: Modem and Ribbon Cable, Manual,
Modem cord, Registration card and Global Fax Software with a Five-year
limited warranty through manufacturer
    * Compatible with G4 PCI Graphics only and Power Macintosh G3 Blue
and White with internal COMM slot running System software version 8.5
or later, 4MB RAM and 8MB hard disk space.
[...]
$39.99"


Original Global Village TelePort Internal 56K V.90 Modem
http://www.welovemacs.com/306600nib.html

"Original Global Village TelePort Internal 56K V.90 Modem for G3/G4 (PCI)
[...]
    * New Box Packaging includes: Modem and Ribbon Cable, Manual,
Modem cord, Registration card and Global Fax Software with a Five-year
limited warranty through manufacturer
    * Compatible with G4 PCI Graphics only and Power Macintosh G3 Blue
and White with internal COMM slot running System software version 8.5
or later, 4MB RAM and 8MB hard disk space
    * Global Village original!
    * New, in box
    * This kit includesthe Award Winning GlobalFax software, a $49.99 value!"


They are widely available, and you should shop around for the best deal.


Almost any external modem will work, provided that you have the correct cable.


SEARCH TERMS

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hlabadie-ga

Thanks hlabadie-ga, you answered my question quickly and thouroughly.

Thank you for the tip and the rating.

hlabadie-ga