Amazon.com: Letotech Cross Wired USB Serial Cable DB9 CP2102 ZT232 USB RS232 to DB9 Null Modem Cable PC Control TV Cable (Null Modem Pinout) : Electronics
360815-001 Compaq / Microcom PCMCIA Laptop Data Fax Modem 33.6/ 28.8 Kbps, New | eBay
Tripp Lite 6ft Null Modem Serial DB9 RS232 Cable Adapter Gold M/F 6' - null modem cable - DB-9 to DB-9 - 6 ft - P454-006 - Serial Cables - CDW.com
Microcom TravelCard P - Data Fax/Modem - PCMCIA Card | eBay