![background image](http://html1.mh-extra.com/html/ibm/thinkpad-770/thinkpad-770_user-manual_4037802046.webp)
External interface
Serial connector (EIA-RS232D)
Parallel connector (Centronics)
External input-device connector
External-monitor connector
External-diskette-drive connector
Expansion connector
PC Card slots (two Type I or Type II PC Cards, or one Type III
PC Card)
Headphone jack
Microphone/line-in jack (supports a dynamic microphone or a
self-battery-powered condenser microphone)
Infrared port
Universal Serial Bus (USB) connector
Telephone connector
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IBM ThinkPad 770E/770ED User's Guide Supplement