IBM ThinkPad T23 2647 Supplementary Manual page 12

Features
Diskette drive
To get the best performance from your diskette drives, use high-quality
diskettes (such as IBM diskettes) that meet or exceed the following standards:
v 1-MB, 3.5-inch, unformatted diskette:
– ANSI (American National Standards Institute) X3.137
– ISO (International Standards Organization) 8860
– ECMA (European Computer Manufacturers Association) 100
v 2-MB, 3.5-inch, unformatted diskette:
– ANSI X3.171
– ISO 9529
– ECMA 125
External interface
v Serial connector (EIA-RS232D)
v Parallel connector (IEEE 1284A)
v External-input-device connector
v External-monitor connector
v PC Card slots (Type I, Type II, or Type III PC Card)
v Headphone jack
v Line-in jack
v Microphone jack
v Video-out connector
v Universal Serial Bus (USB) connectors
v UltraPort
v Infrared port
v RJ11 telephone connector (available if the modem feature is installed)
v RJ45 Ethernet connector (available if the Ethernet feature is installed)
v Ultrabay
v Expansion connector
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ThinkPad T23 Service and Troubleshooting Guide
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