IBM 6644 - Manual (Page 16)

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Keyboard and mouse features
• IBM Preferred USB (Universal Serial Bus) Keyboard
• IBM Rapid Access™III USB (Universal Serial Bus) Keyboard
• Two USB connectors on the Rapid Access III keyboard
• IBM ScrollPoint™ III USB (Universal Serial Bus) Mouse
• IBM Sleek USB (Universal Serial Bus) Mouse (some models)
Expansion capability
• Two low-profile PCI adapter expansion slots (one available)
• Five USB connectors
• Two DIMM sockets (one available)
Power
• 95 watts
• Manual switch between ranges, 90–137 or 180–265 V ac
• Automatic switching, 57–63 or 47–53 Hz input frequency range
• Built-in overload and surge protection
• Advanced Power Management support
• Advanced Configuration and Power Interface (ACPI) support
Security features (varies by model)
• Power-on and administrator passwords
• Cover lock (some models only)
• Startup sequence control
• Unattended start mode
• Diskette and hard disk I/O control
• Alert on LAN
Supported operating systems
• Microsoft Windows 2000 Professional