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Figure 1-2 (Part 2 of 2). System Board Devices and Features
Device Type Features
Interrupt controller 1 15 levels of system interrupts
(interrupts are edge-triggered)
Keyboard/auxiliary
device controller
1 Internal keyboard
TrackPoint
Auxiliary device connector
Password security
Diskette drive
controller
2 Supports:
3.5-in. diskette (1.44 MB)
3.5-in. diskette (1.2 MB)
3.5-in. diskette (720 KB)
Serial controller
port
2 EIA-232-E interface (16550 compatible)
Programmable as serial port 1, 2, 3, or 4
One 9-pin, D-sub connector
Parallel controller
port
1 Programmable as parallel port 1, 2, or 3
IEEE P1284-A compatible
Supports bidirectional input and output
Enhanced Parallel Port (EPP) compatible
Extended Capabilities Port (ECP) compatible
Expansion bus
adapter (PCI-bus)
– Supports externally attached devices:
SelectaDock docking system
Port replicator
PCMCIA** slots – Conforms to the standards for:
CardBus
Two Type I or II PC cards
One Type III PC card
Modem subsystem – Is driven by:
MDSP 3780i
SRAM 32 Kb by 40 bits
Crystal Audio
Voice band CODEC for modem
Internal DAA
Internal omnidirectional microphone
Infrared subsystem – Supports:
ThinkPad IR/SIR/D-ASK (500 KHz) IR
Universal serial bus
(USB)
– Supports:
USB input and output devices
1-4 System Overview