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Section 3. Subsystems
Video Subsystem . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Video Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Modem Subsystem . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
ThinkPad Modem . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
MIDI Port Function ........................ 3-5
Sound Blaster Support Function ................ 3-5
Telephony (Modem) Function .................. 3-6
Audio Subsystem . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
MIDI Port Function ........................ 3-7
Sound Blaster Support Function ................ 3-7
Audio Port Specifications ..................... 3-8
Infrared (IR) Subsystem ....................... 3-9
IRQ Level and DMA Channel .................. 3-9
Enhanced Video Subsystem ................... 3-10
Video Port Specification .................... 3-10
PCMCIA Subsystem . . . . . . . . . . . . . . . . . . . . . . . . 3-11
Pin Assignments . . . . . . . . . . . . . . . . . . . . . . . . . 3-12
IDE Channel on the UltraBay II .................. 3-14
MIDI/Joystick Port . . . . . . . . . . . . . . . . . . . . . . . . . 3-14
MIDI Interface . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14
Joystick Interface . . . . . . . . . . . . . . . . . . . . . . . . 3-14
This section describes the video, DSP, Audio, IR, Enhanced video,
and PCMCIA subsystems of the ThinkPad computers.
Copyright IBM Corp. 1997 3-1