Technical information

CHAPTER 3
Devices and Ports
Trackpad 39
The built-in ATA devices and ATA devices in the expansion bay are separately
connected to the I/O bus through bidirectional bus buffers.
Trackpad 3
The pointing device in the PowerBook G3 Series computer is a trackpad. The
trackpad is a solid-state device that emulates a mouse by sensing the motions of
the user’s finger over its surface and translating those motions into ADB
commands.
A single button below the trackpad is used to make selections. Alternatively, the
user can tap and double tap on the pad itself. As described in the user’s
manual, the trackpad responds to one or two taps on the pad itself as one or
two clicks of the button. The user can tap and drag on the trackpad in much the
same manner as clicking and dragging with the mouse.
Keyboard 3
The keyboard is removable to allow access to the internal components and
expansion connectors inside the computer. The keyboard is held in place by two
latches located at the top of the keyboard. One latch is between the ESC key and
INTRQ Interrupt request. This active high signal is used to inform the
computer that a data transfer is requested or that a command
has terminated.
/PDIAG Asserted by device 1 to indicate to device 0 that it has
completed the power-on diagnostics; not available on this
computer (n.c.).
/RESET Hardware reset to the drive; an active low signal.
Key This pin is the key for the connector.
Table 3-4 Signals on the ATA hard disk connector (continued)
Signal
name Signal description