Apple PowerBook 520 Technical Information Page 88

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CHAPTER 5
Software
74 ROM Software
PDS Support Software 5
As in the desktop Macintosh models, the PDS expansion card is treated like a NuBus
expansion slot. The Slot Manager software looks for a configuration ROM on the PDS
card and then treats the card like a NuBus expansion card. PDS cards with configuration
ROM that conforms to the requirements described in Designing Cards and Drivers for the
Macintosh Family, third edition, will work with the existing Slot Manager. The Slot
Manager used with the PowerBook 520 and 540 computers is the same as that used in
previous PowerBook models.
The interrrupt from the PDS slot maps to an interrupt from expansion slot $A.
Support for Function Keys 5
The keyboards on the PowerBook 520 and 540 computers have a row of 12 function keys
across the top. Except for the function keys, the keyboards are similar to those on
previous PowerBook models. The function keys are added to the key matrix in the
same way as the function keys on the Apple Extended Keyboard and return the same
key codes.
Intelligent Battery Support 5
The Power Manager IC communicates with the processors in the PowerBook Intelligent
Batteries by means of a serial interface. The Power Manager’s command set has been
expanded to provide system access to the data from the batteries.
Trackpad Software 5
The trackpad hardware, the Power Manager IC, and the system software work together
to translate the movements of a finger across the surface of the trackpad into cursor
movements.
The control registers for the trackpad hardware are part of the Power Manager IC. The
Power Manager’s software takes the raw data from the trackpad hardware and converts
it to the same format as ADB mouse data before sending it on to the system software.
The ADB software that supports the trackpad includes the Cursor Device Manager,
which provides a standard interface for a variety of devices. The ADB software checks
to see whether a device connected to the ADB port is able to use the Cursor Device
Manager. For more information, see the January 1994 revision of Technical Note HW 01,
ADB—The Untold Story: Space Aliens Ate My Mouse.
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