C H A P T E R 1
Introduction to the PowerBook Duo 250 Computer
The Macintosh PowerBook Duo 250 computer is a member of the PowerBook Duo family of computers. It has all the basic features of the PowerBook Duo computer but also has certain new features which are described in this note. These features include
■an
■a 200 MB hard drive
■an inverter/speaker board that is compatible with both film
The computer uses the same 33 MHz 68030 microprocessor as the PowerBook Duo 230 computer. Chapter 2, “Hardware Modifications,” describes the modifications made to the original PowerBook Duo computer to implement the PowerBook Duo 250 computer. Chapter 3 describes the software modifications.
This note is a supplement to the Macintosh Duo System Developer Note, R0457LL/A, which contains detailed information about the basic Macintosh PowerBook Duo computer.
PowerBook Duo 250 Computer Features
Features of the PowerBook Duo 250 computer are listed below. Items in boldface type are unique to the PowerBook Duo 250 computer, and are described in more detail
later in this note. All other items are discussed in detail in the Macintosh Duo System Developer Note.
■main processor: 33 MHz 68030 microprocessor
■main system controller (MSC): controls DRAM, ROM,
■Power Manager: a custom microcontroller that provides intelligent power management
■integral hard disk: 120 MB or 200 MB capacity
■4 MB of DRAM on the main logic board
■DRAM connector: accommodates 4 MB or 8 MB Apple DRAM expansion card, expanding system DRAM capacity to 8 MB or 12 MB;
■1 MB of ROM: stores system and configuration data.
■
■video components: a
■inverter/speaker board compatible with both FSTN and AM displays
■Combo chip: includes the Serial Communication Controller (SCC) and Small Computer System Interface (SCSI) controller
2PowerBook Duo 250 Computer Features
