Processor CPU Motorola 68HC000, 16-bit CMOS microprocessor 15.6672 MHz Addressing 32-bit internal registers 24-bit address bus 16-bit data bus Memory RAM 2 MB of 100 ns pseudostatic RAM (PSRAM) standard, expandable to 8 MB ROM 256K (two 128K by 8-bit devices); 150 ns access time; addressing supports up to 4 MB PRAM 128 bytes of parameter memory VRAM 32K of pseudostatic video display memory Clock/Calendar CMOS custom chip with long-life lithium battery Disk Storage Floppy Drive (Optional) External Macintosh HDI-20 1.4 MB drive 4.5 W startup power; 1.25 W random operation; 50 mW idle 20 MB Hard Drive 20 MB formatted capacity

Apple SCSI interface; 2.5 in. mechanism 23 msec average access time (maximum) 5.0 W startup power; 2.7 W random operation 40 MB Hard Drive 40 MB formatted capacity Apple SCSI interface; 2.5 in. mechanism <19 msec average access time (maximum) 5.0 W startup power; 2.25 2.5 W random operation; 1.3 1.5 W idle I/O Interfaces Floppy Drive One HDI-20 floppy drive port for external 1.4 MB drive SCSI One HDI-30 SCSI port; 1.5 MB/sec. transfer rate Supports five devices maximum Apple Desktop Bus One Apple Desktop Bus (ADB) port; low-speed serial interface Serial Two RS-422 ports, one external and one internal 230.4 Kbaud minimum Asynchronous, synchronous, and AppleTalk protocols supported Internal connector supports Macintosh PowerBook Fax/Data modem Sound and Video Sound Apple Sound Chip; one- or four-voice mono (one or two voices in stereo) with 4-bit digital-to-analog conversion using 22-kHz sampling rate Video Display 9 in. (229 mm) diagonal screen Film-compensated Super Twist Nematic (FSTN), backlit flat-panel display 640 by 400 pixels; 75 dpi

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