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General| Release Year | 1983 |
|---|---|
| Release Date | January 19, 1983 |
| Processor | Motorola 68000 |
| CPU Speed | 5 MHz |
| RAM | 1 MB |
| Operating System | Lisa OS |
| Storage | 5 MB ProFile hard drive |
| Display | 12-inch monochrome |
| Ports | one parallel port |
| Weight | 48 lbs (21.8 kg) |
| Dimensions | 15.2 x 18.7 x 13.8 inches |
Details the Motorola MC68000 microprocessor, its clock speed, and memory cycle time.
Describes the bit-mapped display resolution and refresh mechanism.
Explains the memory management unit, address spaces, and RAM capacity.
Covers the system bus connections, cycle, and timing.
Details the 16-bit microprocessor, its registers, and addressing capabilities.
Explains the interrupt handling structure, vector table, and priority levels.
Details RAM chip configurations and board capacities.
Explains MMU function in address translation, access controls, and segmentation.
Describes the Segment Origin Register (SORG) for physical address calculation.
Explains context bits for switching MMU register sets.
Details the Segment Limit Register for address space checks and access control.
Explains how the 68000 uses the stack pointer and segment growth.
Describes the procedure for initializing MMU registers via the SETUP bit.
Explains detection of hard and soft memory errors and their disabling.
Details bits for reading system bus status, errors, and video signals.
Describes the latch that stores the address of memory errors.
Explains flip-flops for testing error detection and correction circuitry.
Covers display dimensions, dot clock, line frequency, and aspect ratios.
Explains controlling CRT display contrast via a digital-to-analog converter.
Illustrates timing diagrams for system bus read/write cycles.
Shows timing diagrams for video and CPU cycles on the memory bus.
Lists I/O devices on the board: keyboard, serial, disk, speaker.
Describes the COPS microprocessors used for keyboard communication.
Details keyboard connection, scanning, N-key rollover, and FIFO buffer.
Explains the format and meaning of keycode bytes.
Describes the mouse as an input device and its connector pinout.
Explains the command format for mouse interrupt configuration.
Details the three-byte data format for mouse movement and button status.
Explains the clock/calendar function, alarm capabilities, and communication.
Describes the CVSD circuit for audio conversion and volume control.
Details the two built-in RS232-C serial ports and NEC 7201 interface.
Explains standard and 6522-controlled baud rates for serial communication.
Describes the 6505 microcomputer-based disk controller.
Lists commands for the floppy disk controller, including RWTS.
Explains the command for executing Read/Write/Track/Sector routines.
Details data storage format, block size, and disk capacity.
Describes the 1K RAM backed by battery for parameter storage.
Explains the battery backup charging control and duration.
Describes the basic operation of bus interface signals for expansion cards.
Details protocols for I/O card identification and boot ROM.
Explains the DMA scheme, prioritization, and controller simulation.
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