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Motorola 68000

Motorola 68000. by Matt Bachiochi, Will Lowrey, Matt Petrick, Scott Schenkein, and Mark Wade. Registers. About Status Bits Distribution. Registers: About. General purpose register-based machine Every data register can be used as an accumulator or a temp register

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Motorola 68000

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  1. Motorola 68000 by Matt Bachiochi, Will Lowrey, Matt Petrick, Scott Schenkein, and Mark Wade

  2. Registers • About • Status Bits • Distribution

  3. Registers: About • General purpose register-based machine • Every data register can be used as an accumulator or a temp register • Data bytes are arranged with least-significant byte at the higher address • This is known as the endian approach

  4. Registers: Status Bits • The M68000 has 10 status bits • T: Trace bit 15 • S: Supervisor Mode bit 13 • I2: Interrupt Mask 2 bit 10 • I1: Interrupt Mask 1 bit 9 • I0: Interrupt Mask 0 bit 8 • X: Sign Extend bit 4 • N: Negative bit 3 • Z: Zero bit 2 • V: Overflow bit 1 • C: Carry bit 0

  5. Registers: Distribution • Total number of registers is 19 • 8 are general data • 7 are general address • 2 are stack pointers • 1 processor status word • 1 program counter

  6. Addressing Modes • The Motorola 68000 has 14 different addressing modes • Register Direct • Address Register Indirect • Absolute Data Register • Program Counter Relative • Immediate Data • Implied Addressing

  7. Technology • The 68000 was originally a 5 volt NMOS dynamic construction • Later updated to a CMOS • CMOS-TTL bridged busses • Bus Arbitration Control circuitry

  8. Motorola 68000 Is a CISC! With only one data pipe.

  9. Speed • Clock speed: 8 - 16 Mhz • Dhrystones: • Raw processing benchmarks integer data • 2100 - 4376 • MIPS: • Millions of instructions per second • 1.2 - 2.5

  10. The Motorola 68000 Processor Historical Computers

  11. The Apple LISA (1983) • The Precursor to the Macintosh • Local Integrated Software Architecture • 1 Meg Ram, 10 Meg HDD • Cost: $10,000

  12. The Apple Macintosh (1984) • Known as the “Mac-in-the-box” • First to use MacOS • Had 128K RAM • No hard drive • Cost: $2500 • Market for Radiation Underwear

  13. The Commodore Amiga (1985) • The fastest commercial M68000 • Had 512K RAM • Capable of Color • Cost: $2,800

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