68000 (MC68000, 68K), a 16/32-bit CISC microprocessor designed and marketed by Freescale Semiconductor since 1979, started as a division of Motorola. It was used in Atari ST, Commodore Amiga, and Apple Macintosh personal computers, as well in Sun-1 workstations and many dedicated chess computers. 68000 has an external 16-bit data bus and 24 external address lines to index 16 MByte of physical memory, eight 32-bit general-purpose data registers (D0-D7), and eight address registers (A0-A7). The last address register was also the standard stack pointer, and could be called either A7 or SP [1]. Despite different data- and address registers, 68000 was known for its orthogonal instruction set [2]. Like its 8-bit predecessor 6800, but opposed to x86, 68000 is a Big-endian machine.
Die shot of Motorola 68000 [3]

See also

• 6800
• 68020
• 68030

Publications

• MOTOROLA M68000 FAMILY - Programmer’s Reference Manual (pdf)
• 68000 Assembler - User's Manual (pdf) by Paul McKee

External Links

• Motorola 68000 from Wikipedia
• Motorola 68000 family from Wikipedia
• 68000 Assembly - Wikibooks
• Rookie 1.0 68000 assembly source, search.s from Index of /rookie/nostalgia/v1

References

1. ^ Motorola 68000 from Wikipedia
2. ^ 68000 instructions
3. ^ Die shot of Motorola 68000 microprocessor (MC68000L12) by Pauli Rautakorpi, March 10, 2014, Wikimedia Commons

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