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'''[[Main Page|Home]] * [[Hardware]] * 68020'''
[[FILE:Motorola 68020 die.JPG|border|right|thumb|Die shot of [[Motorola]] 68020 <ref>[https://commons.wikimedia.org/wiki/File:Motorola_68020_die.JPG Die shot] of [[Motorola]] 68020 microprocessor (MC68020FE16E) by [https://commons.wikimedia.org/wiki/User:Birdman86 Pauli Rautakorpi], September 26, 2013, [https://en.wikipedia.org/wiki/Wikimedia_Commons Wikimedia Commons]</ref> ]]
The '''68020''' (MC68020) is a 32-bit [https://en.wikipedia.org/wiki/Microprocessor microprocessor] by [[Motorola]], released in 1984 as successor of the [[68000]] and [https://en.wikipedia.org/wiki/Motorola_68010 68010]. Amongst others, it was used in [[Apple]] [[Macintosh|Macintosh II]] [https://en.wikipedia.org/wiki/Personal_computer personal computers], [[Sun#3|Sun-3]] [https://en.wikipedia.org/wiki/Computer_workstation workstations], and advanced [[Dedicated Chess Computers|dedicated chess computers]].
68020 has a 32-bit [[Combinatorial Logic#ALU|ALU]], and like already the 68010 a "loop mode", considered a mini instruction cache. As further improvements, it has [https://en.wikipedia.org/wiki/Motorola_68020#Coprocessor_support Coprocessor-] and [https://en.wikipedia.org/wiki/Motorola_68020#Multiprocessing_features Multiprocessing support], an scaled indexing addressing mode with another level of indirection to many of the pre-existing modes, and some new instructions, 32×32→64 bits multiply and 64÷32→32 bits quotient and 32 bits remainder instructions, and bit field support, including a ''bit field find first one'' instruction (BFFFO), which actually performs an up to 32-bit [[BitScan#LeadingZeroCount|Leading Zero Count]] <ref>[http://www-scm.tees.ac.uk/users/a.clements/BF/BF.htm Bit Field Instructions]</ref>.
=See also=
* [[68000]]
* [[68030]]
=Publications=
* [http://www.freescale.com/files/archives/doc/ref_manual/M68000PRM.pdf MOTOROLA M68000 FAMILY - Programmer’s Reference Manual] (pdf)
* Clara I. Serrano ('''1985'''). ''[http://www.computer.org/portal/web/csdl/doi/10.1109/AFIPS.1985.36 Introducing the MC68020: Performance and flexibility improvement through redesigned hardware and software enhancements]''. Proceedings of the National Computer Conference, [http://www.computer.org/plugins/dl/pdf/proceedings/afips/1985/5092/00/50920233.pdf pdf]
=External Links=
* [https://en.wikipedia.org/wiki/Motorola_68020 Motorola 68020 from Wikipedia]
* [http://www.cpu-collection.de/?tn=1&l0=cl&l1=68020 cpu-collection.de >> by Class >> 68020]
* [https://en.wikipedia.org/wiki/Motorola_68000_family Motorola 68000 family from Wikipedia]
=References=
<references />
'''[[Hardware|Up one Level]]'''
[[FILE:Motorola 68020 die.JPG|border|right|thumb|Die shot of [[Motorola]] 68020 <ref>[https://commons.wikimedia.org/wiki/File:Motorola_68020_die.JPG Die shot] of [[Motorola]] 68020 microprocessor (MC68020FE16E) by [https://commons.wikimedia.org/wiki/User:Birdman86 Pauli Rautakorpi], September 26, 2013, [https://en.wikipedia.org/wiki/Wikimedia_Commons Wikimedia Commons]</ref> ]]
The '''68020''' (MC68020) is a 32-bit [https://en.wikipedia.org/wiki/Microprocessor microprocessor] by [[Motorola]], released in 1984 as successor of the [[68000]] and [https://en.wikipedia.org/wiki/Motorola_68010 68010]. Amongst others, it was used in [[Apple]] [[Macintosh|Macintosh II]] [https://en.wikipedia.org/wiki/Personal_computer personal computers], [[Sun#3|Sun-3]] [https://en.wikipedia.org/wiki/Computer_workstation workstations], and advanced [[Dedicated Chess Computers|dedicated chess computers]].
68020 has a 32-bit [[Combinatorial Logic#ALU|ALU]], and like already the 68010 a "loop mode", considered a mini instruction cache. As further improvements, it has [https://en.wikipedia.org/wiki/Motorola_68020#Coprocessor_support Coprocessor-] and [https://en.wikipedia.org/wiki/Motorola_68020#Multiprocessing_features Multiprocessing support], an scaled indexing addressing mode with another level of indirection to many of the pre-existing modes, and some new instructions, 32×32→64 bits multiply and 64÷32→32 bits quotient and 32 bits remainder instructions, and bit field support, including a ''bit field find first one'' instruction (BFFFO), which actually performs an up to 32-bit [[BitScan#LeadingZeroCount|Leading Zero Count]] <ref>[http://www-scm.tees.ac.uk/users/a.clements/BF/BF.htm Bit Field Instructions]</ref>.
=See also=
* [[68000]]
* [[68030]]
=Publications=
* [http://www.freescale.com/files/archives/doc/ref_manual/M68000PRM.pdf MOTOROLA M68000 FAMILY - Programmer’s Reference Manual] (pdf)
* Clara I. Serrano ('''1985'''). ''[http://www.computer.org/portal/web/csdl/doi/10.1109/AFIPS.1985.36 Introducing the MC68020: Performance and flexibility improvement through redesigned hardware and software enhancements]''. Proceedings of the National Computer Conference, [http://www.computer.org/plugins/dl/pdf/proceedings/afips/1985/5092/00/50920233.pdf pdf]
=External Links=
* [https://en.wikipedia.org/wiki/Motorola_68020 Motorola 68020 from Wikipedia]
* [http://www.cpu-collection.de/?tn=1&l0=cl&l1=68020 cpu-collection.de >> by Class >> 68020]
* [https://en.wikipedia.org/wiki/Motorola_68000_family Motorola 68000 family from Wikipedia]
=References=
<references />
'''[[Hardware|Up one Level]]'''
