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1. The Free On-line Dictionary of Computing (30 December 2018) |
Motorola 68020
68020
MC68020
A microprocessor from Motorola. It was the
successor to the Motorola 68010 and was followed by the
Motorola 68030. The 68020 has 32-bit internal and external
data and address buses and a 256-byte instruction buffer,
arranged as 64 direct-mapped 4-byte entries[?].
The 68020 added many improvements to the 68010 including a
32-bit ALU and external data bus and address bus, and
new instrucitons and addressing modes. The 68020 (and
68030) had a proper three-stage pipeline.
The new instructions included some minor improvements and
extensions to the supervisor state, some support for
high-level languages which didn't get used much (and was
removed from future 680x0 processors[?]), bigger (32 x 32-bit)
multiply and divide instructions, and bit field manipulations.
The new adderessing modes added another level of indirection
to many of the pre-existing modes, and added quite a bit of
flexibility to various indexing modes and operations.
The instruction buffer (an instruction cache) was 256
bytes, arranged as 64 direct-mapped 4-byte entries. Although
small, it made a significant difference in the performance of
many applications.
The 68881 and the faster 68882 FPU chips could be used with
the 68020.
The 68020 was used in many models of the Apple Macintosh II
series of personal computers and Sun 3 workstations.
(2001-03-07)
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Common Misspellings > |
Motorola 68020 oMotorola 68020 oMtorola 68020 MoMtorola 68020 otorola 68020 MMotorola 68020 Mtoorola 68020 Motoorola 68020 Mtorola 68020 Mootorola 68020 Mootrola 68020 Mototrola 68020 Moorola 68020 Mottorola 68020 Motroola 68020 Motoroola 68020 Motrola 68020 Motoorola 68020 Motoorla 68020 Motororla 68020 Motoola 68020 Motorrola 68020 Motorloa 68020 Motoroloa 68020 Motorla 68020 Motoroola 68020 Motoroal 68020 Motorolal 68020 Motoroa 68020 Motorolla 68020 Motorol a68020 Motorola a68020 Motorol 68020 Motorolaa 68020 Motorola6 8020 Motorola 6 8020 Motorola68020 Motorola 68020 Motorola 86020 Motorola 686020 Motorola 8020 Motorola 668020 Motorola 60820 Motorola 680820 Motorola 6020 Motorola 688020 Motorola 68200 Motorola 680200 Motorola 6820 Motorola 680020 Motorola 68002 Motorola 680202 Motorola 6800 Motorola 680220 Motorola 680020 Motorola 6802 Motorola 680200 jotorola 68020 mjotorola 68020 jmotorola 68020 kotorola 68020 mkotorola 68020 kmotorola 68020 lotorola 68020 mlotorola 68020 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