Motorola 68020

The Motorola 68020 is a 32-bit microprocessor monolithic integrated circuit based on the Motorola 68000 architecture, introduced in 1984.

Unlike the earlier 68000-family CPUs, the 68020 has 32-bit internal and external data and address buses and a 32-bit ALU. It was produced with clock speed ratings from 12 MHz to 33 MHz.

Compared to the predecessors, the 68020 adds extra instructions and additional addressing modes, pipelining, a 256-byte direct-mapped instruction cache, and support for non-aligned memory accesses. It also features an asynchronous coprocessor interface supporting up to eight coprocessors, such as floating point units (MC68881 or MC68882) or a paged memory management unit (MC68851).

The lower-cost 68EC020 version has a 24-bit external address bus.

Links

• Motorola 68020 @ Wikipedia

Used in

Some instruments using part Motorola 68020

Instrument	Manufacturer	Class	Model	Description	Introduced
4224	Tektronix	Terminal	4224	16" or 19" Color graphics terminal	1988
4225	Tektronix	Terminal	4225	16" or 19" Color graphics terminal	1988
4325	Tektronix	Terminal	4325	16" or 19" Color graphics workstation	1988

Supported by

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Pictures

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  MC68020RC16B

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  MC68020RC16B

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  MC68020RC20E

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  MC68020RC20E