68020


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 * [[image:246px-Motorola_68020_die.JPG link="https://commons.wikimedia.org/wiki/File:Motorola_68020_die.JPG"]] ||~ || The **68020** (MC68020) is a 32-bit [|microprocessor] by Motorola, released in 1984 as successor of the 68000 and [|68010]. Amongst others, it was used in Apple Macintosh II [|personal computers], Sun-3 [|workstations], and advanced dedicated chess computers.

68020 has a 32-bit ALU, and like already the 68010 a "loop mode", considered a mini instruction cache. As further improvements, it has [|Coprocessor-] and [|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 Leading Zero Count. || =See also=
 * Die shot of Motorola 68020 ||~ ||^ ||
 * 68000
 * 68030

=Publications=
 * [|MOTOROLA M68000 FAMILY - Programmer’s Reference Manual] (pdf)
 * Clara I. Serrano (**1985**). //[|Introducing the MC68020: Performance and flexibility improvement through redesigned hardware and software enhancements]//. Proceedings of the National Computer Conference, [|pdf]

=External Links=
 * [|Motorola 68020 from Wikipedia]
 * [|cpu-collection.de >> by Class >> 68020]
 * [|Motorola 68000 family from Wikipedia]

=References= =What links here?= include component="backlinks" page="68020" limit="100"
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