Motorola introduced its first 8-bit microprocessor 6800 in 1974.It was widely used in industry for controlling equipment in 1970s. It was followed by an advanced 8-bit microprocessor 6809.The 6809 is faster and more powerful than 6800.
In 1979,Motorola introduced an advanced powerful 16-bit microprocessor 68000.Though its data bus is 16-bit wide its internal architecture is of 32 bits.It can directly address upto 16 MB memory.it is a hybrid computer between 16-bit and 32-bit architecture.It was very popular and widely used.
Motorola introduced 68008 microprocessor in 1982.It is similar to 68000 but it has only 8-bit data bus so that it can use 8-bit I/O devices.The was developed to build computers using 8-bit I/O devices.It was not widely used.
In 1983,Motorola introduced 68010 microprocessor an improved version of 68000.The 68010 contained hardware features to support virtual memory.Its direct memory addressing capacity is 16MB.Again in 1983 Motorola developed 68012 similar to 68010 but its memory addressing capacity is more,i.e 2 GB.
In 1984,Motorola introduced 68020,an advanced 32-bit microprocessor.Its data bus is 32-bit wide.Its direct memory addressing capacity is 4 GB.It has onchip instruction cache.It was widely used in microcomputers.
In 1989,Motorola introduced 68040,an advanced microprocessor.It contains a CPU,MMU,floating-point corprocessor and cache memory.It contains a circuitry of 1.2 million transistors.The 68040 was suitable to be the CPU of a minicomputer.
Motorola 680X0 series of Microprocessors were similar from programmer's point of view.An improved new machine of this series can run the software of its predecessor of the series.Microprocessors of this series were used to build minicomputers.
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