Motorola 68030
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| Motorola 68030 | |
|---|---|
 | |
| Name | Motorola 68030 |
| Produced | 1987–1995 |
| Designer | Motorola |
| Arch | 32-bit CISC |
| Clock | 16–50 MHz |
| Predecessor | Motorola 68020 |
| Successor | Motorola 68040 |
Motorola 68030 is a 32-bit microprocessor designed by Motorola as part of the Motorola 68000 series family. Released in 1987, it served as a widely used central processing unit in workstations, personal computers, embedded systems, and game consoles during the late 1980s and early 1990s. The 68030 combined features from earlier Motorola 68020 and Motorola 68000 designs while adding on-chip caches and a paged memory management unit, making it popular in platforms from Apple Computer to Commodore International and industrial vendors.
Overview
The 68030 followed the Motorola 68020 and provided integrated enhancements sought by designers at Sun Microsystems, NeXT, and Atari Corporation. It maintained compatibility with software targeting the Motorola 68000 instruction set while supporting 32-bit addressing used by operating systems like UNIX System V, BSD, and proprietary kernels from Apple Computer for the Macintosh line. The chip’s introduction influenced designs by companies such as IBM, Texas Instruments, and Sequent Computer Systems that leveraged the 68030 for multiprocessing and embedded control.
Architecture and Features
Architecturally, the 68030 implemented the full 32-bit register set established by the Motorola 68020 and featured an on-chip paged Memory Management Unit (MMU) similar in concept to units used in systems from Sun Microsystems and DEC. It integrated separate instruction and data caches—on-chip, virtually indexed—reducing latency relative to external cache schemes used by contemporaries like Intel 80386. The 68030 supported the MC68881 and MC68882 floating-point coprocessors for floating-point operations favored in workstation applications by Silicon Graphics and Hewlett-Packard. Its bus interface matched system designs from vendors such as Commodore Amiga and Atari ST, simplifying system-level integration with controllers from Western Digital and SCSI vendors.
Performance and Implementations
Benchmarked against competitors like the Intel 80386DX and the Motorola 68020, the 68030 delivered improved throughput due to on-chip caches and tighter microarchitectural timing used in designs by NeXT and Sun Microsystems. Systems running operating systems including NeXTSTEP, AmigaOS, Mac OS, and various BSD distributions exploited the 68030’s features for multitasking and virtual memory. In multiprocessing installations by Sequent Computer Systems and specialized servers from Data General, the 68030 was used in tightly coupled configurations and real-time controls in products from Siemens and General Electric.
Variants and Packaging
Motorola produced several speed-graded variants ranging from 16 MHz to 50 MHz fabricated in CMOS processes similar to those used by Intel and IBM fabs of the era. Packaging options included PLCC and PQFP formats compatible with motherboards from Apple Computer and third-party manufacturers like Asus and Gateway 2000. Industrial and embedded derivatives saw extended temperature ranges adopted by companies such as Honeywell and Rockwell International, while licensees and second-source manufacturers included firms in Japan and Europe comparable to Fujitsu and Philips in foundry roles.
Uses and Systems Incorporating the 68030
The 68030 was incorporated into a wide array of products: Apple Macintosh IIci and Macintosh Quadra series machines, NeXT Computer workstations, Commodore Amiga 3000, Atari Falcon, and arcade systems from Konami and Capcom. Workstation vendors such as Sun Microsystems used the 68030 in entry-level systems, while telecommunications and industrial control platforms from Siemens and Ericsson employed it for protocol handling. Educational and research labs running BSD variants and Unix System V on hardware from Packard Bell and boutique builders also utilized the 68030. Its longevity extended into aerospace and defense embedded applications where vendors like BAE Systems and Northrop Grumman applied radiation-hardened or ruggedized implementations.