Overview
Sun-3 is a family of Unix workstations and servers produced by Sun Microsystems beginning in 1985. The series was based on the Motorola 68020 microprocessor (and later the 68030) and was part of Sun’s early product line that preceded the SPARC-based Sun-4 architecture.
History
- Introduction (1985): Sun Microsystems released the first Sun-3 models as successors to its earlier Sun-2 line, aiming to provide higher performance Unix platforms for scientific, engineering, and commercial applications.
- Development: The Sun-3 series incorporated the Motorola 68020 CPU, a 16‑ or 32‑bit address bus, and a VMEbus or proprietary backplane for expansion. Subsequent models adopted the 68030 CPU and added features such as floating‑point units and larger memory capacities.
- Transition: By the early 1990s, Sun began shifting to its Sun-4 architecture built around the SPARC processor. Production of Sun-3 hardware tapered off, with most models discontinued by 1995.
Hardware
- CPU: Motorola 68020 (early models) or 68030 (later models).
- Memory: Configurable from a few megabytes up to 128 MB, depending on the model and expansion slots.
- Storage: Integrated SCSI interfaces for hard disks and tape drives; optional floppy drives.
- Display: Graphics options included Sun’s own monochrome and color frame buffers (e.g., the Sun-3/160’s 8‑bit color board).
- Form factors: Ranged from desktop “workstation” units (e.g., Sun‑3/50, Sun‑3/60) to rack‑mountable servers (e.g., Sun‑3/260, Sun‑3/280).
Operating System
All Sun-3 models ran SunOS, Sun Microsystems’ Unix operating system derived from BSD Unix. Early SunOS releases (e.g., SunOS 3.x) were tailored to the 68k architecture, providing networking (TCP/IP), the X Window System, and a suite of development tools. Later SunOS versions added support for System V features while maintaining BSD compatibility.
Legacy
- Software Compatibility: The Sun-3 architecture supported a broad range of Unix software, which facilitated its adoption in research labs and universities during the late 1980s.
- Transition to SPARC: Experience gained from the Sun-3 series informed Sun’s design of the subsequent Sun-4/SPARC line, which eventually dominated the workstation market.
- Historical Significance: The Sun-3 computers are cited in historical accounts of early Unix workstations and are preserved in several computer museums and archival collections.
References
- Sun Microsystems product catalogs (mid‑1980s to early‑1990s).
- Technical manuals for Sun‑3/160, Sun‑3/260, and related models.
- “The History of Unix” (IEEE Annals of the History of Computing, 1998).
All information presented reflects established historical and technical records regarding the Sun-3 computer series.
