SPARCstation 2

Sun Microsystems
Industry	Computer hardware
Founded	February 24, 1982; 44 years ago
Products	SPARCstation series, including SPARCstation 2

The SPARCstation 2 (Sun 4/75, internally known as Calvin) is a SPARC-architecture workstation created and marketed by Sun Microsystems as a member of their SPARCstation series. Introduced on November 5, 1990, its price ranged from US$14,995 to US$49,995. Built upon the sun4c platform, it is powered by a 40-MHz SPARC CPU and maintains the compact pizza-box design of its predecessor, the SPARCstation 1+. The SPARCstation 2 achieved substantial commercial success, with sales surpassing 540,000 units by mid-1992.

Sales

Launched during a period of high demand, Sun Microsystems sold 9,000 units by January 1991. Despite an overall decline in workstation shipments across the industry, it emerged as the top-selling workstation model in 1991. By June 1992, after the release of its successor—the SPARCstation 10—the SPARCstation 2 had contributed significantly to Sun's earnings, representing 40 percent of the company’s revenue in the first quarter of 1992. Industry experts referred to it as "the core of [Sun's] product portfolio."

CPU

Equipped with a 40 MHz Cypress CY7C601 processor delivering 28.5 MIPS and paired with a TI TMS390C601A floating-point unit capable of 4.2 MFLOPS, the SPARCstation 2 offered a single CPU upgrade path: the Weitek 80 MHz SPARC POWER μP known as "power up."

Memory

Memory capacity extends up to 128 MB: consisting of 64 MB directly on the motherboard plus an additional 64 MB via a specialized SBus memory card featuring a piggyback daughterboard. The motherboard includes sixteen RAM sockets compatible with either 1 MB SIMMs (totaling 16 MB) or 4 MB SIMMs (totaling 64 MB). Accepted SIMMs must support parity error detection and have an access time of 80 ns or faster.

Dimensions

The unit measures x x (width by depth by height) and weighs .

Disk drives

Utilizing a conventional 50-pin SCSI interface, the SPARCstation 2 accommodates two full-height, 3½-inch disk drives alongside a unique auto-ejecting floppy drive supporting 1.44 MB disks. While modern 80-pin Single Connector Attachment (SCA) SCSI drives can be installed internally with an adapter, this requires modifications to the drive sled. Additionally, SCA drives tend to produce higher heat output, which may cause thermal challenges when two such drives are mounted simultaneously.

Network

The system’s integrated Ethernet controller is an AMD Lance Am7990 featuring an Ethernet AUI port, with expandability through SBus network cards. External AUI transceivers allow connectivity to diverse Ethernet standards including 10BASE5, 10BASE2, and 10BASE-T. Network booting is supported by the OpenBoot ROM using RARP and TFTP protocols.

NVRAM

An M48T02 chip combining battery-backed real-time clock and RAM handles timekeeping and boot configuration data in the SPARCstation 2. Since its battery is embedded within the chip itself, replacing it requires swapping out the entire component when power is exhausted—resulting in many older machines failing to boot. Moreover, newer revisions of the M48T02 enforce stricter adherence to reserved bit usage than earlier sun4c implementations allowed; this discrepancy can cause RTC errors and prevent successful startup.

Typical repair procedures involve opening the NVRAM casing to replace the internal battery or fully rebuilding the encapsulation along with installing a new clock crystal to restore functionality.

Operating systems

The SPARCstation 2 is compatible with a range of operating systems, including:

SunOS versions starting from 4.1.1 onward
Solaris editions from 2.0 up to Solaris 7 (support for sun4c architecture was discontinued with Solaris 8)
Linux – Certain distributions accommodated this sparc32 variant; notably, Debian provided support beginning with version 2.1 (March 1999) through version 4.0 (etch), with the final update released in May 2010
NetBSD/sparc32 from its initial release, version 1.0
OpenBSD/sparc32 until version 5.9, which marks the last release to offer SPARC32 compatibility