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Title: Sun-2  
Author: World Heritage Encyclopedia
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Subject: Sun Microsystems, Sun-3, SunOS, GEC Computers, Sun386i
Collection: 68K Microprocessors, Diskless Workstations, Sun Servers, Sun Workstations
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Sun 2/120 server with SMD disk tower

The Sun-2 series of UNIX workstations and servers was launched by Sun Microsystems in November 1983.[1] As the name suggests, the Sun-2 represented the second generation of Sun systems, superseding the original Sun-1 series. The Sun-2 series used a 10 MHz Motorola 68010 microprocessor with a proprietary Sun-2 Memory Management Unit (MMU), which enabled it to be the first Sun architecture to run a full virtual memory UNIX implementation, SunOS 1.0, based on 4.1BSD. Early Sun-2 models were based on the Intel Multibus architecture, with later models using VMEbus, which continued to be used in the successor Sun-3 and Sun-4 families.

Sun-2 systems were supported in SunOS until version 4.0.3.

A port to support Multibus Sun-2 systems in NetBSD was begun in January 2001 from the Sun-3 support in the NetBSD 1.5 release. Code supporting the Sun-2 began to be merged into the NetBSD tree in April 2001.[2] sun2 is considered a tier 2 support platform as of NetBSD 6.1.5.[3]


  • Sun-2 models 1
  • Sun-2 hardware 2
    • Sun 2 Multibus systems 2.1
    • Sun 2 VMEbus systems 2.2
  • See also 3
  • Sun timeline 4
  • References 5
  • External links 6

Sun-2 models

Sun 2/50 diskless workstation

Models are listed in approximately chronological order.

Model CPU board Display Max. RAM Chassis
2/120 Sun-2 Multibus or Sun-2 Multibus Prime Monochrome 8 MB 9-slot Multibus (deskside)
2/170 Sun-2 Multibus or Sun-2 Multibus Prime Optional 8 MB 15-slot Multibus (rackmount)
2/50 Sun 2050 VME Monochrome 8 MB 2-slot VME (desktop)
2/130 Sun 2050 VME Monochrome 8 MB 12-slot VME (deskside)
2/160 Sun 2050 VME Color 8 MB 12-slot VME (deskside)

A desktop disk and tape sub-system was introduced for the Sun-2/50 desktop workstation. It could hold a 5 ¼" disk drive and 5 ¼" tape drive. It used DD-50 (sometimes erroneously referred to as DB-50) connectors for its SCSI cables, a Sun specific design. It was often referred to as a "Sun Shoebox".

Sun-2 Disk and Tape Sub-System
Sun-2 Disk and Tape Sub-System (front) 
Sun-2 Disk and Tape Sub-System (rear) 

Sun-1 systems upgraded with Sun-2 Multibus CPU boards were sometimes referred to as the 2/100U (upgraded Sun-100) or 2/150U (upgraded Sun-150).

A typical configuration of a monochrome 2/120 with 4 Mb of memory, 71 Mb SCSI disk and 20 Mb 1/4" SCSI tape cost $29,300 (1986 US price list[4]).

A color 2/160 with 8Mb of memory, two 71 Mb SCSI disks and 60 Mb 1/4" SCSI tape cost $48,800 (1986 US price list).

A Sun 2/170 server with 4Mb of memory, no display, two Fujitu Eagle 380 Mb disk drive, one Xylogics 450 SMD disk controller, a 6250 bpi 1/2 inch tape drive and a 72" rack cost $79,500 (1986 US price list).

Sun-2 hardware

Sun-2 Multibus Prime CPU

Sun 2 Multibus systems

Sun 2/120 (9 slot deskside) and 2/170 (15 slot rackmount) systems were based on the Multibus architecture. The CPU board was based on a 10 MHz 68010 processor with a proprietary Sun Memory Management Unit (MMU) and could address 8 MB of physical and 16MB of virtual memory. The top 1 MB of physical memory address space was reserved for the monochrome frame buffer. The Multibus CPU board supported the Sun-1 parallel keyboard and mouse as well as two serial ports.

Sun-2 Multibus circuit boards
Sun-2 Multibus CPU board 
Sun-2 Multibus 1 Mb Memory board 
Sun-2 Multibus Ethernet board 
Sun-1 Multibus color graphics board 
3Com Multibus Ethernet board 
Xylogics Multibus SMD disk controller board 
Helios Multibus 4 Mb memory board 

Sun 2 VMEbus systems

The Sun 2/50 (2 slot desktop), Sun 2/130 (12 slot monochrome deskside) and Sun 2/160 (12 slot color deskside) used quad-depth, triple height Eurocard VMEbus CPU boards. The VMEbus CPU board was based on the same design as the Multibus CPU but also included 2Mb or 4Mb of memory, the Sun-2 monochrome frame buffer, and 10 Mbit/s Thick Ethernet on board.

Sun provided 1 Mb Multibus memory boards and 1 MB and 4 MB VMEbus memory boards but only supported configurations with a maximum of 4 MB RAM. Companies such as Helios Systems also made 4 MB memory boards that would work in Sun systems.

A common frame buffer was the Sun-2 Prime Monochrome Video. This board provided an 1152x900 monochrome display with TTL or ECL video signals, and keyboard and mouse ports. It normally occupied the top 1 MB of physical memory address space. There was also a Sun-2 Color Video board available that provided an 1152x900 8-bit color display. This board occupied the top 4 MB of address space.

42MB MFM disks were commonly used for storage. Two disks could be connected to an Adaptec MFM/SCSI and then to a Sun-2 Multibus Serial/SCSI Host Adapter. The SCSI board provided two additional serial ports. For larger storage requirements, 65, 130, and 380 MB SMD disks were connected to a Xylogics 450 SMD Controller. The SMD controller could support four disks even though Sun only supported two. A 20 MB QIC tape drive could be connected through an Archive QIC/SCSI converter. The system also supported 1/2" tape drives connected to a Computer Products Corporation TAPEMASTER or a Xylogics 472 board.

An Ethernet connection was provided by a Sun board based on the Intel 82586 chip, or a 3Com 3c400 board. The server could support diskless Sun-2/50 clients through the Ethernet board.

Other supported Multibus boards included the Sky Computer Floating Point Processor, Sun ALM (Asynchronous Line Multiplexer) with 8 serial ports, and Sun SunLink Communications Processor (SCP) for SNA and X.25 connectivity.

Sun-2 VME circuit boards
Sun-2 VME CPU board 
Sun-2 VME 1 Mb Memory and SCSI board 

See also

Sun timeline


  1. ^ "Articles from the Past 25 Years". November 7, 1983. Archived from the original on 2009-08-13. Retrieved March 11, 2014. 
  2. ^ "NetBSD/sun2: Frequently Asked Questions". January 1, 2013. Archived from the original on March 11, 2014. Retrieved March 11, 2014. 
  3. ^
  4. ^ Sun U.S. Price List, End User and OEM Version, Effective March 25, 1986, Sun Microsystems

External links

  • Sun Microsystems
  • The Sun Hardware Reference, Part 1
  • The Sun-2 Hardware Reference: Part 1 and Part 2
  • Sun Field Engineer Handbook, 20th edition
  • Sun-2 Archive
  • Sun2 Review from UNIX/WORLD October 1984
  • Sun 100u with Sun2 boards
  • Sun 2 board manuals
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