SunOS 4.x

SunOS was a UNIX based OS derived from BSD. Initially released in 1982, it was the standard OS on Sun Machines at that time. Platforms supported by this OS were the Motorola 68000, the Sun 386i, and the SPARC. SunOS machines are still actually in use today powering dams and bread factories.

SunOS took a shift starting with version 5.0, which changed its base from BSD to Unix System V Release 4, and became Solaris. The last release under the SunOS name was Version 4.1.4, released in November 1994.

4.0 includes a new virtual memory system, dynamic linking, automounter, System V STREAMS I/O and Sun386i support.

Installation instructions

Note that installing the CD version on real hardware may require a SCSI CD drive that supports 512 byte sectors.

Product type
Sun Microsystems
Release date
End of life date
Minimum CPU
SPARC processors
User interface


Download Name Version Language CPU File type File size
SunOS 4.1.3 (CD) [Sun SPARC] 4.1.3 English SPARC CD 39.34MB
Sun UNIX 4.2 Release 3.5 (Tape) [Sun-2] 4.2 Release 3.5 English m68k Archive 8.1MB
SunOS 4.0 (Tape) [Sun-2] 4.0 English m68k Archive 8.56MB
SunOS 4.0 (Tape) [Sun-3] 4.0 English m68k Archive 9.12MB
SunOS 4.0.1 (3.5) [Sun386] 4.0.1 English x86-32 3½ Floppy 30.27MB
SunOS 4.0.3 (Tape) [Sun-2] 4.0.3 English m68k Archive 6.61MB
SunOS 4.0.3 (Tape) [Sun-3x] 4.0.3 English m68k Archive 9.37MB
SunOS 4.0.3c (3.5-1.44mb) [Sun SPARC] 4.0.3c English SPARC 3½ Floppy 28.1MB
SunOS 4.1.1 (Tape) [Sun-3] 4.1.1 English m68k Archive 55.84MB
SunOS 4.1.1 (Tape) [Sun-3x] 4.1.1 English m68k Archive 59.56MB
SunOS 4.1.1U1 (Upgrade) (Tape) [Sun-3] 4.1.1U1 (Upgrade) Upgrade English m68k Archive 2.08MB
SunOS 4.1.2 (CD) [Sun SPARC] 4.1.2 English SPARC CD 30.47MB
SunOS 4.1.3 Source 4.1.3 English m68k,SPARC 3½ Floppy 15.63MB
SunOS 4.1.4 (CD) [Sun SPARC] (alt) (raw ISO) 4.1.4 English SPARC CD 75.98MB
SunOS 4.1.4 Solaris 1.1.2 Source 4.1.4 English m68k,SPARC Archive 18.06MB


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