DEC 600s Owner's Manual page 26

Operating Systems
The DEC OSF/1 AXP operating system is Digital Equipment
DEC OSF/1
AXP Operating Corporation's implementation of the Open Software Foundation
(OSF) operating system components and Motif graphical user
System
interface and programming environment.
Description DEC OSF/1 AXP is compliant with the OSF Application
of DEC OSF/1 Environment Specification (AES), which specifies the interface
AXP to support portable applications designed to run on a variety of
hardware platforms.
In addition, the DEC OSF/1 operating system complies with the
following standards and industry specifications:
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The DEC OSF/1 AXP operating system is an advanced kernel
DEC OSF/1 AXP
architecture based on Carnegie Mellon University's Mach
Architecture
V2.5 kernel design with components from Berkeley Software
Distribution 4.3 (BSD) and other sources. DEC OSF/1 AXP
provides numerous features to assist application programmers
in developing applications that use shared libraries, multithread
support, and memory mapped files.
To ensure a high level of binary compatibility with the ULTRIX
operating system, the DEC OSF/1 AXP operating system is
compatible with the Berkeley 4.3 programming interfaces.
1–6 Introduction to Your System
FIPS 151-1
POSIX (IEEE Std. 1003.1-1988)
XPG3 BASE branding
XTI
AT&T System V Interface Definition (SVID) Issue 2 (Base
System and Kernel Extensions)