Technology
UNIX® SVR4, Symmetric Multiprocessor (SMP) multithreaded, with fine-grained kernel locking
Product Span
Single OS for all R3000 and R4000 based systems, desktop to datacenter
Suggested Memory
24MB or greater
File Systems
VFS (vnode) interface, EFS for 8GB file systems, XFS(tm)  File System support for 1TB file systems, NFS , lv for striping, FAT (MSDOS) and HFS (Macintosh®) support on removable devices; CD support for ISO9660 and Rockridge format
Loadable Device Drivers
SVR4.0 MP DDI/DKI, loadable drivers
Terminal Support
STREAMS, international support
IPC
SVR4 messages, semaphores, shared memory, FIFOs; BSD sockets
Real-Time Support
Preemptible kernel, non-degrading priorities, memory lockdown, high-resolution timers, multithreaded application support, queued signals, deadline scheduling
User MP Facilities
Lightweight process parallelism, memory-based synchronization, processor affinity, parallelizing compilers (C and Fortran) 
Distributed Computing
ONC 4.1  (NFS, NIS, RPC, automount, lockd, etc.) ONC+ (NFS version 3 protocol, Caching File System (CFS))

Networking
Sockets TCP/IP stack, TLI, DLPI driver interface; Ethernet, SLIP, PPP, HiPPI , FDDI  interfaces supported
Network Management
SNMP with MIB II. NetVisualyzer(tm) , Cabletron SPECTRUM(tm) Network Management System 
Connectivity Products
SNA(tm) (3270, LU6.2) , DECnet(tm) , LAT , OSI Transport 
System Administration
Visual system administration toolchest, graphic system monitor IRIXpro(tm)  system administration tools, Performance Copilot(tm)  performance management tools
Security
Auditing, shadow passwords, password aging, expanded login options, B1 version available 
Backup/Restore
Dump/restore, bru, cpio, tar; IRIS NetWorker(tm) for IRIX 
Printing Support
Lpd, lpsched, IRIS Impressario(tm) printer management system 
Internationalization
XPG3-compliant message catalogs locale support for currency, date, etc., wide character support, country kits 
Graphics Support
OpenGL®, X11R5, X11R6, PEX, IRIX(tm) IM(tm), Display PostScript(tm)
Software Development
Developer Magic(tm) ProDev , ANSI C , C++ , Fortran 77 , Pascal , ADA 
Usability Features
Indigo Magic(tm) user environment, Showcase(tm) presentation authoring tool, IRIS Explorer(tm) visualization framework, IRIS Inventor(tm), IRIS InSight(tm) SGML document reader and on-line documents, 4Dgifts  : extensive demos and sample code  


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