VMS é um sistema de alta perfomance feito pela DEC que corre em máquinas DEC VAX. OpenVMS é uma nova versão do VMS.
“VMS and OpenVMS are the same operating system under two different names (the name changed to OpenVMS about the time POSIX support and a few other “open” items were added.)” — Joshua Cope
“OpenVMS, originally called VMS (Virtual Memory System), was first conceived in 1976 as a new operating system for Digital's new, 32-bit, virtual memory line of computers, eventually named VAX (Virtual Address eXtension). The first VAX model, the 11/780, was code-named “Star”, hence the code name for the VMS operating system, “Starlet”, a name that remains to this day the name for the system library files (STARLET.OLB, etc.). VMS version X0.5 was the first released to customers, in support of the hardware beta test of the VAX-11/780, in 1977. VAX/VMS Version V1.0 shipped in 1978, along with the first revenue-ship 11/780s.”
“OpenVMS was designed entirely within Digital Equipment Corporation. The principal designers were Dave Cutler and Dick Hustvedt. OpenVMS was conceived as a 32-bit, virtual memory successor to Digital’s RSX-11M operating system for the PDP-11. Many of the original designers and programmers of OpenVMS had worked previously on RSX-11M, and many concepts from RSX-11M were carried over to OpenVMS.”
“OpenVMS is a 32-bit, multitasking, multiprocessing virtual memory operating system. Current implementations run on Digital’s VAX and Alpha computer systems.”
Tipo de SO: proprietary
“In the trade press, a Digital employee was once quoted as saying that OpenVMS could now pass the X/OPEN UNIX branding tests. But until it has been certified it can not be called a UNIX.” —John Malmberg
“Unless an operating system has officially passed the X/OPEN UNIX branding, it can not be considered a UNIX. It can only be considered to be UNIX like or compatible. Because UNIX is a registered trademark of X/OPEN, this is a legal issue. In trademark law, the owner of a trademark must prosecute any known generic use of their trademark or they can lose their trademark. I know it seems petty, but that is the way the U.S. legal system works.” —John Malmberg
Data de lançamento:1978
Versão corrente: OpenVMS 7.1
“OpenVMS runs on Alpha and VAX processors” — Joshua Cope
“O-VMS should run on any of the VAXen, including MicroVAX, VAXStation, and VAXServer after the MicroVAX 1.” — Bruce Lane
Número máximo de processadores:
Kernel: proprietary
POSIX: compatible
Periféricos:
Ficheiros de sistema suportáveis:
“OpenVMS with the NAS packages that are bundled with new systems, has full connectivity with TCP/IP protocols. While the NAS package is technically an add-on, at least a base level system is included with all systems sold in the past few years. This provides DECNET IV, DECNET PLUS (OSI PROTOCOL STACK), TCP/IP (FTP, NFS, …) and others. OpenVMS with the NAS packages also supports X-11 and MOTIF. Commercial and freeware packages are available to communicate with SMB protocols.” —John Malmberg
“The file systems natively supported are ODS-1, ODS-2, and ISO-9660. Commercial and freeware programs are available for reading and writing FAT floppy disks.” —John Malmberg
“Underneath the file system OpenVMS supports Record Management Services or RMS. RMS allows programs to support many different file organizations easily and transparently to programs. Other operating systems do not provide this functionality, requiring more work for the programmer, or a small database product to be used.” —John Malmberg
Motor de gráficos:
Operador de interface(texto): DCL
“While the view from the DCL shell is different from UNIX compatible systems, there is much in common between the two operating systems. As such, it would be rare to find a feature in one of the OpenVMS that is not in a UNIX compatible and vicea-versa. The actual name it goes by could be quite different. There are however some that should be taken into consideration.” —John Malmberg
Operador de interface(gráfico): X Window X-11 e Motif
“OpenVMS with the NAS packages (bundled with new systems) also supports X-11 and MOTIF.” —John Malmberg
Internet:
“Most LINUX E-MAIL packages are available for OpenVMS, and the Operating System contains an easy to use E-MAIL system that can be used for both internal and Internet E-MAIL.” —John Malmberg
http://www.openvms.digital.com/
http://www.digital.com/info/SP2501/ “OpenVMS Operating System for Alpha and VAX, Version 7.1”
(Frequently Asked Questions)
http://WWW.OPENVMS.DIGITAL.COM/wizard/openvms_faq.txt
http://www.levitte.org/~ava/vms_faq.htmlx
