University of Southeastern Philippines

Institute of Computing

OPERATING SYSTEMS

Second Semester – SY 2010-2011

Name: Willy T. Pedroso

Section: BSIT-3

Case Study #: 1

Give an example OS (Specific) for each of the following categories of OS:

· Batch Systems

z/OS is a 64-bit operating system for mainframe computers, produced by IBM. It is the successor to OS/390, which in turn followed a string ofMVS versions^{[NB 1]} and combined a number of formerly separate, related products. z/OS offers the attributes of modern operating systems but also retains much of the functionality originating in the 1960s and each subsequent decade that is still found in daily use. (Extreme backward compatibility is one of z/OS's central design philosophies.) It is derived from OS/390 and was introduced in October, 2000.

z/OS supports staple mainframe technologies such as CICS, IMS, DB2, RACF, SNA, WebSphere MQ, record-oriented data access methods,REXX, CLIST, SMP/E, JCL, TSO/E, and ISPF. However, z/OS also supports 64-bit Java, C/C++, and UNIX (Single UNIX Specification) APIs and applications — The Open Group certifies z/OS as a compliant UNIX operating system — with UNIX/Linux-style hierarchical HFS (not to be confused with the Macintosh HFS) and zFS file systems. As a result, z/OS hosts a broad range of commercial and open source software.^[2]z/OS can communicate directly via TCP/IP, including IPv6, and includes standard HTTP servers (one from Lotus, the other Apache-derived) along with other common services such as FTP, NFS, and CIFS/SMB. Another central design philosophy is support for extremely high quality of service (QoS), even within a single operating system instance, although z/OS has built-in support for Parallel Sysplex clustering.

· Interactive Systems

Sixth Edition Unix, also called Version 6 Unix or just V6, was the first version of the Unix operating system to see wide release outside Bell Labs. It was released in May 1975 and, like its direct predecessor, targeted the DEC PDP-11 family of minicomputers.

Bell Labs developed several variants of V6, including the stripped-down MINI-UNIX for low-end PDP-11 models, LSI-UNIX or LSX for the LSI-11, and the real-time operating systemUNIX/RT, which merged V6 Unix and the earlier MERT hypervisor.

An enhanced V6 was the basis of the first ever commercially sold Unix version, INTERACTIVE's IS/1. Bell's own PWB/UNIX 1.0 was also based on V6, where earlier (unreleased) versions were based on V4 and V5. Whitesmiths produced and marketed a (binary-compatible) V6 clone under the name Idris.

· Real-time systems

RTLinux or RTCore is a hard realtime RTOS microkernel that runs the entire Linux operating system as a fully preemptive process.

It was developed by Victor Yodaiken (Yodaiken 1999), Michael Barabanov (Barabanov 1996), Cort Dougan and others at the New Mexico Institute of Mining and Technology and then as a commercial product at FSMLabs. Wind River Systems acquired FSMLabs embedded technology in February 2007 and now makes a version available as Wind River Real-Time Core for Wind River Linux.

RTLinux was based on a lightweight virtual machine where the Linux "guest" was given a virtualized interrupt controller and timer - and all other hardware access was direct. From the point of view of the real-time "host", the Linux kernel is a thread. Interrupts needed for deterministic processing are processed by the real-time core, while other interrupts are forwarded to Linux, which runs at a lower priority than realtime threads. Linux drivers handle almost all I/O. First-In-First-Out pipes (FIFOs) or shared memory can be used to share data between the operating system and RTCore.

· Hybrid Systems

Windows NT is a family of operating systems produced by Microsoft, the first version of which was released in July 1993. It was a powerful high-level-language-based, processor-independent, multiprocessing, multiuser operating system with features comparable to Unix. It was intended to complement consumer versions of Windows that were based on MS-DOS. NT was the first fully 32-bit version of Windows, whereas its consumer-oriented counterparts, Windows 3.1x and Windows 9x, were 16-bit/32-bit hybrids. Windows 2000, Windows XP, Windows Server 2003, Windows Vista, Windows Home Server, Windows Server 2008 and Windows 7 are based on Windows NT, although they are not branded as Windows NT.

Although various Microsoft publications, including a 1998 question-and-answer session with Bill Gates, reveal that the letters 'NT' were expanded to 'New Technology' for marketing purposes, they originally stood for "N-Ten," the codename of the Intel i860 XR processor for which NT was initially developed. However, they no longer carry any specific meaning.

· Embedded Systems

Windows CE (also known officially as Windows Embedded Compact or Windows Embedded CE post version 6.0 , and sometimes abbreviated Wince) is an operating system developed by Microsoft for minimalistic computers and embedded systems. Windows CE is a distinct operating system and kernel, rather than a trimmed-down version of desktop Windows.^[5] It is not to be confused with Windows XP Embedded which is NT-based.

Microsoft licenses Windows CE to OEMs and device makers. The OEMs and device makers can modify and create their own user interfaces and experiences, while Windows CE provides the technical foundation to do so.

Windows CE is supported on Intel x86 and compatibles, MIPS, ARM, and Hitachi SuperH processors.