The major vendors in the market right now are IBM (itself has 90% market share), Groupe Bull, Unisys, HP and Oracle (Sun Microsystems).
I think it should be Linux. Linux is famous for running effectively on powerful computers. It is very customizable and does not crash easily on constant use.
Actually, UNIX is an operating system. It is generally used in business applications on large mainframe computers. However, many hobbyists prefer it for its simplicity and scalability.
The MVS operating system was the most commonly used operating system used on mainframe computers. The MVS operating system was developed by IBM and was first released in 1974.
The basic difference is that @ mainframe platform u can run more than one OS at a time on same machine but this feature not available at PC OS. Mainframe OS are targeted to handle hundreds of users at a time whereas PC OS is targeted for a single user. The only major difference is that a mainframe operating system will probably need to service many users at the same time, whereas a PC operating system normally only has to worry about one user at a time. There are some differences between personal computer OS and mainframe OS, one of them a mainframe OS can be used by many users at the same time so it must need to service for many users. However a personal computer operating system designed for one user normally.second of them a mainframe OS is more powerful and expensive than PC OS. Mainframe OS designed to huge process from many users and it means, it manages lots of I/O for many users, but in PC OS there is just one user to log in it means, it does not manages lots of I/O for one user. Mainframe OS offers three kinds of service batch, transaction processing and timesharing. Personal computer OS used for some basic processing like word processing, spreadsheets and Internet access that PC OS is supports multiprogramming.
The pourpose: the mainframe is for processing large amounts of data, PC is for satisfy a human's various needs, like DVD-playing, word-processing, web-browsing.
SunMicro Systems and IBM
There are many different vendors for the 2 most common types of computers. Dell and Apple are 2 majors vendors.
Micro, Mini, Mainframe, and Super.
IBM and Cray Inc.
Computers, Which are technically superior to mainframe are called super computers.
short history of mainframe
what is memorey capacity of the mainframe computers
Mainframe computers first used star topology
Mainframe computers are high-speed, multi-purpose machines that cost millions.
Today supercomputers are the fastest computers available and are used by military and defense research agencies, universities, independent research centers and some engineering corporations. Major vendors of these computers include IBM and HP.
IBM
IBM system 3 and AS-400 are some examples of minicomputers.