IBM
IBM produced their first mainframe computer in 1952. Between 1952 and the late 1970's the term "mainframe computer" was automatically linked with IBM because they had the largest share of the computer market.
IBM and HP
IBM system 3 and AS-400 are some examples of minicomputers.
IBM or Microsoft.
SunMicro Systems and IBM
frankly speaking i don't know.some one answer this please.
IBM's FORTRAN compiler for /390 mainframe.
IBM z15 is considered to be one of the fastest mainframes available in the market. It offers high performance, scalability, and security features tailored for mission-critical workloads.
ibm and sub microsystems
The first mainframe computer is generally considered to be the IBM 701, which was introduced in 1952. It was IBM's first commercial scientific computer and marked a significant advancement in computing technology. The IBM 701 was designed for scientific and engineering calculations and laid the groundwork for future developments in mainframe computing.
The first mainframes were large enough to fill an entire room. The mainframes today created by IBM are about the size of your household refrigerator.