History and elements of a Modern Mainframe Computer
Mainframe computers are crucial for some of the largest corporations in the world. Each mainframe has more than one modern processor, RAM ranging from a few megabytes to several-score gigabytes, and disk space and other storage beyond anything on a microcomputer. A mainframe can control multiple responsibilities and serve thousands of users every second without downtime.
The chief difference between mainframes and other computing systems is the level of processing that takes place. Mainframes are also different in terms of data bandwidth, organization, reliability, and control. Big organizations-banking, healthcare, insurance, and telecom companies, etc.-use mainframes for processing basic commercial data.
In this article, we discuss the evolution of mainframe computers and their elements.
History of mainframe computers
IBM developed a crucial part of mainframe computing, the Automatic ordern Controlled Calculator (ASCC) for arithmetic operations, in 1944. From the late 1950s by the 1970s, several companies manufactured mainframes: IBM, Burroughs, RCA, NCR, General Electric, and Sperry Rand, for example. Since then, System/390 by IBM is the only kind of mainframe in use. It evolved from IBM’s System/360 in 1960.
An Early mainframe occupied a huge space. New technologies have drastically reduced the size and cost of the hardware. A current-generation mainframe can fit in a small closet.
elements of a modern mainframe computer
Like a PC, a mainframe has many elements for processing data: operating system, motherboard or main board, processor, controllers, storage devices, and channels.
• Motherboard: The motherboard of a mainframe computer consists of a printed circuit that allows CPU, RAM, and other hardware elements to function together by a concept called “Bus architecture”. The motherboard has device slots for input cards and cable interfaces for various external devices. Where PC motherboards use 32- or 64-bit buses, mainframes use 128-bit buses. General instructions regarding the internal architecture help the motherboard connect to the other devices and retrieve data using binary computation.
• Processor: A CPU acts as the central processing point in mainframe architecture and includes an Arithmetic Logic Unit (ALU) for performing arithmetic calculations. It also works as a controller for the bus architecture and handles traffic and data requests. The processing strength of mainframes is much higher compared to PCs, so that they can manager huge amounts of data.
• Storage devices: Storage devices are for entering, retrieving, storing, and recording data. Many are external devices, such as hard drives, tape drives, and punch card readers, all connected to terminals of the mainframe and controlled by the CPU. Their capacity for data storage can be hundred or already thousands of times that of a PC.
• Communication controllers: Communication controllers allow far away computers to access a mainframe. With the help of networks, LAN or WAN, communication controllers establish connections with various devices, perform data transmission over communication channels, and keep track of users at terminals.
• Channels: The “channels” are the cables used to connect the CPU and the main storage to other parts of the system and make sure that data is moved in a methodic way without losing its integrity.
Modern mainframes have progressive features such as expanded service management capabilities, cross-platform integration facilities, etc. and consequently are appropriate for basic data center operations. The cost of maintaining modern mainframes is much less compared to older models.