The 3090 is a mainframe computer that International Business Machines, better known as IBM, first introduced in 1985. As a mainframe, the IBM 3090 consists of a large, structural frame that has all of its computing elements, like chips and processors, hanging or mounted inside. Engineers use the mainframe for processing data in bulk, which is incredibly helpful when it comes to – for example – analyzing statistics or carrying out financial transactions. The precise amount of storage in megabytes, or MB, that an IBM 3090 provides varies from model to model. The 300E model, as an example, has 128 MB of central storage and 128 MB of expanded storage. An IBM 3090’s hard disk unit provides additional storage space. A disk unit can contain four, eight or twelve disks depending on the specific mainframe model, with each disk supplying between 3.7 and 22.7 gigabytes of storage.
