IBM used central switched architecture on its 700/7000 and 360 systems
IBM 701: In 1953, IBM released the first electronic stored program computer, 701 for scientific applications.
IBM 702: In 1955, IBM released 702 for the business applications.
IBM 360: IBM 360, the basic architecture of IBM mainframes was not compatible with the older IBM systems. 360 product line was incompatible with older IBM machines.
It was so expensive, like hundreds of thousands of dollars. IBM introduced its family concept with this in 1964.
Family concept: introduced by IBM with its System/360 in 1964 followed shortly thereafter by DEC, with its PDP-8.
Digital equipment corporation’s PDP-8 is small enough that can be kept on a desk. Even though it is cheaper, it is not as powerful as the IBM mainframe
IBM 7094: This has the instruction backup register for buffering the next instruction. Also it has the multiplexor which is the central termination point for CPU, memory and the data channels and schedules access to memory from CPU and data channels so that these devices can act independently.
PowerPC: IBM made an alliance with Apple and Motorola developer of 68000 series of microprocessors resulting in a series of machines implementing PowerPC architecture. The PowerPC architecture is a superscalar RISC system which was used in Apple Macintosh machines and many embedded chip applications.
IBM 601: This was a 32-bit machine whose main aim was to bring PowerPC architecture to marketplace as soon as possible.
IBM 603: This was a 32-bit low cost, well-organized implementation for low end desktop and portable computers. It has a smaller 16 KB cache.
IBM 604: This was also a 32-bit implementation with efficient superscalar design techniques, mainly intended for desktop computers and low end servers and has32 KB cache.
IBM 620: This was a 64 bit architecture intended for high end servers.
IBM 740/750: This is also known as G3 processor and has 2 levels of cache in main processor chip with the L1 cache size same as 620.
G4: Here both the parallelism and internal processor speed are enhanced.
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