... memory can be used today instead of the 1MB used previously. The processors architecture has also changed. They have expanded in size from a 32bit to a 64bit which means the CPU can now carry out larger data instructions. The Registers have also been upgraded since the x68 was first made available to businesses. They have expanded up to sixteen 64bit general purpose registers and sixteen 64bit floating point registers within the mainframe itself. The General Purpose Registers hold data and addresses, and can also join together to allow the CPU to accept 128bit data. Addressing is performed in two stages within a mainframe. The first stage involves the instruction address that resides in the instruction pointer register and the data address that is calculated from an address stored in a register, indexed, or included as part of the instruction word. The second stage translates the addressed calculated in stage one into ...

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