Biografia
An upgraded version, the IBM 7094, was first installed in September 1962. It had seven index registers, instead of three on the earlier machines. The 7094 console had a distinctive box on top that displayed lights for the four new index registers. photos The 7094 introduced double-precision floating point and additional instructions, but was largely backward compatible with the 7090. Minor changes in instruction formats, particularly the way the additional index registers were addressed, sometimes caused problems. On the earlier models, when more than one bit was set in the tag field, the contents of the two or three selected index registers were OR'ed, not added together, before the decrement took place. On the 7094, if the three bit tag field was not zero, it selected just one of seven index registers, however the "or" behavior remained available in a "multiple tag" compatibility mode.
In April 1964, the first 7094 II was installed, which had almost twice as much general speed as the 7090 due to a faster clock cycle, dual memory banks and improved overlap of instruction execution, an early instance of pipelined design.
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