IBM 7090: Difference between revisions

An upgraded version, the '''IBM 7094'''., was first installed in [[September]] [[1962]]. In [[April]]It [[1964]],had theseven firstindex '''7094registers, II'''instead wasof installed,three whichon hadthe almostearlier twicemachines. asThe much7094 generalconsole speedhad asa thedistinctive 7090box dueon totop athat fasterdisplayed clocklights cyclefor andthe introductionfour ofnew overlappedindex instruction executionregisters. The 7094 hadintroduced double-precision floating point and additional instructions, but was largely [[backward compatible]] with the 7090, though. minorMinor changes in instruction formats, particularly the way the additional index registers were addressed, sometimes caused problems.

LaterIn [[1963]], IBM introduced lower cost machines with a similar architecture, but fewer instructions and simplified I/O, called the '''[[IBM 7040]]''' and '''7044.''' 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 and introduction of overlapped instruction execution.