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==Software retrocomputing==
As old computer hardware becomes harder to maintain, there has been increasing interest in computer simulation. This is especially the case with old [[mainframe computer]]s, which have largely been scrapped and have space, power, and environmental requirements which the average user can't afford. The memory size and speed of current systems enable simulation of many old systems to run faster that that system on original hardware {{citation needed|date=February 2023}}.
One popular simulator, the history simulator [[SIMH]], offers simulations for over 50 historic systems, from the 1950s thru the present. The [[Hercules (emulator)|Hercules]] emulator simulates the IBM System/360 family from [[System/360]] to 64-bit [[IBM Z|System/z]]. A simulator is available for the [[Honeywell]] [[Multics]] system.
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Software for older systems was not [[copyright]]ed, and was [[open source]], so there is a wide variety of available software to run on these simulators.
Some emulations are used by businesses, as running production software in a simulator is usually faster, cheaper, and more reliable that running it on original hardware.{{citation needed|date=February 2023}}
==In popular culture==
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