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The original version of the Mac OS installed on each recent -- G3 and later -- Mac is listed below. This can be particularly useful for those purchasing a Mac for "legacy" software use. Earlier versions of the Mac OS are not supported on each system. Mac OS 9/Classic Support may additionally be of interest.
For complete specs on a particular system, click on the name of the Mac (left column). For all Macs that match a specific minimum version of the Mac OS -- courtesy of EveryMac.com's Ultimate Mac Sort -- click the Original Mac OS of interest (right column).
In addition to specs listed By Capability, EveryMac.com offers Apple Mac specs listed By Year, By Identifier, By Processor, By Case Type, and By Global Original Prices. Currently Shipping Macs also may be of interest.
If you are not sure which Mac you have, look it up by Order Number, Model Number, EMC Number, Model Identifier or Serial Number "Snippet," with EveryMac.com's Ultimate Mac Lookup. If you need help, refer to Mac Identification.
Also see: What applications are not compatible with Mac OS X 10.7 "Lion"? What upgrade or substitution options are available for common incompatible applications?