StructureWorld Alpha18_14a Mac OS
Mac OS 7 was a major change from the earlier System Software, introducing integrated multitasking, a revamped desktop, networking, and transitioning the name from 'Macintosh System Software' To 'MacOS'. It was followed by by MacOS 8.x.
Running Mac OS 7.x requires a Motorola 68000 based Macintosh, a supported model of Power PC based Macintosh (7.1 or later) or one of the following emulators:
Look at the folder structure of a typical OS X installation. Open a Finder window and click the icon for your hard drive (which is typically called Macintosh HD) in the Sidebar. You should see at least four folders: Applications, Library, System, and Users. Within the Users folder, each user has his own set of. Mac OS 8.x was very much a stop-gap version which was brought out to try and keep the Mac OS moving forward during a very trying time for the platform. 8.0 added a number of features from the stillborn Copland project, while leaving the underlying operating system unchanged. The GUI was changed in appearance to a new greyscale look. Purchase AppleCare+ for Mac to extend your coverage to three years from your AppleCare+ purchase date and add up to two incidents of accidental damage protection every 12 months, each subject to a service fee of S$138 for screen damage or external enclosure damage,. Samba (2:4.2.14+dfsg-0+deb8u1) jessie; urgency=high. New upstream release. + Fixes CVE-2016-2119: Client side SMB2/3 required signing can be downgraded. + Various fixes for regre.
Mini vMac - Runs MacOS 1.1-7.5.5, emulates a black and white Motorola 68K based Mac Plus
Basilisk II - Runs MacOS 7.x-8.1, emulates later color Motorola 68k based Macs.
SheepShaver - Runs MacOS 7.5.2-9.0.4, emulates a Power PC based Macintosh.
Screenshots
Release notes
Structureworld Alpha18_14a Mac Os Catalina
Release 7.6 was the first version to officially use the name 'Mac OS'. 7.6 increases support for PPC based Macintosh computers and includes OpenDoc.

Mac Os Catalina
Applications that require 24-bit addressing will no longer run under this version.
Installation instructions
Mac Os Download
Requires at least a 68030 CPU with 32-bit clean ROM. Drops support for many older Mac models including Mac Plus, XL, Mac II, IIx, LC, IIcx, and SE/30.The 7.6.1 CD below seems to be not machine specific.