What is Mac OS 0.x (1.0 pre-release)? Those are single sided (400KB) disk images of Mac OS 1.0 pre-release, which cannot be mounted on anything else than an early B&W Macintosh or Mini vMac (it will NOT mount on a PPC or Intel system at all). - 128k-guided-tour.img : This is the very first Macintosh 128K guided tour floppy disk from January 1984 (bootable in Mini vMac) - System 0.97, Finder 1.0.img : This is Mac OS 0.97 pre-release from January 1984 (bootable in Mini vMac) - System 0.85.img : This is Mac OS 0.85 pre-release from January 1984 (this crashes Mini vMac at the time of this writing) 128k-guided-tour.dsk(400 KiB / 409.6 KB) 128K Mac Guided Tour / Single sided (400KB) floppy disk image / DSK image 248 / 2016-12-01 / 6c569e9950b173d7f8c017c5bd29514adcc1ad92 / / S-97F1-0.dsk(409.46 KiB / 419.28 KB) Mac OS 0.97 pre-release / Single sided (400KB) floppy disk image / DSK image 161 / 2017-11-14 / 32c6ba62ff3831a780adb86f706914d3205b054c / / System_0.85.dsk(400 KiB / 409.6 KB) Mac OS 0.85 pre-release / Single sided (400KB) floppy disk image / DSK image 261 / 2016-12-01 / a24cc210d4e92b4eaead42de7b5b3c3d664d35d2 / / Architecture Motorola 68K Single sided (400KB) disk images, only to be mounted using Mini vMac or an early 80's B&W Macintosh. Emulating this? It should run fine under: Mini vMac |