MacOS91CD.ZIP: Mac OS 9.1 Retail CD-ROM image.
MacOS91CD_DE.ZIP: Mac OS 9.1 Retail CD-ROM image. (German)
MacOS91Updt_WW1.ZIP: Built CD image containing worldwide Mac OS 9.1 Update disk images. (Disc 1)
MacOS91Updt_WW2.ZIP: Built CD image containing worldwide Mac OS 9.1 Update disk images. (Disc 2)
iBookG391CD_Rest.ZIP: iBook G3 Series restoration CD-ROM v1.1 image. (Mac OS 9.1)
iMacS200091CD_Inst.ZIP: iMac G3 Summer 2000 DV installation CD-ROM v1.2 image. (Mac OS 9.1)
Mac OS 9.1 and later could not boot successfully on SheepShaver because it lacks memory management unit (MMU). However, there are some ways to get 9.1 working on SheepShaver by hacking the System file or replacing System file from Mac OS 9.0.4 and changing version number to 9.1 using ResEdit
, but this may result system instability.
If you are running PowerBook 3400c, use the update without updating hard disk drivers.
For PowerBook 1400s, Password Security is not supported.
For 20th Anniversary Mac, disable Virtual Memory.
For Power Macintosh 6100/7100/8100, you need to install from the CD version, updating from 9.0.x is not supported.
Also, for PowerMac 61/71/8100/9150 with a third-party accelerator card will not install Mac OS 9.1.