Mac OS 9.1 is the update for Mac OS 9.0.x users. It includes some
stability to Finder, added Window menu, security enhancements, and
more. This page contains downloads for Mac OS 9.1 series (with model-
specific installers).

See also: [Mac OS 9.x (Integrated Download Page)][1], [Mac OS
9.0.x][2], [Mac OS 9.2.1 Universal][3], [Mac OS 9.2.2 Universal][4]

Table of Contents

 1. Mac OS 9.1
 2. International Mac OS 9.1
 3. Mac OS 9.1 Internal Edition CD-ROM
 4. Machine-Specific Installers
   1. iBook 500 Dual-USB
   2. iBook G3 Series
   3. iMac Summer 2000 DV Series
   4. iMac Early 2001 Series
   5. Power Mac G4 Digital Audio

## Mac OS 9.1

 * MacOS91CD.ZIP: Mac OS 9.1 Retail CD-ROM image.
MD5 Checksum: 232B183883D5ECD4952014D58CE2B85D

 * MacOS91CD_DE.ZIP: Mac OS 9.1 Retail CD-ROM image. (German)
MD5 Checksum: 7C9068B53853697AA8EAABFD9FF84CC6

 * MacOS91Updt_WW1.ZIP: Built CD image containing worldwide Mac OS
   9.1 Update disk images in French-Universal, German, International
   English, Italian, Japanese, Spanish, and Swedish. Also included is
   the USA English. Not available separately, you have to download
   them all instead
MD5 Checksum: 5627D5F395F7FA50FB406E02F6FFB814

 * MacOS91Updt_WW2.ZIP: Built CD image containing worldwide Mac OS
   9.1 Update disk images in Danish, Dutch, Finnish, Korean,
   Norwegian, Portuguese-Brazilian, Simplified Chinese, and
   Traditional Chinese. Not available separately, you have to
   download them all instead
MD5 Checksum: E46C572964465E21F0F747DA4799049D

## International Mac OS 9.1

See also: [Mac OS 9.1 (French)][5], [Mac OS 9.1 (German)][6], [Mac OS
9.1 (Italian)][7], [Mac OS 9.1 (Swedish) PowerBook G4 400/500][8]

## Mac OS 9.1 Internal Edition CD-ROM

This is the Mac OS 9.1 CD-ROM special edition provided by Apple IS&T;
for internal use only. It includes the base Mac OS 9.1 installer with
the guided way to install (such as unlocking disks, check drive using
Norton Disk Doctor, etc.) as well some extra goodies that were
exclusively available internally for Apple employers such as Apple
software like Apple DVD Software 2.5.1 and QuickTime 5.0, several site
licensed software such as Acrobat Reader 4.05a, Microsoft Office 2001,
Norton Antivirus 7.0, and Norton Utilities 6.0, and other nice
software.

 * MacOS91_Internal.ZIP: Mac OS 9.1 Internal Edition CD-ROM image.
MD5 Checksum: 5F73BB6E569A3D83681B0E38CEE0E330

## Machine-Specific Installers

### iBook 500 Dual-USB

See Also: [Mac OS 9.1 + X 10.0.3 (iBook 500 Dual-USB)][9]

### iBook G3 Series

This is the restore CD of iBook, came with Mac OS 9.1 and other
programs, all in one hard disk image, which to restore from it's
original form and contains bundled software like iMovie 2.0.3,
AppleWorks 6.0.4, iTunes, FAXstf, Adobe Reader, and more. This will
work for any iBook computers.

 * iBookG391CD_Rest.ZIP: iBook G3 Series restoration CD-ROM v1.1
   image. (Mac OS 9.1)
MD5 Checksum: CE07B1AC5E8BEFA689E03192BF466F10

 * iBookG391CDDE_Inst.ZIP: iBook G3 Series installation CD-ROM image.
   (Mac OS 9.1 German)
MD5 Checksum: 620066B4ABD13E7C92750F584C4D85EE

 * iBookG391CD_Apps.ZIP: iBook G3 Series applications CD-ROM image.
MD5 Checksum: 3202C302459426E45A2A0167B8E90B02

### iMac Summer 2000 DV Series

This is the install CD of iMac Summer 2000 DV. It includes the Mac OS
9.1 with Mac OS ROM 7.5.1 installer and some application installers
like AppleWorks 6 and iTunes.

 * iMacS200091CD_Inst.ZIP: iMac G3 Summer 2000 DV installation CD-ROM
   v1.2 image. (Mac OS 9.1)
MD5 Checksum: 2A260DABF3845A862C479FC1BD632265

### iMac Early 2001 Series

Install & Restore CDs of Mac OS 9.1 for iMac G3 Early 2001 Series
(Indigo/Flower Power/Blue Dalmation). The restore image includes the
base Mac OS 9.1 with AppleWorks 6.0.4, iMovie 2.0.3, Quicken 2001
Deluxe 10.0.1 and more. Later versions of restore image also includes
Mac OS X 10.0.3.

 * iMacE200191CD_Inst.ZIP: iMac G3 Early 2001 installation CD-ROM
   image. (Mac OS 9.1)
MD5 Checksum: 4AD75ED58386F802C90F9411100E4F69

 * iMacE200191CD_Rest.ZIP: iMac G3 Early 2001 restoration CD-ROM
   image. (Mac OS 9.1)
MD5 Checksum: 345154E169A6F6E17457B599E2966C22

 * iMacE200191CDDE_Inst.ZIP: iMac G3 Early 2001 installation CD-ROM
   image. (Mac OS 9.1 German)
MD5 Checksum: BD839AE3F50449C2A10E234C11F4AA43

 * iMacE200191CDv13_Inst.ZIP: iMac G3 Early 2001 installation CD-ROM
   v1.3 image. (Mac OS 9.1)
MD5 Checksum: 9DBDE06D9B9C45F22F0E5B0CD0A7533F

 * iMacE200191CDv11_Rest1.ZIP: iMac G3 Early 2001 restoration CD-ROM
   Disc 1 v1.1 image. (Mac OS 9.1 + Mac OS X 10.0.3)
MD5 Checksum: 96654F397BB4674F263FE37687176C40

 * iMacE200191CDv11_Rest2.ZIP: iMac G3 Early 2001 restoration CD-ROM
   Disc 2 v1.1 image. (Mac OS 9.1 + Mac OS X 10.0.3)
MD5 Checksum: 5AA7DFE7331C78E7781F9E57485B6BA5

 * iMacE200191CDv11_Rest3.ZIP: iMac G3 Early 2001 restoration CD-ROM
   Disc 3 v1.1 image. (Mac OS 9.1 + Mac OS X 10.0.3)
MD5 Checksum: 88D003E1ED7A10AAFDC1F4E329020CC5

 * iMacE200191CDv11_Rest4.ZIP: iMac G3 Early 2001 restoration CD-ROM
   Disc 4 v1.1 image. (Mac OS 9.1 + Mac OS X 10.0.3)
MD5 Checksum: ABFCFC5D225D138623E1B8E63B3554FC

 * iMacE200191CDv11_Apps.ZIP: iMac G3 Early 2001 applications CD-ROM
   v1.1 image.
MD5 Checksum: 6D76C098623F97A5489AE703A8A705D3

### Power Mac G4 Digital Audio

Install & Restore CDs of Mac OS 9.1 for Power Macintosh G4 Digital
Audio.

 * PMG4DA91CD_Inst.ZIP: Power Mac G4 Digital Audio installation CD-
   ROM v1.2 image. (Mac OS 9.1)
MD5 Checksum: 9D9176E02AB99C9FC6BDE484595929FD

 * PMG4DA91CD_Rest.ZIP: Power Mac G4 Digital Audio restoration CD-ROM
   v1.2 image. (Mac OS 9.1)
MD5 Checksum: 323F98034AAB0E5A29BDBB9EE35BF422

 * PMG4DA91CDDE_Rest.ZIP: Power Mac G4 Digital Audio restoration CD-
   ROM v1.0.1 image. (Mac OS 9.1 German)
MD5 Checksum: B597110624B4B9D1802259F829824051

Compatibility
Architecture: PPC

Mac OS 9.1 and later could not boot successfully on SheepShaver
because it lacks a memory management unit (MMU). However, there are
some ways to get 9.1 working on SheepShaver by hacking the System file
or replacing the System file from Mac OS 9.0.4 and changing version
number to 9.1 using ResEdit, but this may result in system
instability.
If you are running a 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, a Power Mac 61/71/8100/9150 with a third-party accelerator card
will not install Mac OS 9.1.

  [1]: http://macintoshgarden.org/apps/mac-os-9x-project-replace-existing-page
  [2]: http://macintoshgarden.org/apps/mac-os-90-904-update-90-imac-dv-ibook-g3-g4-agp-904-g4-cube-g4-gigabit-ethernet-pb-g3-firewire
  [3]: http://macintoshgarden.org/apps/mac-os-921-universal
  [4]: http://macintoshgarden.org/apps/mac-os-922-universal
  [5]: http://macintoshgarden.org/apps/macos-f-91-french
  [6]: http://macintoshgarden.org/apps/macos-d-91-german
  [7]: http://macintoshgarden.org/apps/macos91ita
  [8]: http://macintoshgarden.org/apps/powerbook-g4-400500-installera-%C3%A5terskapa-program-cd-set-swedish
  [9]: http://macintoshgarden.org/apps/ibook-restore-medias-3021304330643065306630673068308430943095

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