In order to install and run Mac OS 8.5, you will need the following system configuration:
- One of the following Mac OS-based Apple computers with a PowerPC processor:
- iMac
- Power Macintosh G3
- Any Power Macintosh, PowerBook, or Workgroup Server computer with a 4-digit model number.
- Mac OS 8.5 may not function with a Mac OS 8.5 compatible Apple Power Macintosh computer that has been upgraded with a non-Apple processor upgrade card. Please check with the card's manufacturer for compatibility information.
- Computers upgraded with Apple's Power Macintosh 233-MHz Processor Upgrade Kit are supported.
- The Power Macintosh Upgrade Card (supported in the Quadra 700), the Macintosh Processor Upgrade (supported in the 575), and all 680X0 processors are NOT supported with Mac OS 8.5.
- 150 MB to 250 MB of free disk space
- 16 MB of physical RAM, with virtual memory (VM) set to at least 24 MB
- The minimum amount of RAM will let the computer perform only at minimum performance. Installing additional RAM will increase the system performance.
With VM turned off there may be up to a 10 MB difference in RAM usage. This difference is normal and due to the decreased RAM requirements of the system software when VM is on (due to code-mapping).