Mac OS 8.1
| Build of Mac OS 8 | |
 | |
| Architecture | 68k, PPC |
|---|---|
| Compiled | 1997-12-09 |
| About |  |
Mac OS 8.1 is a version of Mac OS 8 released on 19 January 1998, which is the last version of Mac OS to run on 68k processors. This version is also the default operating system for the "Blue Box" emulation layer in both of the Apple Rhapsody Developer Releases.