A/UX Version 2.0
Before attempting this procedure, you should verify that your hardware is compatible with A/UX 2.0 - A/UX bypasses the Macintosh Toolbox, and communicates directly with the hardware, so if your Mac is not on the compatibility list, you're out of luck. This also rules out any of the current Macintosh emulators - Unless your emulator accurately replicates the low-level functions of the PMMU, FPU, and SWIM chips, it will not work.
Before we proceed, I assume you have the A/UX 2.0 installation CD, and the setup floppies. If not, please check out the "software" section first. The floppies are 800KB Disk Copy 6.3.3 format, and must be written on a Macintosh. If you don't have any 800KB floppies, you can convert 1.4MB disks by covering the HD indicator hole with masking tape.
Now that we have the installation media, let's get started! The first thing you need to do is partition the hard drive. I have created an A/UX 2.0 tools disk for this purpose. It contains the Apple HD SC partitioning utility, and the cd-rom hack extension. Boot from this floppy, and partition your drive to look something like this:
The classic Macintosh cannot boot directly into Unix - It boots to Mac OS first, then uses an A/UX Startup utility to kickstart into Unix. After installing Mac OS 6.0.7, copy the "cd-rom hack" extension from the A/UX 2.0 Tools disk - drop this in the System Folder, and reboot. Now you should have a fully functional Macintosh System 6 with cd-rom support.
Copy the contents of the "Startup" and "Startup Utilities" floppies to the Mac partition - You will use these later on to boot into A/UX. Now would be a good time to note the SCSI ID of your hard drive and cd-rom... You will need this info shortly.
Now the fun begins... Insert the "Floppy Launch" disk, and double-click the "A/UX Install" icon:
If all goes well, the A/UX Installation routine will ask for a "floppy with an A/UX filesystem." Insert the "Root Floppy" to continue:
The installer will ask several questions regarding your regarding your hard drive, and the installation media... It will also ask you the SCSI ID of the hard drive and the CDROM
After about a page of questions, you will be prompted to reboot... Installation stage 1 is complete
Once you boot back to MacOS, double-click the "Read_Disk" utility and insert the "Kernel Archive" floppy. The installer will select a kernel, and copy it to your new A/UX 2.0 system.
Close the "Read_Disk" program, and double-click the "A/UX Startup" utility. This will launch stage #2 of the installation. Stage #2 loads the remaining A/UX files from the installation CD onto the hard drive... Completing the installation.
After booting into A/UX, you can build a custom kernel using the 'newconfig -v' command: