Creating the Installation Media
In the early days of product development, A/UX was available pre-installed on an 80MB hard drive. As the product matured, floppy, tape, and eventually cd-rom versions were produced. The vast majority of my readers are installing version 3.0.1 from cd-rom. If you have the original installation media, feel free to skip this section entirely. Otherwise, read on...
The A/UX CD images are not available on this site. The product is still covered under multiple copyrights, some of which are owned by highly litigious companies... So, I will assume you purchased a legitmate copy of A/UX back in the early 1990's, and made a perfectly legal backup of the installation CD. You certainly did not download it from the internet... That would be illegal.
Decompress the image, rename it to an iso, and burn it with your favorite cd-burning software. The A/UX installation CD contains a Macintosh partition and a Unix partition. If the disk was created properly, the former should be visible under MacOS. If not, then something went horribly wrong and you should start over. Once you have a good, readable installation CD, pick a boot disk (Disk Copy 6.3.3 format):