This disk image (.nib format) contains a “DOS 3.2 System Master” dated 3/21/1990. The most interesting thing on here is an Integer Basic program called “WOZBOOT 13” that claims to have been written by Woz himself.

I have not been able to get the disk to boot in any emulator, but I was able to MUFFIN the file to DOS 3.3 in Virtual ][.

The other curiosity is… who would create a pretend/updated DOS 3.2 master disk in 1990? Well, based on the writing on the disk and other hints, that'd be 13-year-old me. I guess I didn't have much going on that year.