Intel Unix System V 2.x

Intel Unix System V was a rather uncommon Unix variant developed and distributed by Intel, for IBM PC compatible hardware. It was considered "plain vanilla" compared to other distributions, adding little beyond AT&T's codebase.
Comments
86Box v3.0
Machine Type: i386DX/i486
Machine: Award 486 Clone
CPU Type: Intel i486SX
CPU Speed: 25
FPU: 487SX
Memory: 16MB
Video: Video 7 VGA 1024i (HT208)
HD Controller: Internal
FD Controller: Internal
Hard Disk: 1023 Cylinder, 15 Head, 17 Sector, 127MB IDE Drive on Channel 0:0
A Drive: 5.25" 1.2M
B Drive: 3.5" 1.44M
Be sure to go into the machine's BIOS and specify the floppy and hard disk sizes.
Forget exactly which boot disk to go with. Try the ST-506 one first.
What you can do is use a machine in 86box that supports SCSI.
Pack a lunch, and maybe dinner too.
Apart from that? Revolution's config recommendation for 86Box seems solid, though I've set it up as a 486DX4/100 not an SX.
Screenshot of my working config: https://gyazo.com/f5ab4f9b396155c30281de7f06e8b767