So far, I've used Unix (or Unix-likes) on the following machines:

x86:
- Compaq LTE 5300 (FreeBSD, Xenix-386)
- Kapok Whitelabel Pentium MMX machine (FreeBSD, RHL 5.0.5, Caldera OpenLinux, Mandrake, OS X Rhapsody)
- Core 2 Duo shitbox (FreeBSD, OpenBSD, NetBSD, various Linux distros, plan9front)
- Whitelabel Skylake machine (FreeBSD and variants, OpenIndiana, Solaris, plan9front, various Linux distros, OS X (does that even count?))
- My Current Zen 3 Desktop (Linux)
- My Current Zen 3 Laptop (Linux, FreeBSD)

VAX:
- MicroVAX 3900 (OpenVMS, NetBSD)

m68k:
- Macintosh SE (MaxMinix 2)
- Maxintosh IIfx (A/UX 3)