by justin66 3 hours ago
Oddly enough, the SGI Fuel (also the Tezro, I think) had PS/2 keyboard and mouse ports but also offered USB ports and support for HID devices in IRIX.
I have no idea whether the keyboard and mouse that shipped with those later SGIs were PS/2 or USB devices.
edit: IMO there was nothing wrong with preferring PS/2 to USB 20-some years ago. Higher theoretical refresh rate on the PS/2 mouse at that time and the PS/2 keyboard offered better n-key rollover, although I question whether any of that mattered one way or the other to an SGI owner
In x86 i386 world there was a good long overlap of ATX/MicroATX motherboards shipping with both PS/2 keyboard/mouse ports and also USB ports on them, starting from 1998 era Pentium 2/3 systems when USB first became commonplace and continuing until probably 2010 or so.