Comment by guerrilla
14 days ago
Back then there were quite a few competing architectures and UNIXes to go with them. SGI MIPS with Irix, IBM had POWER with AIX and later Linux, DEC had Alpha Tru64 UNIX and VMS (not a UNIX), Sun SPARC with Solaris, HP had HA-RISC with HP-UX. Only SPARC and POWER survived for long and only POWER survived until today as far as I know. Solaris of course lives on in various forms. The old UNIXes I guess mostly do not, being displaced almost entirely by Linux and BSDs.
IBM apparently still releases updates for AIX on POWER.
They still build POWER infrastructure too, but as far as I know Linux pretty much dominates. You can even buy POWER workstations from third party vendors like Raptor Computing Systems. Very expensive though.