The AS/400 uses the PowerPC microprocessor with its reduced instruction set computer technology. Its operating system is called the OS/400.
What operating system does AS400 use?
IBM AS/400e model 730Also known asAS/400e, eServer iSeries, eServer i5, System iOperating systemOS/400 (later known as i5/OS and IBM i)CPUIMPI, IBM RS64, POWERPredecessorIBM System/38, IBM System/36
Is AS400 Unix?
IBM’s version of Unix, called AIX, can be run in the PASE environment on an AS400. An AS400 isn’t the AS/400. The original AS/400 system evolved into the iSeries, then the System i, and then IBM i on Power Systems. AS400 has become a generic term covering all of these systems.