Logon as adm
run: disp+work -version
Look for the compilation mode in the result. Example below
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disp+work information
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kernel release 700
kernel make variant 700_REL
compiled on AIX 2 5 005DD9CD4C00
compiled for 64 BIT
compilation mode UNICODE
compile time Oct 29 2006 20:39:06
update level 0
patch number 83
source id 0.083
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supported environment
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database (SAP, table SVERS) 700
operating system
AIX 1 5
AIX 2 5
AIX 3 5