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