All AIX applications based on AIX Version 3.2 and for use with POWER, POWER/2, and POWERPC-based models, will run compatibly on AIX Version 4.3 without recompilation for those same models. The only exceptions to this statement are applications using:
or applications compiled using POWER2- or PowerPC-specific compiler options, but executed on models other than POWER2 or PowerPC.
Any program that must run in all environments (POWER, POWER2, and PowerPC models 601 and higher) must be compiled using the common mode of the compiler. Programs compiled to exploit POWER2 technology must be run on POWER2-based processors. Existing code need not be recompiled to run.
Applications created on a system using AIX Version 4.3 may not function reliably on a system using AIX Version 3.
Applications must have been created using the AIX shared libraries for these statements to apply.
A system using AIX Version 3.2 can operate as a server system for client machines using AIX Version 4.3 with the following exceptions:
Font servers may be required on the AIX Version 4.3 clients to reliably handle AIXwindows between server and client.
A system using AIX Version 4.3 may operate as a server system for client machines using AIX Version 3.2 or greater as long as the necessary compatibility options are installed. All statements about binary compatibility apply in this case. AIX Version 4.3 applications may not execute reliably on AIX Version 3 systems using remote network mounts of AIX Version 4.3 file system.
For further details about the differences between AIX Version 4.3 and earlier versions of AIX, see the AIX Version 4.3 Differences Guide, order number SG24-2014.