isa_bits specifies whether 64-bit or 32-bit Solaris 9 packages are to be installed.
bit_switch represents the option 64 or 32, which you use to indicate whether 64-bit or 32-bit Solaris 9 packages are to be installed. If you do not set this keyword in the profile, the JumpStart program installs systems as follows:
64-bit packages on UltraSPARCTM systems
32-bit packages on all other systems
If you use the isa_bits keyword, you must also use the latest check script in the solaris_9/Misc/jumpstart_sample directory on the Solaris 9 Software 1 of 2 CD or on the Solaris 9 DVD.