already added.
Use this new build.
http://www.virtualdub.org/beta/Altirra-2.00-test7.zip
http://www.virtualdub.org/beta/Altirra-2.00-test7-src.zip
changes:
MultiJoy 8 support, OSS 034M cartridge mapper split to fix ambiguous mapping issues, emulation support for the IDE half of the KMK/JZ IDE device, and call graph profiling support in the debugger.
hmm, the list of changes does not even mention multijoy interface.
and in the settings I could not find options to enable multijoy.
or something I do not understand or author forgot something.