On my AES system using a NeoSD, AOF3 pauses just fine no matter what home mode I try or how I get there (using unibios 3.0). In MAME it will only pause in AES mode if I start the session in AES mode. Switching from MVS->AES and soft rebooting, I can't pause. In MAME I have unibios 3.1 and 3.2...