Got it working under Mame-lr2003, but not sure why. See the ending of this thread for my post about it.

We all miss things. That’s why being on this forum is great. If one of us misses something, someone else will pick it up

@tonydotigr All of the information on the I-PAC applies to the Mini-PAC. So you will have a default setup that is ready to use with MAME. Anything else will require you to reconfigure the controls on a per emulator basis or go and adjust the default configuration in hardware.

@RandoCalrisian sorry. I wish I wish I knew more about the firmware. My IPAC4 device is an older version that uses a PS/2 to USB converter and it does not get recognized as a game pad at all. It's my understanding that this issue affects only the newer versions of these devices. I hate to send people to Andy for support every time, but as far as I know, he has been the only source cited by people who have obtained the replacement firmware. However, perhaps he has now incorporated it into the utility available online.