Enabling MAME Core for Computer Systems with RetroArch

Taking a stab in the dark, I could guess it's a good idea to enable the MAME core for computer systems. After looking at what that parameter does, I've come across an issue where I can't find a solution to bring up the MAME menu when using the MAME core under RetroArch.

For the MAME core, I've found a workaround by using the additional parameter `-ui_active`, which allows the TAB key to work. However, this doesn't seem to be the case for both standalone MAME and RetroArch. When trying to use parameters like `apple2e -ui_active -flop1`, I get an error message indicating that those are MAME parameters and won't work with RetroArch.

In theory, if the RetroArch menu comes up with a F1 key press by default, there should be no problem doing the same with the MAME Retroarch core. Unfortunately, this is not the case when running a MAME core in RetroArch.

One option to access the MAME menu is still possible using the TAB button as the default button or an alternative button if you've changed it. My current parameters for running Apple II roms are `apple2e -flop1`, which requires at least 4096 frames to run.

However, I'm having trouble switching disks during gameplay. In standalone MAME, I can use the TAB key and then select the second disk. Unfortunately, this doesn't seem to be possible with RetroArch. For some games, there are multiple files in a zip archive, which makes it difficult to switch disks.

As I'm using the MAME core to run my Apple II roms (set using a hash file), I'd appreciate any help or guidance on how to manage disk swapping during gameplay within RetroArch.

Retroarch mame core