You could also select a memcard file on the file chooser tab and click the "save" button (top-left corner) to make it a stored device configuration.
Thanks. Though with file chooser, I believe you can either select a memcard OR a cdrom image, but not both, since it seems geared to accept only the current selection, even if I save the configuration. IOW if I select "memcard" and choose a memory card, save configuration, then switch to "cdrom" and choose an image, then click psu from the list of machines on the left, QMC2 will only launch MAME with the -cdrom directive and forgets about setting the -memcard directive.
I assume this is because file chooser is intended to be used for simple, single-device selections; whereas for more complex cases like the psu you'd want to use device mapping. Although in that case, I wonder what benefits the file chooser really offers, since the device mappings tab seems to cover all possible use cases nicely - and has its own "file chooser" when you click a folder, which seems pretty intuitive to me. Device mappings also covers the use case involving configuring MAME to auto-create a memory card - which I assume isn't possible in the file chooser given that it expects you to *choose* something that already exists.
At least, would you consider adding an option to view "Stored device configurations" under the file chooser tab as it is currently for the other two tabs, since you can affect such configurations within the file chooser tab?
Which "new" memcard slots do you mean?
I was just wondering whether memcard slots could be listed under slot options. Currently the only slot options that appear are gamepad-related for port1 and port2. I assume this is because MAME sees memcards as devices rather than "slots" - however, the psu of course did have memory card "slots".