How can you configure the MAME emulator for different hardware (hardware cards) in the available slots of the emulated system? For example, how can you put in different cards in the emulated Apple card slots?
(Background: I recently found out that MAME emulates the Echo II speed synthesizer card, but wasn't able to figure out how to make it work. I had to ask on the MAME IRC channel, because apparently this is documented nowhere, you need to ask, or you need to know ...)