I expect there is a simple command for this whose name I don't know.

I've got a RPi 3 with recent Raspbian Lite installed. I'm trying to use
it for a MAME box. I've got MAME4All (I think it was) installed and a
collection of ROMs from archive.org.

I'm booting to console and starting mame by hand, for now, I intend to
have it boot into mame later. To run mame, I had to add a few libraries
that were not already installed (eg SGL). Now I can run it, and reach
the front end GUI to select a ROM set.

Then the screen goes black and I can't get anything else out of it,
not even alternative virtual consoles.

I think what's happening is that the GUI is trying to run another
program (the emulator itself) and running into some simple error, like
maybe another library I need to install. But because the screen is not
in text mode, I never see the error message.

So, if this sounds plausible, what's the command I can use to restore
text mode to my screen after a graphics mode program has failed?

  $ mame/mame || restoreFOO

Elijah
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remembers using some restoreFOO for recovery from X11 problems ages ago

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