[Oberon] Project Oberon 2013 on RISC-V

[Andreas Pirklbauer]

    > Are you testing the emulator on MacOS Big Sur? Apple has added a “feature” that
    > verifies programs at start by sending a hash value to an Apple service that helps
    > the system to check for known malware hashes. This also applies to self-compiled
    > code. This can lead to a significant slowdown for the first start (and after every
    > recompile), see also https://sneak.berlin/20201112/your-computer-isnt-yours/

No, that’s not it. It’s also slower on older versions of macOS. Also, on the same
machine oberon-risc-emu (RISC5) version is much faster.

    > Rikke has modified the emulator quite a bit and it seems the Alt functionalily
    > got lost along the way. The attached diff should restore the Alt key function.
    >
    >  --- src.orig/sdl-main.c	2020-12-28 19:18:27.000000000 +0100
    >  +++ src/sdl-main.c	2020-12-28 19:18:48.000000000 +0100
    >  @@ -60,8 +60,6 @@
    >    {SDL_PRESSED, SDLK_RETURN, KMOD_ALT, 0, ACTION_TOGGLE_FULLSCREEN},
    >    {SDL_PRESSED, SDLK_f, KMOD_GUI, KMOD_SHIFT,
    >    ACTION_TOGGLE_FULLSCREEN}, // Mac?
    >  -   { SDL_PRESSED,  SDLK_LALT,   0, 0,                  ACTION_FAKE_MOUSE2 },
    >  -   { SDL_RELEASED, SDLK_LALT,   0, 0,                  ACTION_FAKE_MOUSE2 },
    >  };

Thanks. The “Alt" functionality is now back! It would be good if this change were
also back-ported to the emulator - for the Mac users out there..