> What does OSD (or OSD layer) stand for (top of src/emu/inptport.c)?
Normally On-screen display, but in the MAME universe it means OS-Dependent. Basically all it takes to write a port of MAME is wrap the MAME video/audio/input framework to your OS (say for Windows, DirectX and Win32). Details in http://mamedev.org/source/src/osd/
> What is a "BTNAB"?
A Bug That's Not A Bug - basically, a bug present in the original game, or something that is actually by design in the game. Pluralized as Bugs That Aren't Bugs. You can find a list here: http://mametesters.org/mantis/search.php...de_status_id=-2 Although it is somewhat incomplete, leaving other categories out. I can't recall the origins of the phrase, but it's tied to MAMETesters.org.
> What does "over-equal weight calibrate" mean?
He made up a phrase. He's saying that on some games that have self-calibration routines, moving the joystick mostly on one side would skew the calibration results.
> What does '"720"ing a whole lot' mean?
I think he's saying if you spin the joystick through its axis of rotation multiple times before you push start, or before you insert a credit, does it make a difference to your ability to control the game, in case the game has some sort of self-calibration code. (I don't think it will, in your other thread you mention the game has a joystick calibration menu in the Test menu). But I'm sure he'll be replying soon.
- Stiletto
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