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etabeta78 b4834b7595 (MESS) sms/gamegear: misc improvements [Enik Land] 
- Renamed the gear2gear port to EXT port, after reading the references
  in the official GG documents
- Invert Y1 pin signal bits: now high is 1 and low is 0;
- More complete Y1 behavior: goes low only for transparent pixels;
- Fix color of column 0 when it doesn't completely entered in the active display;
- Improve behavior of sprite overflow, to not be flagged when VINT is active.

out of whatsnew: the new Y1 pin behavior of the SMS VDP is based on Charles' findings and TMS9918 manual.
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README.md

README.md

What is MAME?

MAME stands for Multiple Arcade Machine Emulator.

MAME's purpose is to preserve decades of video-game history. As gaming technology continues to rush forward, MAME prevents these important "vintage" games from being lost and forgotten. This is achieved by documenting the hardware and how it functions. The source code to MAME serves as this documentation. The fact that the games are playable serves primarily to validate the accuracy of the documentation (how else can you prove that you have recreated the hardware faithfully?).

What is MESS?

MESS (Multi Emulator Super System) is the sister project of MAME. MESS documents the hardware for a wide variety of (mostly vintage) computers, video game consoles, and calculators, as MAME does for arcade games.

The MESS and MAME projects live in the same source repository and share much of the same code, but are different build targets.

How to compile?

If you're on a *nix system, it could be as easy as typing

make

for a MAME build, or

make TARGET=mess

for a MESS build (provided you have all the prerequisites).

For Windows users, we provide a ready-made build environment based on MinGW-w64. Visual Studio builds are also possible.

Where can I find out more?