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mame2003-plus is built on the same codebase as MAME 0.78, meaning that 95% or more of MAME 0.78 romsets from MAME 0.78 will work as-is in mame2003-plus where they benefit from bugfixes and other improvements. In order to play the new games and games which received ROM updates in mame2003-plus, you will need to find or build the correct romsets.
Each version of an arcade emulator must be used with ROMs that have the same exact version number. For example, MAME 0.37b5 romsets are required by the MAME 2000 emulator, but MAME 0.37b5 sets will not work correctly with the MAME 2003 or MAME 2010 emulator cores. Those cores require MAME 0.78 and MAME 0.139 ROM sets, respectively.
What is a romset? Arcade games are packaged as zip files, most of which are composed of more than one individual 'ROM' files. That is why some resources refer to an individual arcade game as a ROM (like people use to describe a zipped game cartridge ROM) while other resources refer to an individual game as a ROM set, ROMset, or romset.
DAT files describe the exact ROM contents that the emultaor needs including filenames, file sizes, and checksums to verify contents are not incorrect or corrupt. mame2003-plus has the ability to generate an XML "DAT" file from the MAME Menu. When mame_keyboard input is enabled, you can enter the MAME menu by pressing the Tab key. With any input mode, you can also access the MAME menu by turning it on as a core option.
TBD
The modern layout sets mame2003-plus to the same input configration as Final Burn Alpha (FBA). This layout is the fight stick & pad layout popularized by Street Fighter IV and assumes an 8+ button controller.
The SNES layout strives to map arcade games to match their Super Nintendo / Super Famicom ports when possible. When there is no SNES port as a reference, the SNES layout aims to set sensible defaults with that controller layout in mind. The SNES layout only needs a 6+ button controller by default and is not intended for 8+ button fight sticks.
The MAME Classic input mode uses mainline MAME's default Xbox 360 controller layout. This layout is not a good match for 6-button fighters, but may suit other games.
mame_keyboard sets the core to process keyboard input directly through the legacy "MAME" keyboard interface. Use this input mode only if your input device is seen as a keyboard, including some arcade control panel hardware.
In mame2003-plus, the MAME menu can be accessed via "retropad" users by activating it in the core options. If your input mode is set to allow input to the mame_keyboard interface, you can also enter the menu by pressing the Tab key.
The libretro_log_level setting in retroarch.conf needs to be changed to to retroarch.conf to activate the logging system for testing and troubleshooting. Set the log level to 0 for "Debug" logs.
libretro_log_level = 0
#programming channel of the libretro discord chat server: https://discordapp.com/invite/C4amCeV