In April 2009, the MAME core was undergoing significant internal rewrites. This build likely featured improved abstraction for CD-ROM handling and memory card management, crucial for the PlayStation architecture it was emulating.
It supports OpenGL plugins typically reserved for PSX home console emulators, such as PeteOGL2. This allows for modern graphical enhancements like Shader filters . emucr psxmame 20090417 7z