(Emulation CRacks/Collections) is a long-standing website known for hosting "SVN" or "Git" builds. Instead of waiting for official monthly releases, EmuCR provides daily or frequent snapshots of emulators as they are being coded. This particular link from April 17, 2009, would have been a "bleeding edge" version at that time, potentially offering:
pSxMAME 20090417 is a specialized fork of the MAME Plus Plus! arcade emulator released on April 17, 2009. It is designed specifically to improve the emulation of arcade systems that use Sony PlayStation (PSX) hardware , such as the Konami System 573 and Taito G-NET. Key Features and Technical Details Hardware Acceleration: It integrates the emucr psxmame 20090417 7z link
Exploring the EmuCR pSxMAME 20090417 7z Release: A Look Back at PSX Arcade Emulation arcade emulator released on April 17, 2009