This is the specific model number of the PlayStation 2. The "SCPH-70000" series represents the very first generation of the PS2 Slim, which radically downsized the original "Fat" console design. The final digit, 4 , is Sony's region code for Europe (PAL).
Some versions of PCSX2 require the auxiliary .rom1 and .erom files alongside the .bin file. If the emulator throws an error, re-dump your console using an updated dumper tool to capture all three components. Black Screen on Boot scph-70004 bios v12 eur 200.bin