Instead of multiple .bin files cluttering your folder, everything is contained in one .chd file per disc.
If the output shows Romba or Tentacle as the creator? That is an old, bad dump. You want Redump or Trurip standards. Metal Gear Solid -Spain- -Disc 1- -Rev 1-.chd
This is the first half of the main game. In the original PS1 release, you would be prompted to swap to Disc 2 after the battle with Sniper Wolf or during the infiltration of the Communication Tower . Instead of multiple
You need the PlayStation BIOS (e.g., scph5501.bin ). Place it in your emulator's bios folder. Metal Gear Solid -Spain- -Disc 1- -Rev 1-.chd