Playing the original SLUS release on Hard is a masterclass in resource management. Unlike its sequels, where you could fly across the screen, DMC1 is clunky by modern standards. There is no "lock-on dodge" in the modern sense. You have to use the i-frames of the Grenade Roll or the Stinger cancel. The ISO forces you to play chess with demons. The infamous enemy (the black panther that shifts into a liquid 2D puddle) is a logic puzzle disguised as a boss fight. You cannot brute force Shadow; you must wait for its red core to glow, then parry or shoot.
If you rip the audio from this ISO, you will find something strange: Silence. DEVIL MAY CRY 1 - PS2 - SLUS ISO
Yes. Install Free McBoot (FMCB) on a memory card, then use Open PS2 Loader (OPL) to load the ISO from USB or internal HDD. Note: USB 1.1 speed on PS2 causes FMV stutter; HDD is best. Playing the original SLUS release on Hard is