That "saturn boot disk" very likely doesn't do what the name implies.
The DC isn't backwards-compatible, and it's lacking the horsepower to emulate the Saturn.
BTW, last I checked, the PS1 version of DYRL was on one of the iMacross servers.
And in a quite rare event for a sprite/tile game, the PS1 version is supposed to be better, as they added some diffuiculty from the Saturn version(which was supposed to be something of a pushover).
...
Though it shouldn't be run in ePSXe. PSXeven is better for that game, as there's a bug in ePSXe that makes the game unbeatable(one boss refuses to enter).
It refuses to enter on PSXeven too, but dropping a bomb knocks some sense into the emulator.