The PC emulator Bleem! was very popular at the time, you could play PSX games like Driver on your PC even with better graphics than on the official PSX console. The creators soon realized they could write a PSX emulator for the Dreamcast. Some people called them crazy because there wasn’t even a fullspeed Snes emulator at that time. but they told it would be programmed directly on the hardware without using any existing library.
First they tried to create bleempacks that supported 100 games at a time. But the testing was very time consuming, so they abandoned that idea.
They decided to create a release that only supported 1 title. Of course they choose the best games at that time: Gran Turismo 2, Tekken 3 and Metal Gear Solid. At the time i bought the Tekken 3 version and it worked perfect and looked great.
Eventually a beta version of bleemcast was leaked, it would boot alot of games but ran pretty horrible because it was an early beta (30% complete). After testing by the community they found out it supported around 100 games, just like they promised before. But very buggy without saving and choppy movies.
The protection for the offical releases was very good. It took along time to crack it but a russian hacker did it. Later on he also disabled the disc check, so you could boot any psx game even with the offical release. But compatiblity was very poor, most likely because of specific hacks for that 1 game.
If you want to check out bleemcast i would recommend the 3 official releases, they work perfect and even now the graphics are still amazing.