That would mean learning to unpack rip all the files of a game rebuilding the game using tools not every game you could downsample etc.. Here is a collection for the sd card and dreamshell were this has been done
https://archive.org/details/dreamcastdr ... 5gb.7z.001Propeller_Arena
Phantasy_Star_Online
Aqua_GT
Dino_Crisis
Sega_GT
Spider-Man
Snow_Surfers
Unreal_Tournament
UEFA_Striker
Tokyo_Highway_Challenge
Star_Wars_Jedi_Power_Battles
Star_Wars_Episode_I_Racer
MARVEL_VS_CAPCOM_2
SPAWN
Virtua_Tennis
STREET_FIGHTER_3
PowerStone2
MEGADRIVE
KOF97
HEAVY_METAL
GigaWing
Death_Crimson
Zombie_Revenge
SILENT_SCOPE
PROJECT_JUSTICE
Fighting_Vipers_2
suzuki
quake3
JETRADIO
DEAD_OR_ALIVE_2
102_DALMATIANS
Sonic_Adventure_2
Sonic_Adventure
Skies_Of_Arcadia_GD2
Skies_Of_Arcadia_GD1
Shenmue_1_GD_4
Shenmue_1_GD_3
Shenmue_1_GD_2
Shenmue_1_GD_1
Resident_Evil_Code_Veronica_GD2
Resident_Evil_Code_Veronica_GD1
Record_of_Lodoss_War
Head_Hunter_GD2
Head_Hunter_GD1
Grandia_2
Flag_to_Flag
Evolution_The_World_of_Sacred_Device
Evil_Twin
Elemental_Gimmick_Gear
ECCO_the_Dolphin
Daytona_USA
Crazy_Taxi_II
Crazy_Taxi
ChuChu_Rocket
Capcom_vs_SNK_2
Capcom_vs_SNK
Cannon_Spike
Bomberman_Online
Blue_Stinger