Need Help about Dreamshell without GD ROM

[pstationBG]

Thank you very much for your answers guys .
Ok then I will use that , will test and will write here again about results .
About loading from SD card , don't know why I have so many problems with it ...
I've downloaded some games from theisozone and only 3 of them are working for me .
Those games are not working , freeze at "Executing" or pass it and I can see only black screen .
Sonic Adventure SD-ISO
KOFDreamMatch SD- ISO
Crazy Taxy PAL
Resident Evil CD1 and CD2 > DS_error Can't moun't /sd/ISO/REcd1.cdi to isoldr
Re Volt CD1
Thanks to megavolt85's new BIOS it is not freezing after that ( normaly with other BIOSes Dreamcast just refuses to see SD card ... need to leave it for about 20-30 minutes with unplugged cables to work again)
THANK YOU again megavolt85 for this BIOS
Working games for me so far :
Crazy Taxy 2
Mortal Kombat Gold
Streetfighter Alpha
Usually problems with them are bad or no sound , slow speed and sometimes crashes and freeze.
All tests has been made with the GD ROM .
I can't make them work that smooth like you done this SWAT in this video , speed in game is just AMAZING
https://www.youtube.com/watch?v=1u8UBSEabdY
If it is not a problem can you share with me your configuration SWAT ,like stock SD adapter or home made , what type of SD Card you are using , what file system ( FAt32, ExFat...) , what BIOS on MX chip ,I saw and that you have and HDD
Sorry for those too many questions , they are like "noob"questions for you , but I've read all forum and tested many things before posting something here.
Thanks again .