atari PALM and NTSC Roms - How to set the proper BIOS?

[Jefsola]

Good morning guys,

Im facing the following problem:

In atari 2600 i have NTSC and PAL rooms. This rooms can both run in NTSC and PAL Bios, but, if you open a PAL room on the NTSC bios, the image is cut and the color are different (yeah, i know, its strange).

The big questions now is, how can i have, only one Atari 2600 Wheel, with all games (PAL and NTSC), and configure my system to decide when to use this or the other BIOS??

If you guys have any alternative solution, that also helps a lot.

 

Have a nice weekend,