Questions about PAL/NTSC compatibility in Amiga games

[rkauer]

 This is valid only for A500 with version over 5.

 For other Amigas, there is just a resistor (zero Ohm) in the pin 41 of Agnus (A2000 & 3000) or the equivalent Alice in AGA Amigas (same pin, BTW).

 For NTSC operation, this pin must be wired to Vcc via a 10000 Ohms resistor. For PAL, wire it to ground directly.

[rkauer]

 There is not a real problem running NTSC games on PAL Amigas (the minor drawback is the game will play a bit slowly, but I call it a good feature, since you can beat the machine more easily :-D).

 The NTSC screens are 320x200, PAL is 320x256, so any NTSC will play, maybe with a black border under it. The other situation is the problem: you can't "fit" a 256 lines screen in a 200 lines resolution, so this is why PAL games don't work on NTSC machines.