M CHANGES → CHANGES

@@ -39,7 +39,7 @@ - GB: Fix flickering when screen is strobed quickly
  - FFmpeg: Fix overflow and general issues with audio encoding
  - Qt: Fix crash when changing audio settings after a game is closed
  - GBA BIOS: Fix ArcTan sign in HLE BIOS
- - GBA BIOS: Fix ArcTan2 sign in HLE BIOS
+ - GBA BIOS: Fix ArcTan2 sign in HLE BIOS (fixes mgba.io/i/689)
 Misc:
  - SDL: Remove scancode key input
  - GBA Video: Clean up unused timers

M src/gba/bios.c → src/gba/bios.c

@@ -359,7 +359,8 @@ case 0x9:
 		cpu->gprs[0] = _ArcTan(cpu->gprs[0]);
 		break;
 	case 0xA:
-		cpu->gprs[0] = _ArcTan2(cpu->gprs[0], cpu->gprs[1]);
+		cpu->gprs[0] = (uint16_t) _ArcTan2(cpu->gprs[0], cpu->gprs[1]);
+		cpu->gprs[3] = 0x170;
 		break;
 	case 0xB:
 	case 0xC: