diff --git a/src/BizHawk.Emulation.Cores/Consoles/Sega/gpgx64/GPGX.IEmulator.cs b/src/BizHawk.Emulation.Cores/Consoles/Sega/gpgx64/GPGX.IEmulator.cs
index 753a1026ed..31245af3fd 100644
--- a/src/BizHawk.Emulation.Cores/Consoles/Sega/gpgx64/GPGX.IEmulator.cs
+++ b/src/BizHawk.Emulation.Cores/Consoles/Sega/gpgx64/GPGX.IEmulator.cs
@@ -22,6 +22,8 @@ namespace BizHawk.Emulation.Cores.Consoles.Sega.gpgx
 
 			if (_cds != null)
 			{
+				Console.WriteLine("======= GPGX.FrameAdvance");
+				Console.WriteLine($"was: |{_discIndex}|{(_prevDiskPressed ? 'P' : '.')}{(_nextDiskPressed ? 'N' : '.')}|");
 				var prev = controller.IsPressed("Previous Disk");
 				var next = controller.IsPressed("Next Disk");
 				var newDisk = _discIndex;
@@ -53,6 +55,7 @@ namespace BizHawk.Emulation.Cores.Consoles.Sega.gpgx
 					_discIndex = newDisk;
 					Core.gpgx_swap_disc(_discIndex == -1 ? null : GetCDDataStruct(_cds[_discIndex]));
 				}
+				Console.WriteLine($"now: |{_discIndex}|{(_prevDiskPressed ? 'P' : '.')}{(_nextDiskPressed ? 'N' : '.')}|");
 			}
 
 			// this shouldn't be needed, as nothing has changed