diff --git a/src/BizHawk.Emulation.Cores/Consoles/Sega/gpgx64/GPGX.IDisassembler.cs b/src/BizHawk.Emulation.Cores/Consoles/Sega/gpgx64/GPGX.IDisassembler.cs
index cdd4aa5b56..acf8505e70 100644
--- a/src/BizHawk.Emulation.Cores/Consoles/Sega/gpgx64/GPGX.IDisassembler.cs
+++ b/src/BizHawk.Emulation.Cores/Consoles/Sega/gpgx64/GPGX.IDisassembler.cs
@@ -15,7 +15,7 @@ namespace BizHawk.Emulation.Cores.Consoles.Sega.gpgx
 			}
 		}
 
-		public string PCRegisterName => "M68K PC";
+		public string PCRegisterName { get; }
 
 		public IEnumerable<string> AvailableCpus { get; } = [ "M68000" ];
 
diff --git a/src/BizHawk.Emulation.Cores/Consoles/Sega/gpgx64/GPGX.cs b/src/BizHawk.Emulation.Cores/Consoles/Sega/gpgx64/GPGX.cs
index 72eef4580b..1f640ec56c 100644
--- a/src/BizHawk.Emulation.Cores/Consoles/Sega/gpgx64/GPGX.cs
+++ b/src/BizHawk.Emulation.Cores/Consoles/Sega/gpgx64/GPGX.cs
@@ -48,6 +48,7 @@ namespace BizHawk.Emulation.Cores.Consoles.Sega.gpgx
 					_ => throw new InvalidOperationException("Invalid system id")
 				};
 			}
+			PCRegisterName = SystemId is VSystemID.Raw.GEN ? "M68K PC" : "Z80 pc";
 
 			// three or six button?
 			// http://www.sega-16.com/forum/showthread.php?4398-Forgotten-Worlds-giving-you-GAME-OVER-immediately-Fix-inside&highlight=forgotten%20worlds