diff --git a/BizHawk.Emulation.Cores/Calculator/TI83.cs b/BizHawk.Emulation.Cores/Calculator/TI83.cs
index 09b0928449..cfe82f74eb 100644
--- a/BizHawk.Emulation.Cores/Calculator/TI83.cs
+++ b/BizHawk.Emulation.Cores/Calculator/TI83.cs
@@ -23,6 +23,7 @@ namespace BizHawk.Emulation.Cores.Calculators
 			PutSettings((TI83Settings)settings ?? new TI83Settings());
 
 			CoreComm = comm;
+			_cpu.FetchMemory = ReadMemory;
 			_cpu.ReadMemory = ReadMemory;
 			_cpu.WriteMemory = WriteMemory;
 			_cpu.ReadHardware = ReadHardware;
@@ -511,4 +512,4 @@ namespace BizHawk.Emulation.Cores.Calculators
 			_displayX = _displayY = 0;
 		}
 	}
-}
\ No newline at end of file
+}