diff --git a/src/emu/cpu/mc68hc11/hc11ops.c b/src/emu/cpu/mc68hc11/hc11ops.c
index 320231a52c2..d67825c1360 100644
--- a/src/emu/cpu/mc68hc11/hc11ops.c
+++ b/src/emu/cpu/mc68hc11/hc11ops.c
@@ -2202,6 +2202,33 @@ static void HC11OP(tst_indy)(hc11_state *cpustate)
 	CYCLES(cpustate, 6);
 }
 
+/* TSX              0x30 */
+static void HC11OP(tsx)(hc11_state *cpustate)
+{
+	cpustate->ix = cpustate->sp + 1;
+	CYCLES(cpustate, 3);
+}
+
+/* TSY              0x18 0x30 */
+static void HC11OP(tsy)(hc11_state *cpustate)
+{
+	cpustate->iy = cpustate->sp + 1;
+	CYCLES(cpustate, 4);
+}
+
+/* TXS              0x35 */
+static void HC11OP(txs)(hc11_state *cpustate)
+{
+	cpustate->sp = cpustate->ix - 1;
+	CYCLES(cpustate, 3);
+}
+
+/* TYS              0x18 0x35 */
+static void HC11OP(tys)(hc11_state *cpustate)
+{
+	cpustate->sp = cpustate->iy - 1;
+	CYCLES(cpustate, 4);
+}
 
 /* XGDX             0x8F */
 static void HC11OP(xgdx)(hc11_state *cpustate)
diff --git a/src/emu/cpu/mc68hc11/hc11ops.h b/src/emu/cpu/mc68hc11/hc11ops.h
index ef871578e06..c6c88ff3238 100644
--- a/src/emu/cpu/mc68hc11/hc11ops.h
+++ b/src/emu/cpu/mc68hc11/hc11ops.h
@@ -187,6 +187,10 @@ static const hc11_opcode_list_struct hc11_opcode_list[] =
 	{	0,		0x7d,			HC11OP(tst_ext)				},
 	{	0,		0x6d,			HC11OP(tst_indx)			},
 	{	0x18,	0x6d,			HC11OP(tst_indy)			},
+	{	0,		0x30,			HC11OP(tsx)					},
+	{	0x18,	0x30,			HC11OP(tsy)					},
+	{	0,		0x35,			HC11OP(txs)					},
+	{	0x18,	0x35,			HC11OP(tys)					},
 	{	0,		0x8f,			HC11OP(xgdx)				},
 	{	0x18,	0x8f,			HC11OP(xgdy)				},