diff --git a/src/emu/cpu/upd7810/7810ops.c b/src/emu/cpu/upd7810/7810ops.c
index 7c8dd831e63..e645819ac89 100644
--- a/src/emu/cpu/upd7810/7810ops.c
+++ b/src/emu/cpu/upd7810/7810ops.c
@@ -9468,3 +9468,19 @@ static void STM_7801(upd7810_state *cpustate)
 	/* Reload the timer */
 	cpustate->ovc0 = 16 * ( TM0 + ( ( TM1 & 0x0f ) << 8 ) );
 }
+
+static void MOV_MC_A_7801(upd7810_state *cpustate)
+{
+	/* On the 7801 the mode C bits function as follows: */
+	/*       Cn=1   Cn=0         */
+	/* PC0  Input   Output       */
+	/* PC1  Input   Output       */
+	/* PC2  Input   -SCS Input   */
+	/* PC3  Output  SAK Output   */
+	/* PC4  Output  To Output    */
+	/* PC5  Output  IO/-M Output */
+	/* PC6  Output  HLDA Output  */
+	/* PC7  Input   HOLD Input   */
+	MC = 0x84 | ( ( A & 0x02 ) ? 0x02 : 0x00 ) | ( ( A & 0x01 ) ? 0x01 : 0x00 );
+}
+
diff --git a/src/emu/cpu/upd7810/7810tbl.c b/src/emu/cpu/upd7810/7810tbl.c
index 8e025d3788b..fd3cc4f0af3 100644
--- a/src/emu/cpu/upd7810/7810tbl.c
+++ b/src/emu/cpu/upd7810/7810tbl.c
@@ -1044,6 +1044,7 @@ static void INR_B_7801(upd7810_state *cpustate);
 static void INR_C_7801(upd7810_state *cpustate);
 static void INRW_wa_7801(upd7810_state *cpustate);
 static void STM_7801(upd7810_state *cpustate);
+static void MOV_MC_A_7801(upd7810_state *cpustate);
 
 
 static const struct opcode_s op48[256] =
@@ -3970,7 +3971,7 @@ static const struct opcode_s op4D_7801[256] =
 	/* 0xC0 - 0xDF */
 	{MOV_PA_A,		2,10,10,L0|L1},	{MOV_PB_A,		2,10,10,L0|L1},
 	{MOV_PC_A,		2,10,10,L0|L1},	{MOV_MKL_A,		2,10,10,L0|L1},
-	{MOV_MB_A,		2,10,10,L0|L1},	{MOV_MC_A,		2,10,10,L0|L1},
+	{MOV_MB_A,		2,10,10,L0|L1},	{MOV_MC_A_7801,	2,10,10,L0|L1},
 	{MOV_TM0_A, 	2,10,10,L0|L1},	{MOV_TM1_A, 	2,10,10,L0|L1},
 	{MOV_S_A,		2,10,10,L0|L1},	{illegal2,		2, 8, 8,L0|L1},
 	{illegal2,		2, 8, 8,L0|L1},	{illegal2,		2, 8, 8,L0|L1},