diff --git a/src/devices/cpu/patinhofeio/patinho_feio.cpp b/src/devices/cpu/patinhofeio/patinho_feio.cpp
index 595a62db6b6..f8a1e3c54c5 100644
--- a/src/devices/cpu/patinhofeio/patinho_feio.cpp
+++ b/src/devices/cpu/patinhofeio/patinho_feio.cpp
@@ -121,6 +121,25 @@ void patinho_feio_cpu_device::execute_instruction()
         m_scheduled_IND_bit_reset = true;
 
     switch (opcode){
+        case 0xD2:
+            //XOR: Computes the bitwise XOR of an immediate into the accumulator
+            ACC ^= READ_BYTE_PATINHO(PC);
+            INCREMENT_PC_4K;
+            //TODO: update T and V flags
+            return;
+        case 0xD4:
+            //NAND: Computes the bitwise XOR of an immediate into the accumulator
+            ACC = ~(ACC & READ_BYTE_PATINHO(PC));
+            INCREMENT_PC_4K;
+            //TODO: update T and V flags
+            return;
+        case 0xD8:
+            //SOMI="Soma Imediato":
+            //     Add an immediate into the accumulator
+            ACC += READ_BYTE_PATINHO(PC);
+            INCREMENT_PC_4K;
+            //TODO: update T and V flags
+            return;
         case 0xDA:
             //CARI="Carrega Imediato":
             //     Load an immediate into the accumulator
diff --git a/src/devices/cpu/patinhofeio/patinho_feio_dasm.cpp b/src/devices/cpu/patinhofeio/patinho_feio_dasm.cpp
index cb5aa8e0c2a..15414347179 100644
--- a/src/devices/cpu/patinhofeio/patinho_feio_dasm.cpp
+++ b/src/devices/cpu/patinhofeio/patinho_feio_dasm.cpp
@@ -128,10 +128,10 @@ CPU_DISASSEMBLE( patinho_feio )
                         case 0x80: sprintf (buffer, "DDS     /%01X", value); return 2; //DDS = "Deslocamento para a direita com duplicacao de sinal": Shift right with sign duplication
                     }
                     break;
-                case 0x02: sprintf (buffer, "XOR     /%02X", value); return 2; //Logical XOR
-                case 0x04: sprintf (buffer, "NAND    /%02X", value); return 2; //Logical NAND
-                case 0x08: sprintf (buffer, "SOMI    /%02X", value); return 2; //SOMI = "Soma imediata": Add immediate value into accumulator
-                case 0x0A: sprintf (buffer, "CARI    /%02X", value); return 2; //CARI = "Carrega imediato": Loads an immediate value into the accumulator
+                case 0x02: sprintf (buffer, "XOR     /%02X", oprom[1]); return 2; //Logical XOR
+                case 0x04: sprintf (buffer, "NAND    /%02X", oprom[1]); return 2; //Logical NAND
+                case 0x08: sprintf (buffer, "SOMI    /%02X", oprom[1]); return 2; //SOMI = "Soma imediata": Add immediate value into accumulator
+                case 0x0A: sprintf (buffer, "CARI    /%02X", oprom[1]); return 2; //CARI = "Carrega imediato": Loads an immediate value into the accumulator
             }
             break;
         case 0xE0: