diff --git a/src/disasm.rs b/src/disasm.rs
index ce10b0c..f746a0c 100644
--- a/src/disasm.rs
+++ b/src/disasm.rs
@@ -586,8 +586,15 @@ impl Disassembler {
 
                 0xC8..=0xC9 => return Err(DisasmError::OpcodeUndefined(opcode)),
 
+                0xCA => Mnemonic::RETF_Iw(self.parse_word()),
+                0xCB => Mnemonic::RETF,
+
+                0xCC => Mnemonic::INT(3),
                 0xCD => Mnemonic::INT(self.parse_byte()),
 
+                0xCE => Mnemonic::INTO,
+                0xCF => Mnemonic::IRET,
+
                 // Group 2
                 0xD0 => {
                     let (target, reg) = self.parse_modrm_byte(Operand::Byte(0));
@@ -606,6 +613,15 @@ impl Disassembler {
                     Self::modrm_reg_to_grp2_cl(reg, target)
                 }
 
+                0xD4 => Mnemonic::AAM(self.parse_byte()),
+                0xD5 => Mnemonic::AAD(self.parse_byte()),
+
+                0xD6 => return Err(DisasmError::OpcodeUndefined(opcode)),
+
+                0xD7 => Mnemonic::XLAT,
+
+                0xD8..=0xDF => return Err(DisasmError::OpcodeUndefined(opcode)),
+
                 0xE0 => Mnemonic::LOOPNZ(self.parse_byte() as IByte),
                 0xE1 => Mnemonic::LOOPZ(self.parse_byte() as IByte),
                 0xE2 => Mnemonic::LOOP(self.parse_byte() as IByte),
@@ -631,11 +647,15 @@ impl Disassembler {
                 0xEE => Mnemonic::OUT_ALDX,
                 0xEF => Mnemonic::OUT_AXDX,
 
+                0xF1 => return Err(DisasmError::OpcodeUndefined(opcode)),
+
                 0xF2 => Mnemonic::REPNZ,
                 0xF3 => Mnemonic::REPZ,
 
                 0xF4 => Mnemonic::HLT,
 
+                0xF5 => Mnemonic::CMC,
+
                 // Group 3
                 0xF6 => {
                     let (target, reg) = self.parse_modrm_byte(Operand::Word(0));
diff --git a/src/instructions.rs b/src/instructions.rs
index 5321ee0..5cfcdf4 100644
--- a/src/instructions.rs
+++ b/src/instructions.rs
@@ -259,6 +259,9 @@ pub enum Mnemonic {
     // RET
     RETIw(Word),
     RET,
+    RETF_Iw(Word),
+    RETF,
+    IRET,
     // Load ES/DS Register
     LES(ModRmTarget),
     LDS(ModRmTarget),
@@ -301,6 +304,7 @@ pub enum Mnemonic {
     OUT_AXDX,
     // INT
     INT(Byte),
+    INTO,
     // Flag Manipulation
     CLC,
     STC,
@@ -308,9 +312,15 @@ pub enum Mnemonic {
     STI,
     CLD,
     STD,
+    CMC,
     // Repeat prefix
     REPNZ,
     REPZ,
+    // Adjust
+    AAM(Byte),
+    AAD(Byte),
+    // MISC
+    XLAT,
 }
 
 impl fmt::Display for Mnemonic {