diff --git a/src/interpreter/computer.rs b/src/interpreter/computer.rs
index 8c1d65b..1295033 100644
--- a/src/interpreter/computer.rs
+++ b/src/interpreter/computer.rs
@@ -260,6 +260,22 @@ impl Computer {
             }
         }
     }
+
+    /// Write an [`ImmediateOperand`] into [`Self::memory`] or [`Self::regs`].
+    pub fn write_modrm(&mut self, target: ModRmTarget, val: ImmediateOperand) {
+        match target {
+            ModRmTarget::Memory(idx) => self.memory.write(&self.regs, idx, val),
+            ModRmTarget::Register(reg) => self.regs.write(reg, val),
+        };
+    }
+
+    /// Read an [`ImmediateOperand`] from [`Self::memory`] or [`Self::regs`].
+    pub fn read_modrm(&self, target: ModRmTarget) -> ImmediateOperand {
+        match target {
+            ModRmTarget::Memory(idx) => self.memory.read(&self.regs, idx),
+            ModRmTarget::Register(reg) => self.regs.read(reg),
+        }
+    }
 }
 
 impl fmt::Display for Computer {
diff --git a/src/interpreter/interpreter.rs b/src/interpreter/interpreter.rs
index 8cd54c4..20a69da 100644
--- a/src/interpreter/interpreter.rs
+++ b/src/interpreter/interpreter.rs
@@ -390,7 +390,39 @@ impl Interpreter {
                 /*
                  * MOV
                  */
-                Mnemonic::MOV_BXIv(word) => self.computer.regs.bx.write(word),
+                Mnemonic::MOV_FromReg(target, reg) => self
+                    .computer
+                    .write_modrm(target, self.computer.regs.read(reg)),
+                Mnemonic::MOV_ToReg(target, reg) => self
+                    .computer
+                    .regs
+                    .write(reg, self.computer.read_modrm(target)),
+                Mnemonic::MOV_FromSReg(_, _) => todo!(),
+                Mnemonic::MOV_ToSReg(_, _) => todo!(),
+                Mnemonic::MOV_Ib(target, val) => self.computer.write_modrm(target, val.into()),
+                Mnemonic::MOV_Iv(target, val) => self.computer.write_modrm(target, val.into()),
+
+                Mnemonic::MOV_AL0b(val) => self.computer.regs.ax.lower = val,
+                Mnemonic::MOV_AX0v(val) => self.computer.regs.ax.write(val),
+                Mnemonic::MOV_0bAL(_) => todo!(),
+                Mnemonic::MOV_0vAX(_) => todo!(),
+
+                Mnemonic::MOV_ALIb(val) => self.computer.regs.ax.lower = val,
+                Mnemonic::MOV_CLIb(val) => self.computer.regs.cx.lower = val,
+                Mnemonic::MOV_DLIb(val) => self.computer.regs.dx.lower = val,
+                Mnemonic::MOV_BLIb(val) => self.computer.regs.bx.lower = val,
+                Mnemonic::MOV_AHIb(val) => self.computer.regs.ax.upper = val,
+                Mnemonic::MOV_CHIb(val) => self.computer.regs.ax.upper = val,
+                Mnemonic::MOV_DHIb(val) => self.computer.regs.ax.upper = val,
+                Mnemonic::MOV_BHIb(val) => self.computer.regs.ax.upper = val,
+                Mnemonic::MOV_AXIv(val) => self.computer.regs.ax.write(val),
+                Mnemonic::MOV_CXIv(val) => self.computer.regs.cx.write(val),
+                Mnemonic::MOV_DXIv(val) => self.computer.regs.dx.write(val),
+                Mnemonic::MOV_BXIv(val) => self.computer.regs.bx.write(val),
+                Mnemonic::MOV_SPIv(val) => self.computer.regs.sp = val,
+                Mnemonic::MOV_BPIv(val) => self.computer.regs.bp = val,
+                Mnemonic::MOV_SIIv(val) => self.computer.regs.si = val,
+                Mnemonic::MOV_DIIv(val) => self.computer.regs.di = val,
 
                 /*
                  * LEA
diff --git a/src/interpreter/register.rs b/src/interpreter/register.rs
index bbd6743..562253c 100644
--- a/src/interpreter/register.rs
+++ b/src/interpreter/register.rs
@@ -50,8 +50,8 @@ impl Register {
     }
 
     /// Write an [`ImmediateOperand`] to a [`crate::register::Register`].
-    pub fn write(&mut self, reg: crate::register::Register, op: ImmediateOperand) {
-        match op {
+    pub fn write(&mut self, reg: crate::register::Register, val: ImmediateOperand) {
+        match val {
             ImmediateOperand::Byte(byte) => match reg {
                 crate::register::Register::AX => self.ax.lower = byte,
                 crate::register::Register::BX => self.bx.lower = byte,
@@ -109,8 +109,8 @@ macro_rules! gen_regs {
     ($ident:ident) => {
         #[derive(Debug, Clone, Copy)]
         pub struct $ident {
-            upper: Byte,
-            lower: Byte,
+            pub upper: Byte,
+            pub lower: Byte,
         }
 
         impl $ident {
diff --git a/src/operands.rs b/src/operands.rs
index 96e8059..4b9b425 100644
--- a/src/operands.rs
+++ b/src/operands.rs
@@ -95,6 +95,18 @@ impl ImmediateOperand {
     }
 }
 
+impl From<Byte> for ImmediateOperand {
+    fn from(value: Byte) -> Self {
+        Self::Byte(value)
+    }
+}
+
+impl From<Word> for ImmediateOperand {
+    fn from(value: Word) -> Self {
+        Self::Word(value)
+    }
+}
+
 impl Into<usize> for ImmediateOperand {
     fn into(self) -> usize {
         match self {