diff --git a/src/cpu.rs b/src/cpu.rs
index 45fe5ed..56eb4fb 100644
--- a/src/cpu.rs
+++ b/src/cpu.rs
@@ -471,11 +471,47 @@ impl<M: Bus, V: Variant> CPU<M, V> {
                 let val = self.registers.accumulator;
                 self.push_on_stack(val);
             }
+            (Instruction::PHX, OpInput::UseImplied) => {
+                // Push X
+                self.push_on_stack(self.registers.index_x);
+            }
+            (Instruction::PHY, OpInput::UseImplied) => {
+                // Push Y
+                self.push_on_stack(self.registers.index_y);
+            }
             (Instruction::PHP, OpInput::UseImplied) => {
                 // Push status
                 let val = self.registers.status.bits() | 0x30;
                 self.push_on_stack(val);
             }
+            (Instruction::PLX, OpInput::UseImplied) => {
+                // Pull accumulator
+                self.pull_from_stack();
+                let val: u8 = self.fetch_from_stack();
+                self.registers.index_x = val;
+                self.registers.status.set_with_mask(
+                    Status::PS_ZERO | Status::PS_NEGATIVE,
+                    Status::new(StatusArgs {
+                        zero: val == 0,
+                        negative: self.registers.accumulator > 127,
+                        ..StatusArgs::none()
+                    }),
+                );
+            }
+            (Instruction::PLY, OpInput::UseImplied) => {
+                // Pull accumulator
+                self.pull_from_stack();
+                let val: u8 = self.fetch_from_stack();
+                self.registers.index_y = val;
+                self.registers.status.set_with_mask(
+                    Status::PS_ZERO | Status::PS_NEGATIVE,
+                    Status::new(StatusArgs {
+                        zero: val == 0,
+                        negative: self.registers.accumulator > 127,
+                        ..StatusArgs::none()
+                    }),
+                );
+            }
             (Instruction::PLA, OpInput::UseImplied) => {
                 // Pull accumulator
                 self.pull_from_stack();
diff --git a/src/instruction.rs b/src/instruction.rs
index 8854154..3b97477 100644
--- a/src/instruction.rs
+++ b/src/instruction.rs
@@ -83,8 +83,12 @@ pub enum Instruction {
     NOP, // No OPeration.................. | .. .....              =
     ORA, // inclusive OR (bitwise)........ | N. ...Z. A            = A | M
     PHA, // PusH Accumulator.............. | .. .....       S    M = A
+    PHX, // PusH X........................ | .. .....       S    M = A
+    PHY, // PusH Y........................ | .. .....       S    M = A
     PHP, // PusH Processor status......... | .. .....       S    M = F
     PLA, // PuLl Accumulator.............. | N. ...Z. A     S      = M (stack)
+    PLX, // PuLl X........................ | N. ...Z. A     S      = M (stack)
+    PLY, // PuLl Y........................ | N. ...Z. A     S      = M (stack)
     PLP, // PuLl Processor status......... | NV BDIZC       S      = M (stack)
     ROL, // ROtate Left................... | N. ...ZC A            = C A rotated
     //                               or N. ...ZC            M = C M rotated
@@ -499,6 +503,10 @@ impl crate::Variant for Cmos6502 {
             0x74 => Some((Instruction::STZ, AddressingMode::ZeroPageX)),
             0x9c => Some((Instruction::STZ, AddressingMode::Absolute)),
             0x9e => Some((Instruction::STZ, AddressingMode::AbsoluteX)),
+            0x7a => Some((Instruction::PLY, AddressingMode::Implied)),
+            0xfa => Some((Instruction::PLX, AddressingMode::Implied)),
+            0x5a => Some((Instruction::PHY, AddressingMode::Implied)),
+            0xda => Some((Instruction::PHX, AddressingMode::Implied)),
             _ => Nmos6502::decode(opcode),
         }
     }