diff --git a/src/processor.rs b/src/processor.rs
index 92da6a4..7a62b87 100644
--- a/src/processor.rs
+++ b/src/processor.rs
@@ -1,3 +1,5 @@
+use std::ops::{BitAnd, BitOr, BitXor};
+
 use crate::{Inner, Memory, Register, State};
 
 #[allow(dead_code)]
@@ -16,6 +18,7 @@ pub struct CPU {
 impl CPU {
     pub fn exec_next(&mut self) -> u8 {
         let opcode = self.next_opcode();
+        unsafe { println!("exec {:#4X} from {:#4X}", opcode, self.state.pc.as_u16 - 1) };
         match opcode {
             0x0 => {
                 // noop
@@ -25,9 +28,13 @@ impl CPU {
                 let address = self.state.bc.as_u16;
                 self.memory.set(address, self.state.af.as_u8s.left);
             },
-            0x03 => unsafe { self.state.bc.as_u16 += 1 },
-            0x04 => unsafe { self.state.bc.as_u8s.left += 1 },
-            0x05 => unsafe { self.state.bc.as_u8s.left -= 1 },
+            0x03 => unsafe { self.state.bc.as_u16 = self.state.bc.as_u16.wrapping_add(1) },
+            0x04 => unsafe {
+                self.state.bc.as_u8s.left = self.state.bc.as_u8s.left.wrapping_add(1)
+            },
+            0x05 => unsafe {
+                self.state.bc.as_u8s.left = self.state.bc.as_u8s.left.wrapping_sub(1)
+            },
             0x06 => self.state.bc.as_u8s.left = self.ld_immediate_byte(),
             0x07 => panic!("RCLA instruction: 0x07"),
             0x08 => unsafe {
@@ -35,11 +42,17 @@ impl CPU {
                 let word = self.state.sp;
                 self.store_word(address, word);
             },
-            0x09 => unsafe { self.state.hl.as_u16 += self.state.bc.as_u16 },
+            0x09 => unsafe {
+                self.state.hl.as_u16 = self.state.hl.as_u16.wrapping_add(self.state.bc.as_u16)
+            },
             0x0A => unsafe { self.state.af.as_u8s.left = self.memory.get(self.state.bc.as_u16) },
-            0x0B => unsafe { self.state.bc.as_u16 -= 0x1 },
-            0x0C => unsafe { self.state.bc.as_u8s.right += 0x1 },
-            0x0D => unsafe { self.state.bc.as_u8s.right -= 0x1 },
+            0x0B => unsafe { self.state.bc.as_u16 = self.state.bc.as_u16.wrapping_sub(0x1) },
+            0x0C => unsafe {
+                self.state.bc.as_u8s.right = self.state.bc.as_u8s.right.wrapping_add(0x1)
+            },
+            0x0D => unsafe {
+                self.state.bc.as_u8s.right = self.state.bc.as_u8s.right.wrapping_sub(0x1)
+            },
             0x0E => self.state.bc.as_u8s.right = self.ld_immediate_byte(),
             0x0F => panic!("RRCA instruction: 0x0F"),
             0x10 => panic!("STOP instruction"),
@@ -49,65 +62,95 @@ impl CPU {
                 let data = self.state.af.as_u8s.left;
                 self.memory.set(address, data);
             },
-            0x13 => unsafe { self.state.de.as_u16 -= 0x1 },
-            0x14 => unsafe { self.state.de.as_u8s.left += 0x1 },
-            0x15 => unsafe { self.state.de.as_u8s.left -= 0x1 },
+            0x13 => unsafe { self.state.de.as_u16 = self.state.de.as_u16.wrapping_sub(0x1) },
+            0x14 => unsafe {
+                self.state.de.as_u8s.left = self.state.de.as_u8s.left.wrapping_add(0x1)
+            },
+            0x15 => unsafe {
+                self.state.de.as_u8s.left = self.state.de.as_u8s.left.wrapping_sub(0x1)
+            },
             0x16 => self.state.de.as_u8s.left = self.ld_immediate_byte(),
             0x17 => panic!("RLA instruction: 0x17"),
-            0x18 => unsafe { self.state.pc.as_u16 += self.ld_immediate_byte() as u16 },
-            0x19 => unsafe { self.state.hl.as_u16 += self.state.de.as_u16 },
+            0x18 => unsafe {
+                self.state.pc.as_u16 = self
+                    .state
+                    .pc
+                    .as_u16
+                    .wrapping_add(self.ld_immediate_byte() as u16)
+            },
+            0x19 => unsafe {
+                self.state.hl.as_u16 = self.state.hl.as_u16.wrapping_add(self.state.de.as_u16)
+            },
             0x1A => unsafe { self.state.af.as_u8s.left = self.memory.get(self.state.de.as_u16) },
-            0x1B => unsafe { self.state.de.as_u16 -= 1 },
-            0x1C => unsafe { self.state.de.as_u8s.right += 1 },
-            0x1D => unsafe { self.state.de.as_u8s.right -= 1 },
+            0x1B => unsafe { self.state.de.as_u16 = self.state.de.as_u16.wrapping_sub(1) },
+            0x1C => unsafe {
+                self.state.de.as_u8s.right = self.state.de.as_u8s.right.wrapping_add(1)
+            },
+            0x1D => unsafe {
+                self.state.de.as_u8s.right = self.state.de.as_u8s.right.wrapping_sub(1)
+            },
             0x1E => self.state.de.as_u8s.right = self.ld_immediate_byte(),
             0x1F => panic!("RRA instruction: 0x1F"),
             0x20 => {
                 let jump_size = self.ld_immediate_byte();
                 if self.get_flag(FLAGS::Z) == 0 {
-                    unsafe { self.state.pc.as_u16 += jump_size as u16 }
+                    unsafe {
+                        self.state.pc.as_u16 = self.state.pc.as_u16.wrapping_add(jump_size as u16)
+                    }
                 }
             }
             0x21 => self.state.hl = self.ld_immediate_word(),
             0x22 => unsafe {
                 self.memory
                     .set(self.state.hl.as_u16, self.state.af.as_u8s.left);
-                self.state.hl.as_u16 += 1;
+                self.state.hl.as_u16 = self.state.hl.as_u16.wrapping_add(1);
+            },
+            0x23 => unsafe { self.state.hl.as_u16 = self.state.hl.as_u16.wrapping_add(1) },
+            0x24 => unsafe {
+                self.state.hl.as_u8s.left = self.state.hl.as_u8s.left.wrapping_add(1)
+            },
+            0x25 => unsafe {
+                self.state.hl.as_u8s.left = self.state.hl.as_u8s.left.wrapping_sub(1)
             },
-            0x23 => unsafe { self.state.hl.as_u16 += 1 },
-            0x24 => unsafe { self.state.hl.as_u8s.left += 1 },
-            0x25 => unsafe { self.state.hl.as_u8s.left -= 1 },
             0x26 => self.state.hl.as_u8s.left = self.ld_immediate_byte(),
             0x27 => panic!("DAA instruction: 0x27"),
             0x28 => {
                 let jump_size = self.ld_immediate_byte();
                 if self.get_flag(FLAGS::Z) == 1 {
-                    unsafe { self.state.pc.as_u16 += jump_size as u16 }
+                    unsafe {
+                        self.state.pc.as_u16 = self.state.pc.as_u16.wrapping_add(jump_size as u16)
+                    }
                 }
             }
             0x29 => unsafe { self.state.hl.as_u16 *= 2 },
             0x2A => unsafe {
                 self.state.af.as_u8s.left = self.memory.get(self.state.hl.as_u16);
-                self.state.hl.as_u16 += 1;
+                self.state.hl.as_u16 = self.state.hl.as_u16.wrapping_add(1);
+            },
+            0x2B => unsafe { self.state.hl.as_u16 = self.state.hl.as_u16.wrapping_sub(1) },
+            0x2C => unsafe {
+                self.state.hl.as_u8s.right = self.state.hl.as_u8s.right.wrapping_add(1)
+            },
+            0x2D => unsafe {
+                self.state.hl.as_u8s.right = self.state.hl.as_u8s.right.wrapping_sub(1)
             },
-            0x2B => unsafe { self.state.hl.as_u16 -= 1 },
-            0x2C => unsafe { self.state.hl.as_u8s.right += 1 },
-            0x2D => unsafe { self.state.hl.as_u8s.right -= 1 },
             0x2E => self.state.hl.as_u8s.right = self.ld_immediate_byte(),
             0x2F => unsafe { self.state.af.as_u8s.left = !self.state.af.as_u8s.left },
             0x30 => {
                 let jump_size = self.ld_immediate_byte();
                 if self.get_flag(FLAGS::C) == 0 {
-                    unsafe { self.state.pc.as_u16 += jump_size as u16 }
+                    unsafe {
+                        self.state.pc.as_u16 = self.state.pc.as_u16.wrapping_add(jump_size as u16)
+                    }
                 }
             }
             0x31 => self.state.sp = self.ld_immediate_word(),
             0x32 => unsafe {
                 self.memory
                     .set(self.state.hl.as_u16, self.state.af.as_u8s.left);
-                self.state.hl.as_u16 -= 1;
+                self.state.hl.as_u16 = self.state.hl.as_u16.wrapping_sub(1);
             },
-            0x33 => unsafe { self.state.sp.as_u16 += 1 },
+            0x33 => unsafe { self.state.sp.as_u16 = self.state.sp.as_u16.wrapping_add(1) },
             0x34 => unsafe {
                 let address = self.state.hl.as_u16;
                 let data = self.memory.get(address) + 1;
@@ -122,46 +165,586 @@ impl CPU {
                 let data = self.ld_immediate_byte();
                 self.memory.set(self.state.hl.as_u16, data);
             },
-            0x37 => panic!("SCF instruction: 0x37 - set carry flag"),
+            0x37 => self.set_flag(FLAGS::C),
             0x38 => {
                 let jump_size = self.ld_immediate_byte();
                 if self.get_flag(FLAGS::C) == 1 {
-                    unsafe { self.state.pc.as_u16 += jump_size as u16 }
+                    unsafe {
+                        self.state.pc.as_u16 = self.state.pc.as_u16.wrapping_add(jump_size as u16)
+                    }
                 }
             }
-            0x39 => unsafe { self.state.hl.as_u16 += self.state.sp.as_u16 },
+            0x39 => unsafe {
+                self.state.hl.as_u16 = self.state.hl.as_u16.wrapping_add(self.state.sp.as_u16)
+            },
             0x3A => unsafe {
                 self.state.af.as_u8s.left = self.memory.get(self.state.hl.as_u16);
-                self.state.hl.as_u16 -= 1;
+                self.state.hl.as_u16 = self.state.hl.as_u16.wrapping_sub(1);
+            },
+            0x3B => unsafe { self.state.sp.as_u16 = self.state.sp.as_u16.wrapping_sub(1) },
+            0x3C => unsafe {
+                self.state.af.as_u8s.left = self.state.af.as_u8s.left.wrapping_add(1)
+            },
+            0x3D => unsafe {
+                self.state.af.as_u8s.left = self.state.af.as_u8s.left.wrapping_sub(1)
             },
-            0x3B => unsafe { self.state.sp.as_u16 -= 1 },
-            0x3C => unsafe { self.state.af.as_u8s.left += 1 },
-            0x3D => unsafe { self.state.af.as_u8s.left -= 1 },
             0x3E => self.state.af.as_u8s.left = self.ld_immediate_byte(),
-            0x3F => panic!("CCF instruction: 0x3F - flip carry flag"),
-            0x4A => {
-                unsafe {
-                    self.state.bc.as_u8s.right = self.state.de.as_u8s.left;
-                };
-            }
-            0x4B => {
-                unsafe {
-                    self.state.bc.as_u8s.right = self.state.de.as_u8s.right;
-                };
-            }
-            0x53 => {
-                unsafe {
-                    self.state.de.as_u8s.left = self.state.de.as_u8s.right;
-                };
-            }
-            0x66 => {
-                unsafe {
-                    self.state.hl.as_u8s.left = self.memory.get(self.state.hl.as_u16);
-                };
+            0x3F => self.toggle_flag(FLAGS::C),
+            0x40 => {}
+            0x41 => unsafe { self.state.bc.as_u8s.left = self.state.bc.as_u8s.right },
+            0x42 => unsafe { self.state.bc.as_u8s.left = self.state.de.as_u8s.left },
+            0x43 => unsafe { self.state.bc.as_u8s.left = self.state.de.as_u8s.right },
+            0x44 => unsafe { self.state.bc.as_u8s.left = self.state.hl.as_u8s.left },
+            0x45 => unsafe { self.state.bc.as_u8s.left = self.state.hl.as_u8s.right },
+            0x46 => unsafe { self.state.bc.as_u8s.left = self.memory.get(self.state.hl.as_u16) },
+            0x47 => unsafe { self.state.bc.as_u8s.left = self.state.af.as_u8s.left },
+            0x48 => unsafe { self.state.bc.as_u8s.right = self.state.bc.as_u8s.left },
+            0x49 => {}
+            0x4A => unsafe { self.state.bc.as_u8s.right = self.state.de.as_u8s.left },
+            0x4B => unsafe { self.state.bc.as_u8s.right = self.state.de.as_u8s.right },
+            0x4C => unsafe { self.state.bc.as_u8s.right = self.state.hl.as_u8s.left },
+            0x4D => unsafe { self.state.bc.as_u8s.right = self.state.hl.as_u8s.right },
+            0x4E => unsafe { self.state.bc.as_u8s.right = self.memory.get(self.state.hl.as_u16) },
+            0x4F => unsafe { self.state.bc.as_u8s.right = self.state.af.as_u8s.left },
+            0x50 => unsafe { self.state.de.as_u8s.left = self.state.bc.as_u8s.left },
+            0x51 => unsafe { self.state.de.as_u8s.left = self.state.bc.as_u8s.right },
+            0x52 => {}
+            0x53 => unsafe { self.state.de.as_u8s.left = self.state.de.as_u8s.right },
+            0x54 => unsafe { self.state.de.as_u8s.left = self.state.hl.as_u8s.left },
+            0x55 => unsafe { self.state.de.as_u8s.left = self.state.hl.as_u8s.right },
+            0x56 => unsafe { self.state.de.as_u8s.left = self.memory.get(self.state.hl.as_u16) },
+            0x57 => unsafe { self.state.de.as_u8s.left = self.state.af.as_u8s.left },
+            0x58 => unsafe { self.state.de.as_u8s.right = self.state.bc.as_u8s.left },
+            0x59 => unsafe { self.state.de.as_u8s.right = self.state.bc.as_u8s.right },
+            0x5A => unsafe { self.state.de.as_u8s.right = self.state.de.as_u8s.left },
+            0x5B => {}
+            0x5C => unsafe { self.state.de.as_u8s.right = self.state.hl.as_u8s.left },
+            0x5D => unsafe { self.state.de.as_u8s.right = self.state.hl.as_u8s.right },
+            0x5E => unsafe { self.state.de.as_u8s.right = self.memory.get(self.state.hl.as_u16) },
+            0x5F => unsafe { self.state.de.as_u8s.right = self.state.af.as_u8s.left },
+            0x60 => unsafe { self.state.hl.as_u8s.left = self.state.bc.as_u8s.left },
+            0x61 => unsafe { self.state.hl.as_u8s.left = self.state.bc.as_u8s.right },
+            0x62 => unsafe { self.state.hl.as_u8s.left = self.state.de.as_u8s.left },
+            0x63 => unsafe { self.state.hl.as_u8s.left = self.state.de.as_u8s.right },
+            0x64 => {}
+            0x65 => unsafe { self.state.hl.as_u8s.left = self.state.hl.as_u8s.right },
+            0x66 => unsafe { self.state.hl.as_u8s.left = self.memory.get(self.state.hl.as_u16) },
+            0x67 => unsafe { self.state.hl.as_u8s.left = self.state.af.as_u8s.left },
+            0x68 => unsafe { self.state.hl.as_u8s.right = self.state.bc.as_u8s.left },
+            0x69 => unsafe { self.state.hl.as_u8s.right = self.state.bc.as_u8s.right },
+            0x6A => unsafe { self.state.hl.as_u8s.right = self.state.de.as_u8s.left },
+            0x6B => unsafe { self.state.hl.as_u8s.right = self.state.de.as_u8s.right },
+            0x6C => unsafe { self.state.hl.as_u8s.right = self.state.hl.as_u8s.left },
+            0x6D => {}
+            0x6E => unsafe { self.state.hl.as_u8s.right = self.memory.get(self.state.hl.as_u16) },
+            0x6F => unsafe { self.state.hl.as_u8s.right = self.state.af.as_u8s.left },
+            0x70 => unsafe {
+                self.memory
+                    .set(self.state.hl.as_u16, self.state.bc.as_u8s.left)
+            },
+            0x71 => unsafe {
+                self.memory
+                    .set(self.state.hl.as_u16, self.state.bc.as_u8s.right)
+            },
+            0x72 => unsafe {
+                self.memory
+                    .set(self.state.hl.as_u16, self.state.de.as_u8s.left)
+            },
+            0x73 => unsafe {
+                self.memory
+                    .set(self.state.hl.as_u16, self.state.de.as_u8s.right)
+            },
+            0x74 => unsafe {
+                self.memory
+                    .set(self.state.hl.as_u16, self.state.hl.as_u8s.left)
+            },
+            0x75 => unsafe {
+                self.memory
+                    .set(self.state.hl.as_u16, self.state.hl.as_u8s.right)
+            },
+            0x76 => panic!("HALT instruction: 0x76"),
+            0x77 => unsafe {
+                self.memory
+                    .set(self.state.hl.as_u16, self.state.af.as_u8s.left)
+            },
+            0x78 => unsafe { self.state.af.as_u8s.left = self.state.bc.as_u8s.left },
+            0x79 => unsafe { self.state.af.as_u8s.left = self.state.bc.as_u8s.right },
+            0x7A => unsafe { self.state.af.as_u8s.left = self.state.de.as_u8s.left },
+            0x7B => unsafe { self.state.af.as_u8s.left = self.state.de.as_u8s.right },
+            0x7C => unsafe { self.state.af.as_u8s.left = self.state.hl.as_u8s.left },
+            0x7D => unsafe { self.state.af.as_u8s.left = self.state.hl.as_u8s.right },
+            0x7E => unsafe { self.state.af.as_u8s.left = self.memory.get(self.state.hl.as_u16) },
+            0x7F => {}
+            0x80 => unsafe {
+                self.state.af.as_u8s.left = self
+                    .state
+                    .af
+                    .as_u8s
+                    .left
+                    .wrapping_add(self.state.bc.as_u8s.left)
+            },
+            0x81 => unsafe {
+                self.state.af.as_u8s.left = self
+                    .state
+                    .af
+                    .as_u8s
+                    .left
+                    .wrapping_add(self.state.bc.as_u8s.right)
+            },
+            0x82 => unsafe {
+                self.state.af.as_u8s.left = self
+                    .state
+                    .af
+                    .as_u8s
+                    .left
+                    .wrapping_add(self.state.de.as_u8s.left)
+            },
+            0x83 => unsafe {
+                self.state.af.as_u8s.left = self
+                    .state
+                    .af
+                    .as_u8s
+                    .left
+                    .wrapping_add(self.state.de.as_u8s.right)
+            },
+            0x84 => unsafe {
+                self.state.af.as_u8s.left = self
+                    .state
+                    .af
+                    .as_u8s
+                    .left
+                    .wrapping_add(self.state.hl.as_u8s.left)
+            },
+            0x85 => unsafe {
+                self.state.af.as_u8s.left = self
+                    .state
+                    .af
+                    .as_u8s
+                    .left
+                    .wrapping_add(self.state.hl.as_u8s.right)
+            },
+            0x86 => unsafe {
+                self.state.af.as_u8s.left = self
+                    .state
+                    .af
+                    .as_u8s
+                    .left
+                    .wrapping_add(self.memory.get(self.state.hl.as_u16))
+            },
+            0x87 => unsafe {
+                self.state.af.as_u8s.left = self
+                    .state
+                    .af
+                    .as_u8s
+                    .left
+                    .wrapping_add(self.state.af.as_u8s.left)
+            },
+            0x88 => unsafe {
+                self.state.af.as_u8s.left = self
+                    .state
+                    .af
+                    .as_u8s
+                    .left
+                    .wrapping_add(self.state.bc.as_u8s.left + self.get_flag(FLAGS::C))
+            },
+            0x89 => unsafe {
+                self.state.af.as_u8s.left = self
+                    .state
+                    .af
+                    .as_u8s
+                    .left
+                    .wrapping_add(self.state.bc.as_u8s.right + self.get_flag(FLAGS::C))
+            },
+            0x8A => unsafe {
+                self.state.af.as_u8s.left = self
+                    .state
+                    .af
+                    .as_u8s
+                    .left
+                    .wrapping_add(self.state.de.as_u8s.left + self.get_flag(FLAGS::C))
+            },
+            0x8B => unsafe {
+                self.state.af.as_u8s.left = self
+                    .state
+                    .af
+                    .as_u8s
+                    .left
+                    .wrapping_add(self.state.de.as_u8s.right + self.get_flag(FLAGS::C))
+            },
+            0x8C => unsafe {
+                self.state.af.as_u8s.left = self
+                    .state
+                    .af
+                    .as_u8s
+                    .left
+                    .wrapping_add(self.state.hl.as_u8s.left + self.get_flag(FLAGS::C))
+            },
+            0x8D => unsafe {
+                self.state.af.as_u8s.left = self
+                    .state
+                    .af
+                    .as_u8s
+                    .left
+                    .wrapping_add(self.state.hl.as_u8s.right + self.get_flag(FLAGS::C))
+            },
+            0x8E => unsafe {
+                self.state.af.as_u8s.left =
+                    self.state.af.as_u8s.left.wrapping_add(
+                        self.memory.get(self.state.hl.as_u16) + self.get_flag(FLAGS::C),
+                    )
+            },
+            0x8F => unsafe {
+                self.state.af.as_u8s.left = self
+                    .state
+                    .af
+                    .as_u8s
+                    .left
+                    .wrapping_add(self.state.af.as_u8s.left + self.get_flag(FLAGS::C))
+            },
+            0x90 => unsafe {
+                self.state.af.as_u8s.left = self
+                    .state
+                    .af
+                    .as_u8s
+                    .left
+                    .wrapping_sub(self.state.bc.as_u8s.left)
+            },
+            0x91 => unsafe {
+                self.state.af.as_u8s.left = self
+                    .state
+                    .af
+                    .as_u8s
+                    .left
+                    .wrapping_sub(self.state.bc.as_u8s.right)
+            },
+            0x92 => unsafe {
+                self.state.af.as_u8s.left = self
+                    .state
+                    .af
+                    .as_u8s
+                    .left
+                    .wrapping_sub(self.state.de.as_u8s.left)
+            },
+            0x93 => unsafe {
+                self.state.af.as_u8s.left = self
+                    .state
+                    .af
+                    .as_u8s
+                    .left
+                    .wrapping_sub(self.state.de.as_u8s.right)
+            },
+            0x94 => unsafe {
+                self.state.af.as_u8s.left = self
+                    .state
+                    .af
+                    .as_u8s
+                    .left
+                    .wrapping_sub(self.state.hl.as_u8s.left)
+            },
+            0x95 => unsafe {
+                self.state.af.as_u8s.left = self
+                    .state
+                    .af
+                    .as_u8s
+                    .left
+                    .wrapping_sub(self.state.hl.as_u8s.right)
+            },
+            0x96 => unsafe {
+                self.state.af.as_u8s.left = self
+                    .state
+                    .af
+                    .as_u8s
+                    .left
+                    .wrapping_sub(self.memory.get(self.state.hl.as_u16))
+            },
+            0x97 => unsafe {
+                self.state.af.as_u8s.left = self
+                    .state
+                    .af
+                    .as_u8s
+                    .left
+                    .wrapping_sub(self.state.af.as_u8s.left)
+            },
+            0x98 => unsafe {
+                self.state.af.as_u8s.left = self
+                    .state
+                    .af
+                    .as_u8s
+                    .left
+                    .wrapping_sub(self.state.bc.as_u8s.left + self.get_flag(FLAGS::C))
+            },
+            0x99 => unsafe {
+                self.state.af.as_u8s.left = self
+                    .state
+                    .af
+                    .as_u8s
+                    .left
+                    .wrapping_sub(self.state.bc.as_u8s.right + self.get_flag(FLAGS::C))
+            },
+            0x9A => unsafe {
+                self.state.af.as_u8s.left = self
+                    .state
+                    .af
+                    .as_u8s
+                    .left
+                    .wrapping_sub(self.state.de.as_u8s.left + self.get_flag(FLAGS::C))
+            },
+            0x9B => unsafe {
+                self.state.af.as_u8s.left = self
+                    .state
+                    .af
+                    .as_u8s
+                    .left
+                    .wrapping_sub(self.state.de.as_u8s.right + self.get_flag(FLAGS::C))
+            },
+            0x9C => unsafe {
+                self.state.af.as_u8s.left = self
+                    .state
+                    .af
+                    .as_u8s
+                    .left
+                    .wrapping_sub(self.state.hl.as_u8s.left + self.get_flag(FLAGS::C))
+            },
+            0x9D => unsafe {
+                self.state.af.as_u8s.left = self
+                    .state
+                    .af
+                    .as_u8s
+                    .left
+                    .wrapping_sub(self.state.hl.as_u8s.right + self.get_flag(FLAGS::C))
+            },
+            0x9E => unsafe {
+                self.state.af.as_u8s.left =
+                    self.state.af.as_u8s.left.wrapping_sub(
+                        self.memory.get(self.state.hl.as_u16) + self.get_flag(FLAGS::C),
+                    )
+            },
+            0x9F => unsafe {
+                self.state.af.as_u8s.left = self
+                    .state
+                    .af
+                    .as_u8s
+                    .left
+                    .wrapping_sub(self.state.af.as_u8s.left + self.get_flag(FLAGS::C))
+            },
+            0xA0 => unsafe {
+                self.state.af.as_u8s.left =
+                    self.state.af.as_u8s.left.bitand(self.state.bc.as_u8s.left)
+            },
+            0xA1 => unsafe {
+                self.state.af.as_u8s.left =
+                    self.state.af.as_u8s.left.bitand(self.state.bc.as_u8s.right)
+            },
+            0xA2 => unsafe {
+                self.state.af.as_u8s.left =
+                    self.state.af.as_u8s.left.bitand(self.state.de.as_u8s.left)
+            },
+            0xA3 => unsafe {
+                self.state.af.as_u8s.left =
+                    self.state.af.as_u8s.left.bitand(self.state.de.as_u8s.right)
+            },
+            0xA4 => unsafe {
+                self.state.af.as_u8s.left =
+                    self.state.af.as_u8s.left.bitand(self.state.hl.as_u8s.left)
+            },
+            0xA5 => unsafe {
+                self.state.af.as_u8s.left =
+                    self.state.af.as_u8s.left.bitand(self.state.hl.as_u8s.right)
+            },
+            0xA6 => unsafe {
+                self.state.af.as_u8s.left = self
+                    .state
+                    .af
+                    .as_u8s
+                    .left
+                    .bitand(self.memory.get(self.state.hl.as_u16))
+            },
+            0xA7 => unsafe {
+                self.state.af.as_u8s.left =
+                    self.state.af.as_u8s.left.bitand(self.state.af.as_u8s.left)
+            },
+            0xA8 => unsafe {
+                self.state.af.as_u8s.left =
+                    self.state.af.as_u8s.left.bitxor(self.state.bc.as_u8s.left)
+            },
+            0xA9 => unsafe {
+                self.state.af.as_u8s.left =
+                    self.state.af.as_u8s.left.bitxor(self.state.bc.as_u8s.right)
+            },
+            0xAA => unsafe {
+                self.state.af.as_u8s.left =
+                    self.state.af.as_u8s.left.bitxor(self.state.de.as_u8s.left)
+            },
+            0xAB => unsafe {
+                self.state.af.as_u8s.left =
+                    self.state.af.as_u8s.left.bitxor(self.state.de.as_u8s.right)
+            },
+            0xAC => unsafe {
+                self.state.af.as_u8s.left =
+                    self.state.af.as_u8s.left.bitxor(self.state.hl.as_u8s.left)
+            },
+            0xAD => unsafe {
+                self.state.af.as_u8s.left =
+                    self.state.af.as_u8s.left.bitxor(self.state.hl.as_u8s.right)
+            },
+            0xAE => unsafe {
+                self.state.af.as_u8s.left = self
+                    .state
+                    .af
+                    .as_u8s
+                    .left
+                    .bitxor(self.memory.get(self.state.hl.as_u16))
+            },
+            0xAF => unsafe {
+                self.state.af.as_u8s.left =
+                    self.state.af.as_u8s.left.bitxor(self.state.af.as_u8s.left)
+            },
+            0xB0 => unsafe {
+                self.state.af.as_u8s.left =
+                    self.state.af.as_u8s.left.bitor(self.state.bc.as_u8s.left)
+            },
+            0xB1 => unsafe {
+                self.state.af.as_u8s.left =
+                    self.state.af.as_u8s.left.bitor(self.state.bc.as_u8s.right)
+            },
+            0xB2 => unsafe {
+                self.state.af.as_u8s.left =
+                    self.state.af.as_u8s.left.bitor(self.state.de.as_u8s.left)
+            },
+            0xB3 => unsafe {
+                self.state.af.as_u8s.left =
+                    self.state.af.as_u8s.left.bitor(self.state.de.as_u8s.right)
+            },
+            0xB4 => unsafe {
+                self.state.af.as_u8s.left =
+                    self.state.af.as_u8s.left.bitor(self.state.hl.as_u8s.left)
+            },
+            0xB5 => unsafe {
+                self.state.af.as_u8s.left =
+                    self.state.af.as_u8s.left.bitor(self.state.hl.as_u8s.right)
+            },
+            0xB6 => unsafe {
+                self.state.af.as_u8s.left = self
+                    .state
+                    .af
+                    .as_u8s
+                    .left
+                    .bitor(self.memory.get(self.state.hl.as_u16))
+            },
+            0xB7 => unsafe {
+                self.state.af.as_u8s.left =
+                    self.state.af.as_u8s.left.bitor(self.state.af.as_u8s.left)
+            },
+            0xB8 => unsafe {
+                if self.state.af.as_u8s.left == self.state.bc.as_u8s.left {
+                    self.set_flag(FLAGS::Z);
+                }
+            },
+            0xB9 => unsafe {
+                if self.state.af.as_u8s.left == self.state.bc.as_u8s.right {
+                    self.set_flag(FLAGS::Z);
+                }
+            },
+            0xBA => unsafe {
+                if self.state.af.as_u8s.left == self.state.de.as_u8s.left {
+                    self.set_flag(FLAGS::Z);
+                }
+            },
+            0xBB => unsafe {
+                if self.state.af.as_u8s.left == self.state.de.as_u8s.right {
+                    self.set_flag(FLAGS::Z);
+                }
+            },
+            0xBC => unsafe {
+                if self.state.af.as_u8s.left == self.state.hl.as_u8s.left {
+                    self.set_flag(FLAGS::Z);
+                }
+            },
+            0xBD => unsafe {
+                if self.state.af.as_u8s.left == self.state.hl.as_u8s.right {
+                    self.set_flag(FLAGS::Z);
+                }
+            },
+            0xBE => unsafe {
+                if self.state.af.as_u8s.left == self.memory.get(self.state.hl.as_u16) {
+                    self.set_flag(FLAGS::Z);
+                }
+            },
+            0xBF => self.set_flag(FLAGS::Z),
+            0xC0 => unsafe {
+                if self.get_flag(FLAGS::Z) == 0 {
+                    let address = self.state.sp.as_u16;
+                    self.state.pc.as_u8s.left = self.memory.get(address);
+                    self.state.pc.as_u8s.right = self.memory.get(address + 1);
+                    self.state.sp.as_u16 = self.state.sp.as_u16.wrapping_add(2);
+                }
+            },
+            0xC1 => unsafe {
+                let address = self.state.sp.as_u16;
+                self.state.bc.as_u8s.left = self.memory.get(address);
+                self.state.bc.as_u8s.right = self.memory.get(address + 1);
+                self.state.sp.as_u16 = self.state.sp.as_u16.wrapping_add(2);
+            },
+            0xC2 => {
+                let word = self.ld_immediate_word();
+                if self.get_flag(FLAGS::Z) == 0 {
+                    self.state.pc = word;
+                }
             }
             0xC3 => {
                 self.state.pc = self.ld_immediate_word();
             }
+            0xC4 => {
+                let maybe_next = self.ld_immediate_word();
+                if self.get_flag(FLAGS::Z) == 0 {
+                    self.push(self.state.pc);
+                    self.state.pc = maybe_next;
+                }
+            }
+            0xC5 => self.push(self.state.bc),
+            0xC6 => unsafe {
+                self.state.af.as_u8s.left = self
+                    .state
+                    .af
+                    .as_u8s
+                    .left
+                    .wrapping_add(self.ld_immediate_byte())
+            },
+            0xC7 => self.rst(0x00),
+            0xC8 => {
+                if self.get_flag(FLAGS::Z) == 1 {
+                    self.state.pc = self.pop_word()
+                }
+            }
+            0xC9 => self.state.pc = self.pop_word(),
+            0xCA => {
+                let maybe_next = self.ld_immediate_word();
+                if self.get_flag(FLAGS::Z) == 1 {
+                    self.state.pc = maybe_next;
+                }
+            }
+            0xCB => println!("Undefined behaviour: opcode CB"),
+            0xCC => {
+                let maybe_next = self.ld_immediate_word();
+                if self.get_flag(FLAGS::Z) == 1 {
+                    self.push(self.state.pc);
+                    self.state.pc = maybe_next;
+                }
+            }
+            0xCD => {
+                self.push(self.state.pc);
+                self.state.pc = self.ld_immediate_word();
+            }
+            0xCE => unsafe {
+                self.state.af.as_u8s.left = self
+                    .state
+                    .af
+                    .as_u8s
+                    .left
+                    .wrapping_add(self.ld_immediate_byte() + self.get_flag(FLAGS::C))
+            },
+            0xCF => self.rst(0x08),
+
             0xEA => {
                 unsafe {
                     let address = self.ld_immediate_word().as_u16;
@@ -178,11 +761,39 @@ impl CPU {
     fn next_opcode(&mut self) -> u8 {
         unsafe {
             let opcode = self.memory.get(self.state.pc.as_u16);
-            self.state.pc.as_u16 += 0x1;
+            self.state.pc.as_u16 = self.state.pc.as_u16.wrapping_add(0x1);
             return opcode;
         };
     }
 
+    fn rst(&mut self, address: u16) {
+        self.push(self.state.pc);
+        self.state.pc.as_u8s.left = 0x0;
+        self.state.pc.as_u8s.right = self.memory.get(address);
+    }
+
+    fn push(&mut self, register: Register) {
+        unsafe {
+            let address = self.state.sp.as_u16;
+            self.memory.set(address - 1, register.as_u8s.right);
+            self.memory.set(address - 2, register.as_u8s.left);
+            self.state.sp.as_u16 = address - 2;
+        }
+    }
+
+    fn pop_word(&mut self) -> Register {
+        unsafe {
+            let address = self.state.sp.as_u16;
+            self.state.sp.as_u16 = self.state.sp.as_u16.wrapping_add(2);
+            Register {
+                as_u8s: Inner {
+                    left: self.memory.get(address),
+                    right: self.memory.get(address + 1),
+                },
+            }
+        }
+    }
+
     fn store_word(&mut self, address: u16, word: Register) {
         unsafe {
             self.memory.set(address, word.as_u8s.left);
@@ -208,4 +819,23 @@ impl CPU {
             return self.state.af.as_u8s.right & (1 << flag as u8);
         }
     }
+
+    fn set_flag(&mut self, flag: FLAGS) {
+        unsafe {
+            self.state.af.as_u8s.right = self.state.af.as_u8s.right.bitor(1 << flag as u8);
+        };
+    }
+
+    #[allow(dead_code)]
+    fn clear_flag(&mut self, flag: FLAGS) {
+        unsafe {
+            self.state.af.as_u8s.right = self.state.af.as_u8s.right.bitand(!(1 << flag as u8));
+        };
+    }
+
+    fn toggle_flag(&mut self, flag: FLAGS) {
+        unsafe {
+            self.state.af.as_u8s.right = self.state.af.as_u8s.right.bitxor(1 << flag as u8);
+        };
+    }
 }