diff --git a/src/vcpu.c b/src/vcpu.c
index ab7177c..c4187cb 100644
--- a/src/vcpu.c
+++ b/src/vcpu.c
@@ -2,6 +2,8 @@
 #include "mem.h"
 #include "screen.h"
 #include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
 
 // Current VCPU state
 VCPU_State State;
@@ -9,6 +11,7 @@ VCPU_State State;
 void VCPUInit(){
   State.PC=ADDR_ROM;
   State.S=0;
+  srand(time(NULL));
 }
 
 void VCPUFetch(){
@@ -65,7 +68,7 @@ void VCPUExecute(){
       State.PC+=2;
     break;
     ;;
-  case 0x5: // SNE: VX, VY
+  case 0x5: // SE: VX, VY
     if(State.V[State.X]==State.V[State.Y])
       State.PC+=2;
     break;
@@ -78,10 +81,81 @@ void VCPUExecute(){
     State.V[State.X]+=State.NN;
     break
       ;;
+  case 0x8: // Register operations
+    switch(State.N){
+    case 0x1: // VX = VX OR VY
+      State.V[State.X]=State.V[State.X] | State.V[State.Y];
+      break;
+      ;;
+    case 0x2: // VX = VX AND VY
+      State.V[State.X]=State.V[State.X] & State.V[State.Y];
+      break;
+      ;;
+    case 0x3: // VX = VX XOR VY
+      State.V[State.X]=State.V[State.X] ^ State.V[State.Y];
+      break;
+      ;;
+    case 0x4: // VX = VX + VY
+      if(State.V[State.X] + State.V[State.Y] > 255)
+        State.V[REG_FLAG]=1;
+      else
+        State.V[REG_FLAG]=0;
+      State.V[State.X]=(State.V[State.X] + State.V[State.Y]) & 0xFF;
+      break;
+      ;;
+    case 0x5: // VX = VX - VY
+      if(State.V[State.X] > State.V[State.Y])
+        State.V[REG_FLAG]=1;
+      else
+        State.V[REG_FLAG]=0;
+      State.V[State.X]=State.V[State.X] - State.V[State.Y];
+      break;
+      ;;
+    case 0x6: // VX = VX SHR 1
+      if(State.V[State.X] & 0x1 == 1)
+        State.V[REG_FLAG]=1;
+      else
+        State.V[REG_FLAG]=0;
+      State.V[State.X]=State.V[State.X] >> 1;
+      break;
+      ;;
+    case 0x7: // VX = VY - VX
+      if(State.V[State.X] < State.V[State.Y])
+        State.V[REG_FLAG]=1;
+      else
+        State.V[REG_FLAG]=0;
+      State.V[State.X]=State.V[State.Y] - State.V[State.X];
+      break;
+      ;;
+    case 0xE: // VX = VX SHL 1
+      if(State.V[State.X] >> 15 == 1)
+        State.V[REG_FLAG]=1;
+      else
+        State.V[REG_FLAG]=0;
+      State.V[State.X]=State.V[State.X] << 1;
+      break;
+      ;;
+    }    
+    break
+      ;;
+  case 0x9: // SNE: VX, VY
+    if(State.V[State.X]!=State.V[State.Y])
+      State.PC+=2;
+    break;
+    ;;
   case 0xA:
     State.I=State.NNN;
     break
       ;;
+  case 0xB:
+    State.PC=State.V[0]+State.NNN;
+    break
+      ;;
+  case 0xC:
+    unsigned short n = rand() % 255 + 1;
+    State.V[State.X]=n & State.NN;
+    break
+      ;;    
   case 0xD: // Draw a sprite
     int X=State.V[State.X]%63;
     int Y=State.V[State.Y]%31;
@@ -105,6 +179,50 @@ void VCPUExecute(){
     }
     break;
     ;;
+  case 0xE:
+    // TODO
+    break;;
+  case 0xF:
+    switch(State.NN){
+    case 0x07: // Get timer
+      State.V[State.X]=State.DT;
+      break;
+      ;;
+    case 0x0A:
+      // TODO
+      break;
+      ;;
+    case 0x15: // Set timer
+      State.DT=State.V[State.X];
+      break;
+      ;;
+    case 0x18: // Set sound timer
+      State.ST=State.V[State.X];
+      break;
+      ;;
+    case 0x1E: // I = I + VX
+      State.I=State.I+State.V[State.X];
+      break;
+      ;;
+    case 0x29:
+      // TODO
+      break;
+      ;;
+    case 0x33:
+      // TODO
+      break;
+      ;;
+    case 0x55:
+      MemCopy(State.V,0xF,State.I);
+      break;
+      ;;
+    case 0x65:
+      MemRead(State.V,0xF,State.I);
+      break;
+      ;;
+    }
+    break;
+      ;;
   }
 }