Minor changes

1 files changed, 15 insertions, 5 deletions

diff --git a/src/vcpu.c b/src/vcpu.c
index e722bb0..4ca5cc1 100644
--- a/src/vcpu.c
+++ b/src/vcpu.c
@@ -20,14 +20,19 @@ void VCPUFetch(){
 }
 
 void VCPUDecode(){
-  State.X=(State.opcode<<4) & 0xF0;
-  State.Y=(State.opcode<<8) & 0xF0;
-  State.N=(State.opcode<<12) & 0xF0;
-  State.NN=(State.opcode<<8) & 0xFF;
-  State.NNN=(State.opcode<<4) & 0xFFF0;
+  State.X=(State.opcode>>8) & 0xF;
+  State.Y=(State.opcode>>4) & 0xF;
+  State.N=State.opcode & 0xF;
+
+  State.NN=State.Y;
+  State.NN=State.NN<<4;
+  State.NN=State.NN | State.N;
+
+  State.NNN=State.opcode&0x0FFF;
 }
 
 void VCPUExecute(){
+  //  VCPUDump();
   switch(State.opcode >> 12){
   case 0x0:
     ScreenClear();
@@ -63,4 +68,9 @@ void VCPUExecute(){
 
 void VCPUDump(){
   printf("opcode: 0x%04x\n",State.opcode&0xFFFF);
+  printf("X: 0x%01x\n",State.X);
+  printf("Y: 0x%01x\n",State.Y);
+  printf("N: 0x%01x\n",State.N);
+  printf("NN: 0x%02x\n",State.NN);
+  printf("NNN: 0x%03x\n",State.NNN);
 }