diff --git a/src/.main.c.swp b/src/.main.c.swp
deleted file mode 100644
index c26b609..0000000
Binary files a/src/.main.c.swp and /dev/null differ
diff --git a/src/.toy.h.swp b/src/.toy.h.swp
deleted file mode 100644
index 16bf9ea..0000000
Binary files a/src/.toy.h.swp and /dev/null differ
diff --git a/src/main.c b/src/main.c
index 7b11a7d..0c925a2 100644
--- a/src/main.c
+++ b/src/main.c
@@ -15,24 +15,28 @@ int main(int argc, char *argv[])
     uint8_t     op_code;
     uint16_t    pc = 0;
     int         data_addr=0;
+    char        quit;
     bool        run = true;
 
     if(initialise_ram(ram,argc,argv)==-1) return 1;
 
-//    while(run && pc<(RAM_SIZE-1))
-//    {
+    while(run && pc<(RAM_SIZE-1))
+    {
         ir = ram[pc];
         op_code = get_opcode(ir);
         data_addr=find_data(ir);
         #ifdef DEBUG
-            printf("OP Code: %u\n",op_code);
+            printf("OP Code: %"PRIu8"\n",op_code);
             printf("Adresse: %d\n",data_addr);
-            makeHexDump(true,ram);
         #endif
-        if(execute(op_code,data_addr,*ram))
-            pc=data_addr(ram[pc]);
+        if(execute(op_code,data_addr,ram))
+            pc=find_data(ram[pc]);              //jump if ACCU is ZERO
         else pc++;
-//    }
+        printf("(n)ext step or (q)uit or (c)oredump ?\n");
+        scanf("%c",&quit);
+        if(quit == 'c') makeHexDump(true,ram);
+        else if(quit == 'q') run = false;
+    }
  
 
 
diff --git a/src/toy.c b/src/toy.c
index e85843f..e640f8f 100644
--- a/src/toy.c
+++ b/src/toy.c
@@ -71,23 +71,28 @@ bool execute(uint8_t op_code, int data_addr, uint16_t *ram) // jump when 1
     //vorsicht uint16 und Zweierkomplement noch nicht stringent !!!
     //Vorsicht bool ops bei sigend int typs sind undefiniert !
    static uint16_t accu;
+   bool jump=false;
+
     switch(op_code)
     {
-        case 0: ram[data_addr]=accu; break;
-        case 1: accu=ram[data_addr]; break;
-//        case 2: if(!accu) break;
-        case 3: accu=accu + ram[data_addr]; break;
-        case 4: accu=accu - ram[data_addr]; break;
-        case 5: accu=accu | ram[data_addr]; break;
-        case 6: accu=accu & ram[data_addr]; break;
-        case 7: accu=accu & ram[data_addr]; break;
-        case 8: break;
-        case 9: break;
-        case 10: break;
-        case 11: break;
-        case 12: break;
-        case 13: break;
-        case 14: break;
-        case 15: break;
+        case 0: ram[data_addr] = accu;              break; //STORE
+        case 1: accu = ram[data_addr];              break; //LOAD
+        case 2: jump = ((accu==0) ? true : false);  break; //JMPZ
+        case 3: accu = accu + ram[data_addr];       break; //ADD
+        case 4: accu = accu - ram[data_addr];       break; //SUB
+        case 5: accu = accu | ram[data_addr];       break; //OR
+        case 6: accu = accu & ram[data_addr];       break; //AND
+        case 7: accu = accu ^ ram[data_addr];       break; //XOR
+        case 8: accu = ~accu;                       break; //NOT
+        case 9: accu++;                             break; //INC
+        case 10: accu--;                            break; //DEC
+        case 11: accu = 0;                          break; //ZERO
+        case 12: ;                                  break; //NOP
+        case 13: ;                                  break; //NOP
+        case 14: ;                                  break; //NOP
+        case 15: ;                                  break; //NOP
+    }
+        printf("ACCU: %"PRIu16 "\n",accu);
+        return jump;
 }
 
diff --git a/src/toy.h b/src/toy.h
index ac0f288..469e337 100644
--- a/src/toy.h
+++ b/src/toy.h
@@ -2,7 +2,7 @@
 #define TOY_H
 
 #include <stdio.h>
-#include <stdint.h>
+#include <inttypes.h>
 #include <stdbool.h>
 #include <stdlib.h>