diff --git a/README.md b/README.md
index c80967a..5166fbd 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,7 @@
 # Koopman TOY CPU Interpreter 
 
 This is a CPU interpreter, based on the specification of Phil Koopmans paper: [Microcoded Versus Hard-wired Control](https://users.ece.cmu.edu/~koopman/misc/byte87a.pdf).<br>
-For more details, have a look at /doc or press `toy_cpu -h` (for help) or `toy_cpu -i` (for cpu architecture overview)
+For more details, have a look at /doc or press `toy_cpu -h` (for help) or `toy_cpu -a` (for cpu architecture overview)
 
 ##  Build
 
diff --git a/src/main.c b/src/main.c
index 2b4babf..243fe13 100644
--- a/src/main.c
+++ b/src/main.c
@@ -28,9 +28,6 @@ int main(int argc, char *argv[])
     if(initialise_ram(ram,argc,argv)==-1) return 1;     /*load data from command line into RAM
                                                         (-1 in case of error,
                                                         else number of correctly read words)*/
-
-    print_architecture();                               //print cpu architecture at startup
-
     while(run)
     {
         ir = ram[pc];        				//get instruction from RAM
@@ -57,19 +54,21 @@ int main(int argc, char *argv[])
         //handle user output
         printf("ACCU: %d\n",get2compl(*ACCU));
         printf("PROGRAM COUNTER: %" PRIu16
-                "\n-----------------------------------",pc);
-        printf("\n(n)ext step or (q)uit or (c)oredump ?\n");
+                "\n----------------------------------------",pc);
+        printf("\n|(n)ext step or (q)uit or (c)oredump ? ");
 
         //handle program flow
         while((quit = getchar()) != '\n')
         {
-			switch(quit)
-			{
-				case EOF: break;
-				case 'c': makeHexDump(true,ram); break;
-				case 'q': run = false;
-			}
+	    	switch(quit)
+		{
+		    case EOF: break;
+		    case 'c': makeHexDump(true,ram); break;
+		    case 'q': run = false;
+		}
         }
+
+        printf("----------------------------------------\n");
     }
     return 0;
 }
diff --git a/src/toy.c b/src/toy.c
index f8070b8..e421ed7 100644
--- a/src/toy.c
+++ b/src/toy.c
@@ -113,7 +113,9 @@ int initialise_ram(uint16_t *ram, int argc, char **argv )
     if(argc<2)
     {
         fprintf(stderr,"%s","no \".toy\" input file!\n"
-                "interpretation terminated. (press -h for help)\n");
+                "interpretation terminated.\n\n"
+                "press toy-CPU -h for help\n"
+                "press toy-CPU -a for cpu architecture overview\n");
         return -1;
     }
     if(argc >2)
@@ -128,7 +130,7 @@ int initialise_ram(uint16_t *ram, int argc, char **argv )
       return -1;
     }
 
-    if(strcmp(argv[1],"-i")==0)
+    if(strcmp(argv[1],"-a")==0)
     {
         printf("interpretation terminated.\n\n");
         print_architecture();