Cleanup BASIC sources

src/main.c

@@ -46,6 +46,7 @@ int main(void) {
 
   printf("6502PC Emulator with MS Basic\n");
   printf("CTRL + G to exit\n");
+  printf("DF6FR to jump to BASIC\n");
 
   clock_gettime(CLOCK_MONOTONIC, &emulationStart);