added ranks to nes/gb versions

nes/eznes.h

@@ -37,6 +37,7 @@
 #define EZJOY_B  6
 #define EZJOY_SL 7
 #define EZJOY_ST 8
+#define EZJOY_COMBO 9
 
 #define EZ_CORNER_UL (char) 20
 #define EZ_CORNER_UR (char) 18
@@ -197,6 +198,23 @@ void wait_for_start_rand() {
   srand(_ez_entropy);
 }
 
+/* wait for Start or a button combination */
+u8 wait_for_start_or_combo(u8 combo_mask) {
+  u8 last_joy = 0, joy, pressed;
+  /* wait until the previous key is released */
+  while(joy_read(JOY_1));
+  /* wait for a new press */
+  while(1) {
+    ++_ez_entropy;
+    joy = joy_read(JOY_1);
+    pressed = joy & ~last_joy;
+    if(pressed == combo_mask) return EZJOY_COMBO;
+    if(pressed & JOY_BTN_4_MASK) return EZJOY_ST;
+    last_joy = joy;
+    waitvsync();
+  } 
+}
+
 /* Generic helper methods */
 
 /* Array shuffle method */