Fixed Starpath debugging (fixes #1075)

src/emucore/CartAR.hxx

@@ -97,6 +97,14 @@ class CartridgeAR : public Cartridge
     */
     uInt16 romBankCount() const override;
 
+    /**
+      Get the size of a bank.
+
+      @param bank  The bank to get the size for
+      @return  The bank's size
+    */
+    uInt16 bankSize(uInt16 bank = 0) const override { return 4_KB; };
+
     /**
       Patch the cartridge ROM.