Atari Lynx Diagnostic Cartridge Reproduction

This is a little diagnostic program out of Atari Japan (or so it says) to help you figure out some problems with your Lynx. I he power on screen and menu say "Lynx II" but it works just fine on a Lynx I.  The cartridge tests the following: System  LCD Joystick (tests all the buttons) Speaker Stereo Comlynx (this is "X"d out)  As much as I would like to tell you that if you buy two of these, you could test out ComLynx . . . that does not appear to work.  I tried.  Maybe I am not doing something, but I do have 30 years experience of powering on Lynxes correctly to get Comlynx to work. ;-) Also, if you press Option 2, it will tell you how your power is configured and what revision of Mikey you have!