Manual says:Anyone disable button 4 on HAS Version 4? Trying to fix the mvs D button being tied to LK. Tl;dr can't do darkness illusion raging demon input because of it. I've tried holding LK (D button) on power up but it only disables on a real neo geo controller. Even tried a PS4 controller.
I feel like im holding the wrong button (even though in the test menu the button im holding on power up is LK)
In order to disable button 4 and 5 output on the JAMMA connector, press and hold down the physical button 4 on the Player 1 controller (Player 1 DB15 pin #4) while powering on the HAS. Once the two status LEDs stop blinking, you can release the button 4. Button 4 and 5 outputs on the JAMMA connector will be disabled.
Side note: Another way to disable buttons 4 and 5 is to close the jumper “JP2”. You can do this by either running a jumper wire across the JP2 pads, or by installing a 2pin 2.54mm Gold Pin header (male) to the JP2 pads and attaching a jumper (the recommended method). This is method is only for advanced users, do not attempt it unless you have decent soldering skills.
In regards to the Side note, I think Mike made it easier on v4, but I'm not at home to take a look or try for you right now.