Recent content by donluca

  1. donluca

    Introducing the Gear Master Converter (plays unmodified Game Gear games on Master System)

    Unbelievable, this is really the stuff of dreams, well done Apocalypse! I wonder if maybe a Mega Drive could have been a better candidate as a "host" system? IIRC it still has direct access to the Z80 and you could take advantage of the Mega Drive VDP's larger palette (512 colours, don't quote...
  2. donluca

    Capcom Q-Sound amp help?

    Oh, woopsie. I missed that, sorry. :P By the way, thanks for your efforts, your work will greatly help understanding this kind of hardware better and help people out there repairing broken boards.
  3. donluca

    Capcom Q-Sound amp help?

    The QSound amplifier has been retro-engineered, there are just some caps and resistor values missing. https://twitter.com/WydD/status/1335312921228931072 https://gitlab.com/loic.petit/cps2-reverse/-/tree/master/CPB-001A https://petitl.fr/cps2/CPB-001A/ Hopefully this is finally going to put...
  4. donluca

    Official: CPS1 Multi by Darksoft/Apocalypse - Interest Check Thread

    Thanks for the kind words :) Just to make it clear: I'm alive and well, other things got a bit sketchy and other priorities came up, that's all :D
  5. donluca

    Official: CPS1 Multi by Darksoft/Apocalypse - Interest Check Thread

    Regrettably, I have to ask to be removed from the list.
  6. donluca

    Official: CPS1 Multi by Darksoft/Apocalypse - Interest Check Thread

    I can't remember if this question was already asked, but how much does a game take to load? CPS1 games are rather small, it should be quite quick.
  7. donluca

    Capcom Q-Sound amp help?

    @wuemura according to your own researches, they *are* wrong (EDIT: to better clarify, "they" is referred to ValleyBell and superctr), because as you can clearly read in ValleyBell's information, the phase shifting is done *in software* and not on an outside board and, again, as stated in the...
  8. donluca

    Capcom Q-Sound amp help?

    for @wuemura and all other people how might be interested in the discussion that arose earlier: I've reached out to ValleyBell asking to shed some light (at least for me) on the QSound situation both regarding MAME and how it works and he has given me permission to copy-paste his reply here:
  9. donluca

    Capcom Q-Sound amp help?

    Artemio measured how much current it drew and it was 0.665A https://twitter.com/Artemio/status/1191839819665686528?s=20 As said before, the components can work up to 16V DC IRC. But yeah, a common 12V DC should be enough bypassing the rectifier.
  10. donluca

    Capcom Q-Sound amp help?

    Fair enough. I know there's been lots of drama involving the MAME dev team and this is not the place to discuss this as I don't want to derail the thread (which has lots of meaningful and important information). They have their own way and let's just stop here. Some people don't like their way...
  11. donluca

    Capcom Q-Sound amp help?

    Dude, all that anger towards something so meaningless doesn't do you well, it's bad for your health. Take a deep breath. Chill. Now... QSound amps have been around forever (and people have possibly been frying them by feeding them 18VAC, but that's another story) and by now people would have...
  12. donluca

    Capcom Q-Sound amp help?

    And you're still failing at understanding the fundamental difference between a resistive load and a reactive one and how you can't just apply an R-C filter to obtain a phase shift when you have a resistive load. Since I'm talking to, as you stated yourself, an "hardware developer" (which means...
  13. donluca

    Capcom Q-Sound amp help?

    @wuemura I'm wondering if I'm getting trolled or if you're serious. For once, since we're having a civil discussion, I'll give you the benefit of doubt and believe that you actually know what you're talking about but I need to point out that the first circuit you've shared could work only if...
  14. donluca

    Capcom Q-Sound amp help?

    That's going to wrap it up. If I had one of those I'd just bypass the rectifier and send 12V DC from the cab's PSU and call it a day. No one will ever need the full 45W output of the power amp in a cab.
  15. donluca

    Capcom Q-Sound amp help?

    12V DC might be a tad too low. An educated guess would be that each diode causes a 1V drop, so a bridge would be 2V, hence you need at least a 13.2V DC PSU. The issue here is that this is pretty scary as the board doesn't have any kind of voltage regulation that I can see. Personally, I'd...
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