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Dreamcast and Mame cabinet

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Miller:
Ok now im confused lol
The wiring from the dreamcast and PC are both connected together then screwed into the terminal block and on the other side is the original cabinet wiring which goes to the controls. When i go to use the PC the dreamcast is drawing some of the volts hence the reason im only getting 1.25V. I understand how the regulators work but dont get where i would put them and how they would stop the dreamcast drawing volts when im not using it?
I hope that makes sense.

lettuce:
Have you thought about the using the DC emulator NullDC instead of an actually DC. It runs 80% of games pritty much flawless

moloch:
Post some photos of the wiring.

In my cabinet I am using a PC power supply to provide extra power for a stereo amp. I would take extra power from that, but without seeing where you are getting power and what the connections are it is a little tough for me to wrap my head around it.

As far as I am concerned about NullDC is that I cannot find complete versions many of the game that I want. They have the music stripped out or things like that. I am interested in this project because as I said I eventually want to run head to head Virtual On games with friends (and not on split screen).

Miller:
Im not convinced about NullDC alot of messing about when the Dreamcast is so cheap and 100% working, maybe in a few years when its running properly.

Ok heres a pic of P2 controls http://i108.photobucket.com/albums/n30/HornetAoE/SSA52195.jpg as you can see the wiring goes from the term block to the cabinet controls then the wiring for the Dreamcast goes from the block to the pad which is then plugged into the dreamcast through the light grey wire you can just make out that runs inside the cabinet and out the bottom. The other wires going off to the middle of the screen from the block are for the I-Pac and then into the PC.
I was thinking of splitting the original control wires and using two term blocks which i am pretty sure would solve this although splitting the cable is not ideal as it would weaken it and i dont want to keep rewiring it.
Hope this helps any ideas?

moloch:
The only part I am confused about is that the i-Pac should get its power from the usb so that should be independent.

I am not an electrical expert and from what I see it looks like this....(see attached pdf)

I am not sure where the draw is coming from then.

I am sorry I am not familiar enough with those control panels.

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