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Dreamcast and Mame cabinet

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moloch:
actually after looking at the photo a bit more it may be that you can put a Diode in place on the 5v line that connects through the panel and that would block the dreamcast pad from drawing on it. Again I am still guessing a bit here.

Miller:
Im no expert either but its definatly the Dreamcast pad thats causing the problems, if you look in the picture at the bottom terminal you can see ive disconnected a green wire out of the block this is from the Dreamcast and the I-Pac is now getting 5V for that button, also i have 3 independent buttons that dont use the term blocks (not shown) instead they go straight to the I-Pac and they also are getting 5V.
I think because the two wires are connected together some of the I-Pac volts (3.75V) are going to the dreamcast pad instead of getting to the controls, just cant see an easy way round it.

moloch:
A diode would block the current flow to the dreamcast pad or if it is a zeener diode I think that it will limit it.

http://en.wikipedia.org/wiki/Diode

Plus I am going to guess that if you disconnect that green wire it will not work, right?

Miller:
Disconnecting the green wire stops the Dreamcast button working but lets the I-Pac get the 5V it requries for that button, reconnecting it reduces the I-Pac voltage to 1.25V which is not enough to work however the Dreamcast will be working again.
I did a bit of an introdution to electronics a while ago and remember (i think) that transistors in parallel stop voltages dropping but no idea how to incorperate into this. Although i think you might be right with the diode thing, need to look into it a bit and have a play around with the controls.

moloch:
Do you know where I can see a schematic of this type of cabinet? That will help me a bit too.

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