Category: MAME'd Millipede :: 3. Electronics
I've reserved this page for covering anything involving the integration of the emulation system with electronics of the original Millipede system.
At this point there are only a few items to mention. The cabinet is, for the most part, just a shell for holding the emulation system. The control panel is attached to the front but is wired entirely to the interface boards and the computer. The monitor is in the cabinet, of course, but is taking its signal entirely from the computer.
The exceptions to the rule are the new power switched I mounted under the front right edge of the control panel and the sound. The power is a square pushbutton switch with a strong, tactile click when it is toggled. I bought it at Radio Shack (overpriced as usual) and wired it in by putting compatible molex connectors on its wiring to go inline with the cabinet's own A/C feed to its power supply. This allows it to be removed simply by unplugging it and replugging the A/C line to the power supply. No changes were made to the wiring.
The monitor is powered by the cabinet's original A/C line to the original monitor with no differences to speak of. The cabinet power also controls the unmodified marquee lighting and the light bulbs in the coin mechanism.
Further integration takes place with the sound system. I wired the line-level output of the Soundblaster card to the inputs of the cabinet's original amplifier. This allows my emulation system to use the original speakers which are controlled by the cabinet's original volume control knob just inside the coin door. Again, returning the cabinet to the original configuration just involves popping out the molex pins of my emulation audio output and reinstering the pins of the Millipede board's audio output signals.
Aside from this, the original boards (unconnected for preservation) are still in the machine and all of the original wiring harnesses are untouched. I could easily unbolt my control panel, rebolt the original and plug all the harnesses back into their keyed mates. Voila - original Millipede.