> > In this case you have a black box with two inputs and one output: > > I think the coin switch plays a role, too. And I think you haven't seen it in the > schematics, because in the one I posted some time ago there was a connection missing. > > Here's the most recent one: > http://img2.imagetitan.com/img.php?image=33_pong355.png
The coin switch looks wrong. With this circuit you would be able to connect a TTL output directly to GND: ![](//www.mameworld.info/ubbthreads/images/graemlins/firedevil.gif)
Unrelated to burning TTL circuits alive: I really do not see any necessity here to solve any differential equations in the complex plane (Current, Voltage). If this would be anywhere near economically feasible it would be in the mame discrete emulation by now.
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