> The coin switch looks wrong. With this circuit you would be able to connect a TTL > output directly to GND:
The coin switch is right. It's quite common to use this setup of two inverters to kill noise while opening or closing a switch. The left inverter has about 14 ns of short circuit before it goes low on the output, driven by the right inverter's high ouput.
> 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.
Ok.
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