Whoops: The NMI line needs to be powered on by individual processors now it's no longer part of the Processor base class.

Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>

M6502/src/mos6502.cpp

@@ -14,6 +14,7 @@ void EightBit::MOS6502::powerOn() {
 	P() = RF;
 	S() = Mask8;
 
+	raise(NMI());
 	raise(SO());
 }
 

Z80/src/Z80.cpp

@@ -28,6 +28,7 @@ void EightBit::Z80::powerOn() {
 
 	IntelProcessor::powerOn();
 
+	raise(NMI());
 	raise(M1());
 
 	di();