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PostPosted: Fri Dec 21, 2018 12:49 pm 
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Joined: Fri Dec 21, 2018 12:42 pm
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I want to build a controller from scratch (not just painting an existing one) and was wondering if it's possible to brick my console of I messed something up. Does anyone know specifically what I should be careful of?

Side note can I use any 4021 shift register, there seems to be a lot of different codes , as far as I know they're all the same in function but any knowledge on this would also help. The one I'm looking at is CD4021BCN. Thanks.


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PostPosted: Fri Dec 21, 2018 12:57 pm 
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Joined: Sun Jan 22, 2012 12:03 pm
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Location: Canada
Yes, if you shorted some wires or otherwise sent too much current through the controller port you could damage it. (Example: I've heard pressing start on a Genesis controller plugged into a C64 does horrible things to it.)

I don't think every possible version of 4021 ICs are valid, but if it's made for 5V operation then it should be fine.


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PostPosted: Fri Dec 21, 2018 1:39 pm 
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Joined: Sun Apr 13, 2008 11:12 am
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Location: Seattle
There's only one "generation" of 4000 series ICs, unlike 7400 series ICs. 4000 series ICs are always CMOS, are always comparatively slow, are always capable of operating on 3 to 15V.


The NES controller port is not the best engineered for safety.

1- As always, be careful about not shorting +5V to ground. Inside the NES (right? not famicom?) mainboard, there's no overcurrent protection at all. This is actually less dangerous than:

2- Several of the pins connect straight to the NES's CPU, without any more protection beyond over- and under- voltage protection diodes. Shorting "OUT" or "CLK" to any other pin could kill your NES.


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