Ok guys, I'm trying to build a slightly modified version of this :
NES adapter
I'm just trying to convert the button presses from the NES controller into a basic parallel output (i.e. what the neogeo uses) so I can interface it with a UPCB.
Toodles' UPCB
I've built the circuit, minus the part that converts the digital signal to analog, which includes d1-4; R5, 6, and 7; and Q1 and 2.
When testing the circuit, the output lines go low only when A is pressed. No other button does anything, and button A triggers all outputs. Anyone have any clue what I did wrong?
Thanks.
NES adapter
I'm just trying to convert the button presses from the NES controller into a basic parallel output (i.e. what the neogeo uses) so I can interface it with a UPCB.
Toodles' UPCB
I've built the circuit, minus the part that converts the digital signal to analog, which includes d1-4; R5, 6, and 7; and Q1 and 2.
When testing the circuit, the output lines go low only when A is pressed. No other button does anything, and button A triggers all outputs. Anyone have any clue what I did wrong?
Thanks.