Now type slowly for me. I do not know the jargon.
Have never owned or played these video game consoles.
via google I do now know the difference between Street Fighter and Strip Fighter!
Yes the power bypass capacitors for each IC is important. The IC data sheets call for them to be used.
Is the assumption correct that a standard, off the shelf controller does not display the same effects when plugged in with the game console power ON?
And commercial controllers still operate the game console OK?
For now lets forget the events when the controller is plugged hot. I mean plug in the controller and power up the game console. And only test 2-3 button mode. No 6 button mode yet. Initially had all the configuration jumpers between pins 1 & 2 - so basic operating mode.
How does the PCB work under these conditions?
Would it be possible to assemble another PCB without the extra components for the 6 button operation? Mainly do not populate U3 & U4.
Just to keep their loads off the J1.6 SEL input.
Also be possible to verify static operation? To start:
Not connected to the game console.
Just connect +5V power & ground to J1.1 & J1.8 respectively.
All configuration jumpers ( J2, J3, J5, J6 ) pin1 to pin 2.
No connection to J4.
Measure the outputs with a volt meter ( J1.2, J1.3, J1.4, J1.5)
Like this would expect all outputs to be near zero volts.
Now connect J1.7 ( CLR ) to ground. Would expect all outputs to be near 5V.
Actuate button inputs ( tie to ground ) UP, RIGHT, DOWN, LEFT one at a time and measure all 4 outputs each time.
Here would expect measurements to be:
UP ( J4.7) - D0 low, all others high
RIGHT ( J4.
- D1 low, all others high
DOWN ( J4.9) - D2 low, all others high
LEFT ( J4.10) - D3 low, all others high
Connect J1.6 ( SEL ) to ground.
Repeat measurements using button inputs I ( J4.3), II ( J4.4), SEL ( J4.5), RUN ( J4.6).
Have you found the logic probe?