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@@ -1,2 +1,18 @@ -# nes-input-test -Simple NES/Famicom ROM to test different input accessories +# NES Input Test ROM +This is simple NES/Famicom ROM to test different input accessories. + +After standard strobe on $4016.0 it reads $4016.0-$4016.7 and $4017.0-$4017.7 (yes, all 8 data lines including not connected on most consoles) 24 times (yes, not only 8 times). So you can test and reverse-engineer almost any input device. This ROM optimized to update screen with all 384 bits every frame. + +## Examples +NES Four Score: + +![NES Four Score](screenshots/four_score.png) + +You can see signature in third byte on $4016.0 and $4017.0 and pressed buttons on the first two bytes. + + +Hori 4-Players Adapter: + +![Hori 4-Players Adapter](screenshots/hori4.png) + +Same here but using D1 line. You can see signature in third byte on $4016.1 and $4017.1 and pressed buttons on the first two bytes. |