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Hi!
I don't know NES, but I have interfaced SNES controllers which according
to various Web pages are exactly the same but with 16 bits instead of 8.
The timing diagram you linked to looks exactly like what I did, modulo
perhaps having one or the other signal at the wrong polarity or perhaps
wrong wires connected.

One thing comes to mind: it looks like A is the very first button
transmitted, and you say A can be detected but the others can't. Are you
sure you don't have latch and clock swapped? If you did, each clock
cycle would end up firing latch instead which would mean you'd be
reading the value of button A for every clock cycle instead of stepping
through the buttons.

Good luck,
Chris

threewheeler7 wrote:
|
|
| On 14/01/2008, threewheeler7 <threewheeler7@hotmail.com> wrote:
|
|> this has been kind of frustrating me, this is just simply to test an nes
|> controller
| [...]
|
| And the problem is what?
|
| im sorry. i can only get it to display when "a" is pressed. btw all the
| controller is is a CD4021 - 8 Bit shift register.
|
|

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