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twist:
I am using a compaq keyboard for my control panel. I'm not sure how to tell the 2 different rows.

Here are some pics:
http://www.f.bz/DCP_0052.JPG
http://www.f.bz/DCP_0053.JPG
http://www.f.bz/DCP_0054.JPG
http://www.f.bz/DCP_0055.JPG


I think that the first 4 and last 4 is the small group, and the 17 in the middle is the big group. See how, on the last picture, the first 4 are not connected, and the last 4 are not connected.

Also, on the other matrix sheet (with the buttons), only those 8 are connected; so I figured that's what it is.

Am I right?

twist:
Anyone? Any help?  ???

JustMichael:
Normally, one sheet of mylar connects to one side of the matrix and the other sheet of mylar connects to the other side of the matrix.
You will need to find where on the mylar the key you want is at and then trace it back to where it connects to the pcb on each sheet of mylar.  Connecting these two points on the pcb will act like that key is being pressed.

If you are going to use this on a 1-player cab with a couple buttons then it will most likely work quite well (and cheap too).

If you are trying to do this for a 2-player Street Fighter style controls then you will in all likelyhood have problems with keys not getting recognized because of too many keys being pressed at once.  An I-PAC would be a far better choice for such a control setup.

twist:

--- Quote ---Normally, one sheet of mylar connects to one side of the matrix and the other sheet of mylar connects to the other side of the matrix.
You will need to find where on the mylar the key you want is at and then trace it back to where it connects to the pcb on each sheet of mylar.
--- End quote ---

u_rebelscum:

--- Quote ---it's only going to be a 1 player thing, with 6 buttons and 1 joystick. Is that OK?
--- End quote ---

Most keyboards, even if you get around ghosting, can only handle 4 keys pressed at the same time, even though the original IBM PC keyboard spec called for 6.  With a 4 key limit, you can only get two buttons + a diagonal on the joystick at a time.  With a 6 key limit, you can get a diagonal and 4 buttons at a time (if you can find the correct keys to solder to get around the ghosting problems).

I bet the compaq keyboard has a cheap encoder with a four key limit.  So probably not okay. :(

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