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Help with Keyboard Hack

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onesimo:

i am building an arcade controller with two players 8 buttons each (like the x-arcade) but there are no encoders available here. so i hacked my new keyboard and mapped the matrix. its an 18x8 matrix. but the problem is i dont know which keys to be used.

Tiger-Heli:

First off, where is "here" that there are no encoders available.

Second, there is no way that I know of to reliably get two players 8 buttons each from a keyboard hack.

The best I would reasonably hope for was two players six buttons each from a 16x8 matrix, (or maybe 7 buttons each from a 18x8 matrix.

Third, you don't have an 18x8 matrix, rows 9, 10 and 19 are empty, so you have a 15x8 matrix.
That leaves you with only enough for Player 1 and 6 buttons and Player 2 and 5 buttons and admin buttons.

Fourth, I don't know if the above statement is correct, as I only count 59 instead of the 104-keys.  The arrow keys are missing, as are the function keys, and a lot of others.  If any of these are on the empty rows, that greatly increases what you can do.

Fifth, even though you have mapped out the matrix, you still may have firmware that prevents more than 8 keys from being depressed at the same time.  I can recommend keys and you can test it.

Let me know if you want me to recommend keys based on what you have (2-Player, 6 and 5 buttons) or if you want to test and post a new matrix, or if you want to figure it out for yourself at http://www.mameworld.net/emuadvice/keyhack2.html

brained:

You need to complete the matrix, you got tired mapping the buttons????

Where are you located?, I think ultimarc ships worldwide.

Or if you are a cheapstake like me get you self the LPT Switch, you just need to hack a printer cable, a couple of diodes and connection bars  ;D. You can get 60 inputs with this thingy

Tiger-Heli:


--- Quote from: brained on June 08, 2005, 12:21:44 pm ---Or if you are a cheapstake like me get you self the LPT Switch, you just need to hack a printer cable, a couple of diodes and connection bars  ;D. You can get 60 inputs with this thingy

--- End quote ---
Linky

Gootfu:

Keyboard hack will work with 2 player, 4 buttons each...
any more and you will have problems.

Encoder is the best in my opinion.

I like using Jpac from ultimarc in my Jamma machines.

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