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geekhack Community => Keyboards => Topic started by: xpurpleturtlex on Mon, 11 May 2015, 08:39:31

Title: IBM model M
Post by: xpurpleturtlex on Mon, 11 May 2015, 08:39:31

hey im new here and i was just wondering if someone could help me:

im playing this game called osu.. and when im pressing the buttons 4 at once just 2 of them work is there a way that this could have been changed so i could press more buttons at once or do i have to live with it?

Title: Re: IBM model M
Post by: Lurch on Mon, 11 May 2015, 08:45:47

Welcome! Model M's have two-key rollover.

"A keyboard with "two-key rollover" can reliably detect only any two keys used simultaneously; in other words, a user can hold down any key on the keyboard and press a second key, and be sure that the keypress is correctly detected by the computer. However, if the user has two keys depressed and attempts to strike a third key, the third keypress may create a "phantom key" by shorting out the switch matrix."

Source: http://en.wikipedia.org/wiki/Rollover_%28key%29

Title: Re: IBM model M
Post by: E TwentyNine on Mon, 11 May 2015, 08:52:28

If you can use different keys you can find a combination.

Get the file linked here: https://geekhack.org/index.php?topic=34670.msg641440#msg641440

And try combos.  For four keys, QWER, ASDF, ZXCV  work,  as do UIOP, JKL;, M,./

(edit: punctuation...)

Title: Re: IBM model M
Post by: Xonar on Mon, 11 May 2015, 08:53:02

It appears you require a Model F, which has unlimited (NKRO) because of it's capacitive sensing PCB. 

Welcome to WalletHack!  ;)

Title: Re: IBM model M
Post by: xpurpleturtlex on Mon, 11 May 2015, 09:07:07

thanks for the help :D i found out a way that 4 keys work at the same time