testing keyboard n-key rollover

another update on keyboard

How many simultaneous key presses can your keyboard handle?

Test How Many Keys Can Your Keyboard Register

Here's a test you can do.

Hold down both left Shift key and right Shift key, then press x. See if the letter shows up on your screen.

Yes? Now, try other keys, while keep both the Shift keys depressed. Go through the whole alphabet. Best is to ask your friend to hold both the Shift down, then you press each and every key on your keyboard, and see if they appear on the screen.

On my Microsoft Comfort Curve Keyboard 2000 and Natural Ergonomic Keyboard 4000, when both Shift are held down, the key x and / and 3 does not work!

apple bondi blue imac keyboard
“Apple Bondi Blue iMac keyboard (M2452)”

On my Apple iMac keyboard M2452 (year ~2000), all the top row {Q W E R T Y U I O P [} does not work, except ] and \.

read more at http://xahlee.org/comp/keyboard_key_ghosting.html