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N-key rollover

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This is a feature that certain keyboards have that let the keyboards register each key regardless of other keys being pressed. It is required for Plover. Read the link) article about Rollover.

How do I know if my keyboard has N-Key Rollover (NKRO)?

A simple test is to open up a text editor and--while holding down both shift keys--type each letter on your keyboard. If all keys are typed into the text editor, your keyboard probably has nkro.

This site provides a web application that lets you test your keyboard's capabilities for registering multiple key presses. To test, click where it says "click to use", then each key you press lights up green in the picture of a keyboard. Press the middle row keys asdfjkl; and with a normal keyboard only 6 of the 8 keys will light up green, maybe fewer, but if your keyboard has n-key rollover, all 8 will light up green. Then press other multiple-key combinations such as yuhj and see if they all light up green.

What if my keyboard is not capable of nkro?

If you don't have a keyboard that's capable of nkro, but still want to give Plover a try, you can arpeggiate/roll the keyboard chords. More info can be found at the bottom of this post:

Known supported keyboards

The Zalman ZM-K600S and Filco Majestouch are confirmed to have at least 16-key rollover over USB. Some of the other keyboards are known not to have usable rollover over USB, though they will probably have sufficient rollover over PS2.

The USB HID drivers in most computers' BIOS (and in the Linux GRUB bootloader) can not read the NKRO HID reports, and only work when the keyboard is in 6KRO mode. NKRO USB keyboards have switches for changing from BIOS compatible 6KRO mode to full NKRO mode. Some have toggle switches on the keyboard housing, and others have hot-key combinations for switching modes. For example, the Noppoo Choc-84 / N-Key-USB powers on in 6KRO mode, and pressing Fn-F12 switches it to NKRO. It will remember that setting as long as it has power to the USB port while the computer is off. If it does not function correctly after switching it, try pressing Caps_Lock twice after changing to NKRO mode. It presents a different HID ID for each mode. Some keyboards change modes with Fn-Del-6 and Fn-Del-n.

Type Manufacturer Product Name Comments Price
Qwertz Lioncast LK10 NKRO over USB 30€
Qwerty Zalman ZM-K600S NKRO over USB $40
Qwerty Cooler Master CM Storm Quickfire TK NKRO over USB $85
Qwerty Corsair Vengeance K65 NKRO over USB $90
Qwerty Noppoo Choc NKRO over USB $95
Qwerty Logitech G710+ NKRO over USB $130
Qwerty Filco Majestouch-2 NKRO over USB $167
Qwerty Das Keyboard Model 4 NKRO over USB $169
Qwerty SteelSeries Apex m-800 NKRO over USB $199
Qwerty Matias Ergo Pro NKRO over USB $200
Qwerty Ultimate Gadget Labs Ultimate Hacking Keyboard NKRO over USB $250
Qwerty Ergodox Ergodox NKRO over USB $295
Qwerty Keyboardio Keyboardio NKRO over USB $329

Confirmed working steno machines

See also FAQ#What hardware is needed to use Plover?

Plover supports several protocols that are in use by various machines. This means that, in theory, many machines work with Plover. But these machines have been confirmed by users to work with Plover after actually trying it.

Manufacturer Product Name Comments
Utopen Stenoboard Open source hardware
Scott Urueta SOFT/HRUF Open source hardware (see Google Groups thread for updates)
Neutrino Group Revolution Grand
Neutrino Group Infinity Ergonomic
Neutrino Group Infinity Genesis On linux, /dev/ttyUSB1 is a good bet. Set the protocol to Gemini PR.
Neutrino Group Gemini2
Stenovations Lightspeed
Stenograph Stentura 400 SRT
Stenograph Protege
Stenograph Wave
Stenograph Elan Cybra Student Instructions
Word technologies Tréal
Advantage Software Passport
ProCAT Flash Writer Confirmed on Windows and Mac

See also Steno Machine Notes