HHKB Professional

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PFU HHKB Professional
Manufacturer PFU
Layouts
  • 60 (Modified US ANSI)
  • 69 (Modified JP JIS)
Keyswitches Topre
Interface USB
Weight 520g - 1100g
Years of production 2003 - current
Price $200+

The Happy Hacking Keyboard (HHKB) Professional is a range of Happy Hacking Keyboards that use Topre electrostatic capacitive switches in place of membrane rubber domes. The professional range was introduced in 2003.

Description

All Happy Hacking Keyboard Professional keyboards come with DIP switches on the back of the keyboard along with detachable connector (to computer or host machine) unlike the Lite variants which feature non-detachable cable.

This range comprises the following keyboards:

HHKB Professional Series

PFU Model Number Model Name USB Hub Number of Keys Layout Key Weight Total Weight (without cable) Spacebar material Enclosure Colour Key Colour Printed legends Release Date Availability
PD-KB300 HHKB Professional No 60 Modified US ANSI Uniform 45g 520g ABS White White Yes 2003-04-24 Not readily available.
PD-KB300B HHKB Professional No 60 Modified US ANSI Uniform 45g 520g ABS Charcoal gray Charcoal gray Yes 2003-04-24 Not readily available.
PD-KB300NL HHKB Professional No 60 Modified US ANSI Uniform 45g 520g ABS White White No 2003-04-24 Not readily available.
PD-KB300BN HHKB Professional No 60 Modified US ANSI Uniform 45g 520g ABS Charcoal gray Charcoal gray No 2003-04-24 Not readily avilable.
PD-KB400W HHKB Professional 2 Yes 60 Modified US ANSI Uniform 45g 530g ABS White White Yes 2006-03-24 Available Japan US
PD-KB400WN HHKB Professional 2 Yes 60 Modified US ANSI Uniform 45g 530g ABS White White No 2006-03-24 Available Japan US
PD-KB400B HHKB Professional 2 Yes 60 Modified US ANSI Uniform 45g 530g ABS Charcoal gray Charcoal gray Yes 2006-03-24 Available Japan US China/Japan/Europe/US Worldwide
PD-KB400BN HHKB Professional 2 Yes 60 Modified US ANSI Uniform 45g 530g ABS Charcoal gray Charcoal gray Yes 2006-03-24 Available Japan US
PD-KB500W HHKB Professional HG Yes 60 Modified US ANSI Uniform 45g 1100g ABS? Unpainted aluminium White Yes 2006-10-12 Not readily available.
PD-KB500WN HHKB Professional HG Yes 60 Modified US ANSI Uniform 45g 1100g ABS? Unpainted aluminium White No 2006-10-12 Not readily available.
PD-KB500B HHKB Professional HG Yes 60 Modified US ANSI Uniform 45g 1100g ABS? Unpainted aluminium Charcoal gray Yes 2006-10-12 Not readily available.
PD-KB500BN HHKB Professional HG Yes 60 Modified US ANSI Uniform 45g 1100g ABS? Unpainted aluminium Charcoal gray No 2006-10-12 Not readily available.
PD-KB500J HHKB Professional HG JAPAN Yes 60 Modified US ANSI Uniform 45g 1100g ABS? Unpainted aluminium Wajima style lacquer with gold dust sprinkling No 2006-10-12 Not readily available.
PD-KB420W HHKB Professional JP No 69 Modified JP JIS Uniform 45g 520g PBT White White Yes 2008-11-10 Available Japan
PD-KB420B HHKB Professional JP No 69 Modified JP JIS Uniform 45g 520g PBT Charcoal gray Charcoal gray Yes 2008-11-10 Available Japan
PD-KB400WS HHKB Professional 2 Type-S Yes 60 Modified US ANSI Uniform 45g 530g ABS White White Yes 2011-06-15 Available Japan US
PD-KB400WNS HHKB Professional 2 Type-S Yes 60 Modified US ANSI Uniform 45g 530g ABS White White No 2011-06-15 Available Japan US
PD-KB420WS HHKB Professional JP Type-S No 69 Modified JP JIS Uniform 45g 520g PBT White White Yes 2011-06-15 Available Japan
PD-KB600B HHKB Professional BT No 60 Modified US-ANSI Uniform 45g 531g ? White White Yes 2016-04
PD-KB600B HHKB Professional BT No 60 Modified US-ANSI Uniform 45g 531g ? Charcoal grey Charcoal gray Yes 2016-04
PD-KB600BN HHKB Professional BT No 60 Modified US-ANSI Uniform 45g 531g ? White White Yes 2016-04
PD-KB600BN HHKB Professional BT No 60 Modified US-ANSI Uniform 45g 531g ? Charcoal grey Charcoal gray Yes 2016-04
PD-KB620B HHKB Professional BT No 69 Modified JP JIS Uniform 45g 545g ? White White Yes 2016-04
PD-KB620B HHKB Professional BT No 69 Modified JP JIS Uniform 45g 545g ? Charcoal grey Charcoal gray Yes 2016-04
PD-KB401W HHKB Professional Classic No 60 Modified US-ANSI Uniform 45g 530g PBT White White Yes 2019-12-10 Available PFU Direct China/Japan/Europe/US Worldwide
PD-KB401B HHKB Professional Classic No 60 Modified US-ANSI Uniform 45g 530g PBT Charcoal grey Charcoal gray Yes 2019-12-10 Available PFU Direct China/Japan/Europe/US Worldwide
PD-KB401WN HHKB Professional Classic No 60 Modified US-ANSI Uniform 45g 530g PBT White White No 2019-12-10 Available PFU Direct China/Japan/Europe/US Worldwide
PD-KB401BN HHKB Professional Classic No 60 Modified US-ANSI Uniform 45g 530g PBT Charcoal grey Charcoal gray No 2019-12-10 Available PFU Direct China/Japan/Europe/US Worldwide
PD-KB800W HHKB Professional HYBRID No 60 Modified US ANSI Uniform 45g 540g PBT White White Yes 2019-12-10 Available Amazon.jp China/Japan/Europe/US Worldwide
PD-KB800B HHKB Professional HYBRID No 60 Modified US ANSI Uniform 45g 540g PBT Charcoal gray Charcoal gray Yes 2019-12-10 Available Amazon.jp China/Japan/Europe/US Worldwide
PD-KB800WN HHKB Professional HYBRID No 60 Modified US ANSI Uniform 45g 540g PBT White White No 2019-12-10 Available Amazon.jp China/Japan/Europe/US Worldwide
PD-KB800BN HHKB Professional HYBRID No 60 Modified US ANSI Uniform 45g 540g PBT Charcoal gray Charcoal gray No 2019-12-10 Available Amazon.jp China/Japan/Europe/US Worldwide
PD-KB800WS HHKB Professional HYBRID Type-S No 60 Modified US ANSI Uniform 45g 540g PBT White White Yes 2019-12-10 Available Amazon.jp China/Japan/Europe/US Worldwide
PD-KB800BS HHKB Professional HYBRID Type-S No 60 Modified US ANSI Uniform 45g 540g PBT Charcoal gray Charcoal gray Yes 2019-12-10 Available Amazon.jp China/Japan/Europe/US Worldwide
PD-KB800WNS HHKB Professional HYBRID Type-S No 60 Modified US ANSI Uniform 45g 540g PBT White White No 2019-12-10 Available Amazon.jp China/Japan/Europe/US Worldwide
PD-KB800BNS HHKB Professional HYBRID Type-S No 60 Modified US ANSI Uniform 45g 540g PBT Charcoal gray Charcoal gray No 2019-12-10 Available Amazon.jp China/Japan/Europe/US Worldwide
PD-KB800YS HHKB Professional HYBRID Type-S Snow No 60 Modified US ANSI Uniform 45g 540g PBT Pure White Pure White Yes 2021-11-16 Available China/Japan/Europe/US
PD-KB820W HHKB Professional HYBRID No 69 Modified JP JIS Uniform 45g 550 g PBT White White Yes 2019-12-10 Available Amazon.jp Japan
PD-KB820B HHKB Professional HYBRID No 69 Modified JP JIS Uniform 45g 550 g PBT Charcoal gray Charcoal gray Yes 2019-12-10 Available Amazon.jp Japan
PD-KB820WS HHKB Professional HYBRID Type-S No 69 Modified JP JIS Uniform 45g 550 g PBT White White Yes 2019-12-10 Available Amazon.jp Japan
PD-KB820BS HHKB Professional HYBRID Type-S No 69 Modified JP JIS Uniform 45g 550 g PBT Charcoal gray Charcoal gray Yes 2019-12-10 Available Amazon.jp Japan
PD-KB820YS HHKB Professional HYBRID Type-S Snow No 69 Modified JP JIS Uniform 45g 550 g PBT Pure White Pure White Yes 2021-11-16 (?) Available Japan

HHKB Professional[1]

The layout of the professional carries on the tradition of the ANSI layout with the inverted trapezoid shape for the modifiers versus the alphanumeric keys. It was the first keyboard by PFU to be introduced with Topre switches (electrostatic capacitive non-contact technology[2]) as opposed to rubber dome over membrane which was a feature in Happy Hacking Keyboard as well as Happy Hacking Keyboard Lite.

In addition to the use of Topre switches, Happy Hacking Keyboard Professional uses a USB connector[3] which differs from PS/2 connectivity on the Happy Hacking Keyboard Lite as well as the various connectivity that was offered on Happy Hacking Keyboard.

The white variant keyboard was priced at ¥25,000 (Japanese Yen) from PFU Direct[4], whereas the charcoal gray variant was priced at ¥24,990 (Japanese Yen) from PFU Direct.[5]

The white variant series was introduced in April 24, 2003 and was discontinued at an unspecified date.[6] The charcoal gray variant series was introduced in Feburary 14, 2005 and was discontinued at an unspecified date.[7] However according to PFU Systems (formerly known as PFU America), the Happy Hacking Keyboard Professional range was discontinued on December 10, 2006, the same day as PFU Systems discontinued Happy Hacking Keyboard.[8] On the contrary, there has been no documentation pertaining the launch dates of let alone the price for Happy Hacking Keyboard Professional in the US.

Charcoal gray variant was noted to be using sublimation technology on the keycaps.[9]

Further specific information in regards to HHKB Professional can be found here (Japanese only).

Some of the information pertaining to Happy Hacking Keyboard Professional was made available in English on PFU Systems (formerly PFU America) website. It was later removed for an unknown reason:

HHKB Professional JP Series

HHKB Professional JP[10]

The JP layout uses the layout that is known as JIS (short for Japan Industrial Standard). The layout does not follow what Dr. Wada had originally with the Pro series as in specifically to do with the inverted trapezoid layout. However one thing that shares the common similarities with Professional versus Professional JP is the lack of USB hub as featured on Professional 2 series.

JIS layout adds extra keys which are not normally found on the Professional/Professional 2 series. These keys are mainly specific for inputting Japanese characters such as henkan, muhenkan, kana, etc. Along with the Professional JP re-introduces the arrow keys that are not available as a dedicated key on the Professional/Professional 2 series. It also adds extra few keys that are not found on ANSI variant such as right Control key for instance.

The JP layout is available as a 69 keys variant as opposed to the 60 keys variant found on the ANSI variant. Only very few key caps are cross compatible (modifier-wise). Also for the JP layout comes the lack of option for unlegended keys.[11]

The HHKB Professional JP was introduced on November 10, 2008 and is priced at ¥24,990 (Japanese Yen). At the time of the announcement the HHKB Professional JP keycap sets were also spontaneously released with the keyboard as an optional accessory.

HHKB Professional JP Type-S (silenced switches)[12]

The Professional JP Type-S follows the layout found on HHKB Professional JP however with the added silencing on the plunger/slider. Type-S also bears the insignia on the top right of the keyboard along with extra lettering on the model number.

HHKB Professional JP Type-S was introduced on June 15, 2011 in conjunction with the HHKB Professional 2 Type-S.

HHKB Professional HG Series[13]

The HG Series was introduced for a limited time to celebrate 10th anniversary of the Happy Hacking Keyboard series since the introduction in 1996. This series features a distinct machined aluminium frame made to order for the keyboard, a small wooden box containing the tools along with legs for adjusting the height of the keyboard (up to eight height levels as opposed to three), as well as laser engraving with owner's name on the back of the keyboard. In addition to all this, the HHKB Professional HG was also packaged in a distinct box that is very different from the rest of the boxes that were used in HHKB keyboards. All the keyboards featured in this range are all based on HHKB Professional layout, in other words ANSI layout.[14]

The HHKB Professional HG series was introduced October 12, 2006 and was discontinued on July 31, 2007.[15] PFU announced the discontinuation of HHKB Professional HG on July 17, 2007.[16]

HHKB Professional HG

The HG was available with four variants.[17] They were priced around ¥262,500 (Japanese Yen) according to PFU Direct website.[18]

HHKB Professional HG JAPAN

In addition to the Professional HG, there's also the Professional HG JAPAN. The HG JAPAN features a wajima style lacquer resin on the (mostly) PBT keys to produce a distinct colour unique to Professional HG JAPAN along with gold dust sprinkled on top of each and every key. The key that was used as a basis for coating the wajima style lacquer were charcoal coloured key caps.[19][20]

The HHKB Professional HG JAPAN series was made in collaboration with Toru lacquerware workshop and was said that it was "a fusion of traditional craft and IT".

It was priced at ¥525,000 (Japanese Yen) according to PFU Direct website.[21]

HHKB Professional 2 Series

The Professional 2 series entails a USB hub added to the back of the keyboard for plug-and-play of various USB devices whilst retaining the same layout that Dr. Wada inspired. The USB ports for external USB devices are only offered 100mA and comply with USB2.0 as well as USB1.1 specifications.

The HHKB Professional 2 series was introduced on March 16, 2006 with the exception of Type-S which was introduced at a later date in conjunction with HHKB Professional JP Type-S.

HHKB Professional 2[22]

The Professional 2 keyboard goes back to Dr. Wada's keyboard layout, however it adds USB hubs on the back of Happy Hacking Keyboard for added convenience along with EU directive compliance for environmental standards (complies with RoHS).

The HHKB Professional 2 is priced at ¥24,990 and was on sale from March 24, 2006.

HHKB Professional 2 Type-S (silenced switches)[23]

The Professional 2 Type-S keyboard extends the functionality of Professional 2 keyboard by implementing the silencing on the slider/plunger.

HHKB Professional 2 Type-S was introduced on June 15, 2011 in conjunction with the HHKB Professional JP Type-S.

HHKB Professional BT

The HHKB Professional BT uses Bluetooth 3.0, but can also be connected with USB (Micro-B port under a hatch). It comes in classic printed, classic blank and JP layouts in white/grey and charcoal gray. There are no sound-damped (Type-S) versions. The "JP" moniker has been dropped for Japanese layouts.

The case design has been updated with thinner case top, slightly rounder edges and modified slope of front and back sides. Two AA batteries are hosted in a cylindrical bump at the back. The logo on the JP versions has been moved from the front to the top, but keyboards with the classic layout has the logo below the right Shift as usual. There is also an indicator LED for pairing and connection. Alkaline batteries are estimated to last three months.[24]

HHKB Professional Classic series[25]

The keyboard now has a detachable USB Type C connector and a slightly updated case design, obviously based on the HHKB Professional BT, except that there is no battery bump and it has a Type C connector (without a covering hatch). There is no USB hub. The logo has been moved to the top, and there is an indicator LED for Caps Lock. (instead of Bluetooth or battery status, because it has none of these)

Four variants with printed/blank legends in white/charcoal grey became available in 2019-12-10 for order on PFU Direct only. There are no sound-damped (Type-S) versions.

HHKB Professional HYBRID series[26][27]

Keyboards in the Professional HYBRID and Professional HYBRID Type-S (silenced) series support both Bluetooth and USB (hence the "hybrid" moniker). The Bluetooth version is 4.2 LE (Bluetooth 3.0 in previous models), and the USB port is Type C.

Up to four Bluetooth hosts can be paired, with fast switching between them or USB. In Bluetooth mode, the keyboard is powered by two standard AA batteries. Alkaline batteries are estimated to last three months. When a USB cable is used the keyboard does not draw power from batteries, and it is not able to charge batteries either. There is no USB hub.

The case designs is similar to the HHKB Professional BT, but with a shorter battery bump and equipped with an exposed Type-C port. The logo has been moved to the top on all model variants, and there is an bi-colour LED for connection and battery status.

The keyboard supports simple key remapping in a Microsoft Windows or macOS program when connected via a USB cable. The mappings are stored on the keyboard and can be used in Bluetooth mode. Three different layouts can be stored by using combinations of the first two DIP switches (off-off, on-off and off-on). The remaining four DIP switches configure mostly the modifier/function keys and override these keys in any user-created layout.

Twelve models (Normal/Type-S, White/Charcoal grey, Printed/Blank/Japanese) were introduced on December 10, 2019. There is no "JP" moniker for keyboards with Japanese layout.

HHKB Professional HYBRID

Has non-silenced Topre switches. The same name is used for modified US-ANSI ("Unix layout") and modified JIS layout.

HHKB Professional HYBRID Type S

Has silenced Topre switches, with a ring that dampens noise when a key is released. The same name is used for modified US-ANSI ("Unix layout") and modified JIS layout.

Topre Keycap Set Reference

Most of the Happy Hacking Keyboard Professional series keyboards are compatible with Topre Realforce keycaps with some minor exceptions:

  • Realforce 89/91/106/108 (Model numbers: SA0100KT*) are compatible for most keys except most modifiers.
  • Realforce 87/104 (Model numbers: XF0100KT*) are compatible for most keys except the legends would be different for some modifiers.
  • Happy Hacking Keyboard Professional JP owners may find less suitable modifiers for use from Topre keycap sets.

PFU also announces the dates for keycap sets for HHKB range.

  • HHKB Professional keycap sets were introduced on September 16, 2008.
  • HHKB Professional JP keycap sets were introduced on November 10, 2008 in conjunction with the release of HHKB Professional JP series.

Full sets

Topre Model Number Key Labelling Colour Compatibility Contents Availability
PD-KB400KTB Sublimation Black All ANSI HHKB Pro 60 Keys [ANSI], Keypuller Available Japan US
PD-KB400KTBN Blank Black All ANSI HHKB Pro 60 Keys [ANSI], Keypuller Available Japan US
PD-KB400KTW Sublimation White All ANSI HHKB Pro 60 Keys [ANSI], Keypuller Available Japan US
PD-KB400KTWN Blank White All ANSI HHKB Pro 60 Keys [ANSI], Keypuller Available Japan US
PD-KB420KTB Sublimation Black All JIS HHKB Pro 69 Keys [ANSI], Keypuller Available Japan
PD-KB420KTW Sublimation White All JIS HHKB Pro 69 Keys [ANSI], Keypuller Available Japan
SA0100KT1 Sublimation White Realforce 89/91/106/108 108 Keys [JIS] Available Japan
SA0100KT2 Sublimation Blue Realforce 89/91/106/108 108 Keys [JIS] Available Japan
SA0100KT3 Sublimation Red Realforce 89/91/106/108 108 Keys [JIS] Available Japan
SA0100KT4 Sublimation Yellow Realforce 89/91/106/108 108 Keys [JIS] Available Japan
SA0100KT5 Sublimation Orange Realforce 89/91/106/108 108 Keys [JIS] Available Japan
SE09E0-KTF1 Sublimation Pink (Cherry Blossom) Realforce 87/104 107 Keys [ANSI] Available US Korea
SE09E0-KTF1N Blank Pink (Cherry Blossom) Realforce 87/104 107 Keys [ANSI] Available US
XF0100KT1 Sublimation White Realforce 87/104 107 Keys [ANSI] Available Korea
XF0100KT11 Sublimation Lime Realforce 87/104 107 Keys [ANSI] Available Korea
XF0100KT11N Blank Lime Realforce 87/104 107 Keys [ANSI] Not Readily Available
XF0100KT1N Blank White Realforce 87/104 107 Keys [ANSI] Available US
XF0100KT2 Sublimation Blue Realforce 87/104 107 Keys [ANSI] Available US Korea
XF0100KT2N Blank Blue Realforce 87/104 107 Keys [ANSI] Available US
XF0100KT3 Sublimation Red Realforce 87/104 107 Keys [ANSI] Available Korea
XF0100KT3N Blank Red Realforce 87/104 107 Keys [ANSI] Available US
XF0100KT4 Sublimation Yellow Realforce 87/104 107 Keys [ANSI] Available US Korea
XF0100KT4N Blank Yellow Realforce 87/104 107 Keys [ANSI] Available US
XF0100KT5 Sublimation Orange Realforce 87/104 107 Keys [ANSI] Available US Korea
XF0100KT5N Blank Orange Realforce 87/104 107 Keys [ANSI] Available US

Partial sets

Topre Model Number Key Labelling Colour Compatibility Contents Availability
HH-REDARROW Sublimation Red All Realforce Arrow Keys - 1xUp, 1xDown, 1xLeft, 1xRight Available US Korea
HH-REDWASD Sublimation Red All Realforce, All HHKB Pro 1xW, 1xA, 1xS, 1xD [Arrows on Front] Available US Korea
HH-WASD Sublimation Lavender All Realforce, All HHKB Pro 1xW, 1xA, 1xS, 1xD [Arrows on Front] Available US Korea
HH-WASDN Sublimation Lavender All Realforce, All HHKB Pro Arrow Keys - 1xUp, 1xDown, 1xLeft, 1xRight [Arrows on Front] Available US Korea
TMOD-GRN Sublimation Green Realforce 86/87/103/104 2xAlt, 2xCtrl, 2xShift Available US Korea
TMOD-LAV Sublimation Lavender Realforce 86/87/103/104 2xAlt, 2xCtrl, 2xShift Available US Korea
TMOD-ORG Sublimation Orange Realforce 86/87/103/104 2xAlt, 2xCtrl, 2xShift Available US Korea
TMOD-YEL Sublimation Yellow Realforce 86/87/103/104 2xAlt, 2xCtrl, 2xShift Available US Korea
TWASD-GRN Sublimation Green All Realforce, All HHKB Pro 1xW, 1xA, 1xS, 1xD Available US Korea
TWASD-LAV? Sublimation Lavender All Realforce, All HHKB Pro 1xW, 1xA, 1xS, 1xD Available Korea
TWASD-ORG Sublimation Orange All Realforce, All HHKB Pro 1xW, 1xA, 1xS, 1xD Available US Korea
TWASD-YEL Sublimation Yellow All Realforce, All HHKB Pro 1xW, 1xA, 1xS, 1xD Available US Korea
? Sublimation Hangul Black Realforce 86/87/103/104 A-Z, 1xRight Ctrl, 1xRight Alt, 1xPipe/Backslash Available Korea
? Sublimation Hangul White Realforce 86/87/103/104 A-Z, 1xRight Ctrl, 1xRight Alt, 1xPipe/Backslash Available Korea

Single keys

Topre Model Number Key Labelling Colour Compatibility Contents Availability
HH-REDESC Sublimation Red All Realforce, All HHKB Pro 1xEsc Available US Korea
HH-REDESCN Blank Red All Realforce, All HHKB Pro 1xEsc Available US
TENTER-GRN Sublimation Green All ANSI Realforce, All ANSI HHKB Pro 1xEnter Available US
TENTER-LAV Sublimation Lavender All ANSI Realforce, All ANSI HHKB Pro 1xEnter Available US
TENTER-ORG Sublimation Orange All ANSI Realforce, All ANSI HHKB Pro 1xEnter Available US
TENTER-YEL Sublimation Yellow All ANSI Realforce, All ANSI HHKB Pro 1xEnter Available US

Esoterica

The two colours that are available with the keyboard by default are white (白) {hiragana: しろ romaji: shiro} and charcoal gray (墨) {hiragana: すみ romaji: sumi}. The charcoal gray variant is often confused as black (黒){hiragana: くろ romaji: kuro} by unfamiliar people. Charcoal gray variants of the keyboard, like their white coloured counterparts both feature black dye-sublimated legends on the keys. Should the charcoal gray variant be actually black, the black dye-sublimated legends on the keys would be rendered invisible.

Unlike the Lite variants of HHKB series where it would clearly describe white and black clearly, the legends printed on those sets of keys are directly in contrast to each other. That is, white keycaps with black legends and black keycaps with white legends.

Gallery

HHKB Professional PD-KB300NL (blank, white)

HHKB Pro II

See also

External links

References

  1. PFU website - Happy Hacking Professional series released (Japanese only)
  2. PFU website - HHKB Professional leaflet (Japanese only)
  3. PFU website - Press release: Happy Hacking Professional (Japanese only)
  4. PFU website - Press release: Happy Hacking Professional (Japanese only)
  5. PFU website - Press release: Happy Hacking Professional "INK" (Japanese only)
  6. PFU website - Happy Hacking Professional series released (Japanese only)
  7. PFU website - Happy Hacking Professional "INK" series released (Japanese only)
  8. (Wayback machine) PFU Systems - Specifications
  9. PFU website - Press release: Happy Hacking Professional "INK" (Japanese only)
  10. PFU website - Press release: HHKB Professional JP (Japanese only)
  11. PFU website - Happy Hacking Keyboard Professional JP (Japanese only)
  12. PFU website - Press release: HHKB Professional Type-S (Japanese only)
  13. PFU website - Press release: Happy Hacking Keyboard HG (Japanese only)
  14. PFU website - Happy Hacking Professional HG series (Japanese only)
  15. PFU website - HHKB HG series EOL (Japanese only)
  16. PFU website - 2007 News (Japanese only)
  17. PFU website - Happy Hacking Professional HG series (Japanese only)
  18. PFU Direct - Happy Hacking Keyboard Professional HG (Japanese only)
  19. PFU website - Happy Hacking Keyboard Professional HG JAPAN (Japanese only)
  20. PFU website - Happy Hacking Keyboard Professional HG JAPAN collaboration (Japanese only)
  21. PFU Direct - Happy Hacking Professional HG (Japanese only)
  22. PFU website - Press release: HHKB Pro 2 (Japanese only)
  23. PFU website - Press release: HHKB Professional Type-S (Japanese only)
  24. Pic World—HHKB Professional BT – ハッピーハッキングキーボードに Bluetooth 対応モデルが追加されました. Dated 2016-05-06. Retrieved 2019-12-12
  25. Happy Hacking Keyboard web site—[https://happyhackingkb.com/jp/products/classic/ HHKB Professional Classic]. Retrieved 2019-12-10
  26. Happy Hacking Keyboard web site—HHKB Professional HYBRID. Retrieved 2019-12-10
  27. Happy Hacking Keyboard web site—HHKB Professional HYBRID Type-S. Retrieved 2019-12-10