NTC KB-6251

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NTC KB-6251
NTC KB-6251EA -- top.jpg
FCC ID FMA44HKB6251 (1988)
FMA44HKB6252EA
Manufacturer NTC
Layouts 101/102-key Asian 101
Keyswitches Alps SKCM Blue
Alps SKCM White
Omron B3G-S series
Cherry MX Blue
Aristotle Cherry MX clone
Mitsumi miniature mechanical
Keycaps Pad-printed, double-shot
Interface XT/AT switchable
Precedes Unikey KWD-601

KB-6251 is a widely-sold family of slimline Alps keyboards from NTC. Current examples found use a bigass enter key and single-unit backspace key. The Alps switches are mounted onto a plastic plate, giving this slimline model a very light weight. A variant with amber Omron B3G-S series switches mounted into a metal plate was also made. Keycaps can be double-shot or, more typically, pad-printed.

The XT/AT switch is unconventionally labelled as "80206/8088" instead of "A/X" (per the NTC KB-6151) or XT/AT.

The version with Windows keys is Unikey KWD-601.

Variants

KB-6251

  • Branded as Champking Computer Co.[1] and Champion Computer Co.[2]
  • Chinese layout, with double-shot English letters and pad-printed Chinese characters
  • Amber Omron B3G-S series switches including space bar, mounted into a metal plate
  • FCC ID FMA44HKB6251

KB-6251/2

  • Listed as "KB-6251/2" on rear label[3]
  • ANSI layout with doubleshot keycaps
  • Alps SKCM White
  • FCC ID FMA44HKB6251

KB-6251/2

  1. Cherry MX Blue[4]
  2. White four-tab clones[5]

KB-6251EA

Plastic plate example

  • Pine Alps SKCM White
  • Found in UK 102-key layout, with no exterior markings of any kind except QC and serial number
  • PCB model NTC 71-6071A-505
  • The official designation is not known, as the rear label is missing; KB-6251EA is the model written on the PCB, which is often incorrect due to different models sharing a single PCB

Metal plate example

A rare version with a black-painted steel plate, and Zeos branding on top.[7]

KB-6251EM

It is possible that the "M" in "EM" stands for "Mitsumi", giving "A" for "Alps" in "EA". Unlike the KB-6151, where "EN" has been seen on an Alps clone version, Alps clone KB-6251 keyboards also use "EA".

KB-6252

KB-6252EA

  • 102-key layout
  • FCC ID FMA44HKB6252EA (not in the FCC's records)
  • Alps SKCM Blue[10] and white Alps switches of unknown variety.[11]

Blue Alps version

White Alps version

KB-6752EA

  • 102-key layout
  • FCC ID FMA44HKB6251
  • Hua-Jie AK series green switches.
  • Desoldered XT/AT switch

Unknown (SFON)

Unknown "KB-6251" with SFON Alps clone switches (no photos were posted as evidence)[12]

Unknown (Optimus KB-6251)

Unknown "KB-6251" sold in Poland under Optimus SA brand[13]

  • Aristotle Cherry MX clone switches[9], plastic plate
  • Big-Ass Enter key and a 1 unit backspace
  • No XT-AT switch
  • FCC ID LIAKB-6251 — this example appears to have been made after this product range was transferred to Unikey (FCC grantee LIA), prior to the model transitioning to the 104/105-key Unikey KWD-601.

References

  1. KBTalking — ⊕⊕Champking KB-6251美容換膚清毒素⊕⊕ (Japanese only)
  2. Sandy — leo_6251ea
  3. Geekhack — My $15 Acquisition
  4. https://geekhack.org/index.php?topic=79814
  5. Overclockers Australia Forums — Cleaning/Restoring my IBM Model M - Page 3 (page 3)
  6. Geekhack — Blue ALPS broke my heart (question about broken keyboard)
  7. Sandy — zeos_6251ea
  8. Imgur — Keyboards (DEAD!)
  9. 9.0 9.1 Geekhack — UNIKEY KB-6252
  10. schlimmfeld — NTC KB6252EA
  11. Deskthority — Keyboard Love story VIII - USPS, Dell, NTC KB-6252EA
  12. 外设天下 — 光头哥求科普:谁来解读APLS??
  13. utensilia.tk Optimus KB-6251