Editing Alps SKFR/SKFS series (section)

==Variants==
A number of variants exist. Most of the part numbers are taken from the 1994 Alps catalogue, courtesy of Sandy. Part number SKFRAK has been sighted on the Web, but no details of any kind are known. A switch exists that resembles SKFR but with a taller slider that accepts regular Alps keycaps; this switch has been found only in 1995, and were this to be SKFRAK, the date may explain its omission from the 1994 catalogue.

{| class="wikitable variants-table"
!                                  !! Moniker        !! Model   !! Type   !! Features    !! Sighted
|-
| [[File:Alps SKFRAC.jpg|175px]]   || SKFR Black     || SKFRAC || Linear  ||             || Yes
|-
| [[File:Alps SKFRAD.jpg|175px]]   || SKFR Yellow    || SKFRAD || Linear  || Short depth || Yes
|-
| [[File:No photograph.svg|175px]] || ?              || SKFRAK || Linear  ||             || Uncertain
|-
| [[File:No photograph.svg|175px]] || SKFR Black LED || SKFRFA || Linear  || Red LED     || No
|-
| [[File:No photograph.svg|175px]] || SKFR Black LED || SKFRFB || Linear  || Green LED   || No
|-
| [[File:No photograph.svg|175px]] || SKFR Black LED || SKFRFC || Linear  || Amber LED   || No
|-
| [[File:Alps SKFSAA.jpg|175px]]   || SKFS White     || SKFSAA || Tactile ||             || Yes
|}

===SKFR Black===
This is the linear version. An LED version exists, but this has yet to be sighted. Since there is no LED capacity in the design of SKFR Black, the LED version must take a different form.<ref name="KBT-taller" /><ref name="rzwv-taller" />

The following photos depict a [[Sager NP-925]] laptop keyboard:

<gallery widths=250 heights=187>
File:Alps low-profile black 1.jpg                       | A look at the switch
File:Alps low-profile black 2.jpg                       | Closeup
File:Alps low-profile PCB layout.jpg                    | PCB layout, with four pins per switch
</gallery>

===SKFS White===
SKFS White uses an innovative design wherein a click leaf is placed in front of a chamber whose front wall is open. The stationary sides of the leaf fit into a grooves at the side of the switch, and the movable centre section backs onto the open chamber. As such, when the click leaf is released, it has nothing to strike, and produces no click sound. The result is greater tactility than if a typical tactile leaf were used, but at a cost of requiring some empty space within the switch.

====NOS parts====
NOS switch from AliExpress.

<gallery widths=250 heights=187>
File:Alps SKFSAA -- opened.jpg                          | Opened
File:Alps SKFSAA -- tactile leaf in-place.jpg           | Tactile leaf in place
File:Alps SKFSAA -- tactile leaf from behind 1.jpg      | Tactile leaf from behind, showing that it backs against an open chamber and cannot make a click sound
File:Alps SKFSAA -- tactile leaf from behind 2.jpg      | Alternate shot of the leaf from behind under different illumination
File:Alps SKFSAA -- disassembled, back views.jpg        | Fully disassembled
</gallery>

====Apple Adjustable Keyboard====
<gallery widths=250 heights=187>
File:Alps low profile -- white -- top.jpg               | Top
File:Alps low profile -- white -- opened, top.jpg       | Opened, showing the contact mechanism, tactile leaf and [[jumper]]
File:Alps low profile -- white -- contact mechanism.jpg | Contact mechanism
File:Alps low profile -- white -- parts.jpg             | Parts
File:Alps low profile -- white -- tactile leaf.jpg      | Tactile leaf
File:Alps low profile -- white -- slider.jpg            | Slider
</gallery>

===SKFS Yellow===
SKFS Yellow is a reduced-depth switch. In a 1996 example, the Alps GlidePoint Keypad took advantage of this characteristic to provide a key with an integrated LED, which suggests that possibly by 1996 the LED versions of SKFS Black, listed in the 1994 Alps catalogue, were no longer sold.

<gallery widths=250 heights=187>
File:Alps SKFRAD.jpg           | Top
File:Alps SKFRAD -- rear.jpg   | Rear, showing external jumper
File:Alps SKFRAD -- bottom.jpg | Bottom
File:Alps SKFRAD -- opened.jpg | Opened
</gallery>