Editing Oriental Tech OK-100M

{{infobox dkeyboard
| name         = 
| image name   = OTC_OK-100M_--_front.jpg
| pn           = 
| fcc          = IZEOTCOK100M (1991)
| branding     = None
| manufacturer = [[Oriental Tech]]
| switch       = [[Oriental Tech spring-over-membrane]]
| layouts      = [[Asian 101]]
| features     = Variable weight
| interface    = [[XT/AT switchable]]
| family       = [[Oriental Tech OK-100 series]]
| weight       = 
| years        = 
| switch mount = 
| keycaps      = Cylindrical [[Alps mount]] [[double-shot]]
| introduced   = ca. 1991 (FCC registration)
}}

'''OK-100M''' is a progressive-rate spring-over-membrane keyboard in the [[Oriental Tech OK-100 series]].

==Description==
OK-100M uses double-shot [[Alps mount]] [[Tai-Hao TI series]] keycaps over sliders. The keyboard is [[XT/AT switchable]].

To cater for both US and European layouts, a separate slider module carries the sliders for the keys to the left of Z/Y: one for US layout (long left shift), and two for European layouts (smaller left shift with an additional key to its right). The underlying membrane has three contact positions accordingly.

According to the box, the OK-100 series was sold in the following layouts: Arabic, Belgian, Canadian, Chinese, Danish, Dutch, French, German, USSR, Italian, Korean, Latin America, Norwegian, Portuguese, Spanish, Swedish, Swiss, UK and US.

==Characteristics==
The keyboard characteristics vary; the following characteristics have been noted on one OK-100M keyboard, and they may not apply to all keyboards:

===Variable weighting===
Various switches use longer return springs, to give them more resistance. These include keys such as control and shift — generally, keys around the side and bottom edges. Broadly, these use blue sliders instead of white sliders, but slider colour does not appear to be completely consistent.

The OK-100M leaflet claims 60±20 cN for standard keys, and 90±25 cN for the space bar, with an initial force of 30 cN. The actual feel of the switches is significantly lighter than 60 cN, with a simple coin-stacking test suggesting around 45 cN for the normal keys. One could also presume that all the other heavy keys use the same nominal 90±25 cN switches as space bar.

===Different membrane springs===
The same keyboard can have both parallel (cylindrical) and flared membrane springs (the springs inside the sliders that press down on the membrane sheets). No reason for this is apparent.

==Gallery==
===UK layout===
<gallery widths=250px heights=187px>
File:OTC OK-100M -- front.jpg                             | Front
File:OTC OK-100M -- switches and keycaps.jpg              | Switches and keycaps
File:OTC OK-100M -- rear.jpg                              | Rear
File:OTC OK-100M -- XT-AT switch.jpg                      | XT/AT switch
File:OTC OK-100M -- label.jpg                             | Label
File:OTC OK-100M -- serial number label.jpg               | Serial number label, with key count ("102")
File:OTC OK-100M -- slider plate detail.jpg               | Slider plate detail
File:OTC OK-100M -- membranes.jpg                         | Membranes
File:OTC OK-100M -- membrane layers.jpg                   | Membrane layers
File:OTC OK-100M -- membrane legend.jpg                   | Membrane legend
File:OTC OK-100M -- inconsistent sliders.jpg              | Inconsistent sliders
File:OTC OK-100M -- different membrane springs.jpg        | Flared and parallel membrane springs
File:OTC OK-100M -- membrane springs.jpg                  | Membrane springs
File:OTC OK-100M -- return springs.jpg                    | Return springs
File:OTC OK-100M -- ISO module.jpg                        | ISO module
File:OTC OK-100M -- controller board location.jpg         | Controller board attaches to back of membrane assembly
File:OTC OK-100M -- box, front.jpg                        | Box
File:OTC OK-100M -- box, rear.jpg                         | Rear of box showing list of possible models and layouts
File:OTC OK-100M -- sticking key.jpg                      | Sticking key; for a [[NIB]] keyboard, this indicates a manufacturing defect
</gallery>

===Leaflet===
<gallery widths=187px heights=250px>
File:Oriental Tech OK-100M -- leaflet, instructions.jpg   | "Front" with XT/AT instructions and connector details
File:Oriental Tech OK-100M -- leaflet, specifications.jpg | "Rear" with specifications
</gallery>

[[Category:Oriental Tech keyboards]]
[[Category:Spring-over-membrane keyboards]]
[[Category:Protocol switchable keyboards]]
[[Category:Office keyboards]]
[[Category:List of all keyboards]]