Editing Atari 800 (section)

==Gallery==
===Atari 800 Mitsumi keyboard===
This keyboard, tentatively [[Mitsumi KSD Type]], is unusual in having two [[contact mechanism#Membrane|membrane]] sheets over a PCB, instead of the usual one or three. Additionally, the sliders are cruciform mount instead of the standard negative square Mitsumi mount. The PCB and outer membrane sheet are both marked with model KSD-A58AU.

The four keys on the right of the keyboard use switches attached to the power board. In the example below, these appear to be [[Stackpole discrete switch]]es: the position of the locating peg and the terminals is correct. These four keys can also use a presently unrecognised switch type, found in a keyboard with a Stackpole keyboard assembly.<ref>Imgur — [http://imgur.com/gallery/rJyB3 Atari 800 Teardown]</ref>

The keyboard module is dated December 1982.

<gallery widths=250 heights=187>
File:Atari 800 -- Mitsumi keyboard.jpg|Atari 800 Rev A PAL with Mitsumi keyboard
File:Atari 800 -- Mitsumi keyboard, removed.jpg|Mitsumi keyboard
File:Atari 800 -- Mitsumi keyboard, bottom.jpg|Rear view showing underside of PCB
File:Atari 800 -- Mitsumi keyboard, PCB and membranes.jpg|PCB with two membrane layers
File:Atari 800 -- Mitsumi keyboard, bottom, PCB removed.jpg|PCB removed, revealing the sliders
File:Atari 800 -- Mitsumi keyboard, slider plate.jpg|Slider plate
File:Mitsumi hybrid switch, linear -- components.jpg|Switch components; note the external [[return spring]]s and cruciform sliders
File:Atari 800 -- base assembly.jpg       | Base assembly; note the switches at the front right
File:Atari 800 -- power board, top.jpg    | Power board, top
File:Atari 800 -- power board, bottom.jpg | Power board, bottom; note the terminal positions of the four switches
</gallery>