Editing Tatung 71739

{{infobox dkeyboard
| image name   = Tatung 71739 front.JPG
| manufacturer = Tatung
| switch       = [[Alps SKCC Cream]]
| layouts      = 93-key standard typewriter format
| weight       = 1525 g
| years        = 1984
| keycaps      = [[Double-shot moulding]]
}}

The Tatung 71739 keyboard was part of the Tatung TPC-2000 computer released in 1984 which was Tatung's small business oriented follow up to their home computer system Einstein.

The TPC-2000 detachable keyboard has been designed with ease of use in mind. It has 93 sculptured keys arranged in standard typewriter format, and includes alpha lock, 18-key numeric pad with decimal and 6 programmable function keys which can be used to implement automatically complicated and repetitive operation with a single key stroke. The keyboard layout is documented in page 49 of the manual (see [[#Documentation|documentation]] below).

The construction of the feet and the mechanism is unusual and quite poor compared to the rest of the keyboard. The feet are rotated outwards by pressing and rotating the round "buttons" on either side of the keyboard. The beige function key and the grey alpha double-shots have a structured surface to them across the keyboard. 

===Serial Keyboard Encoder (SKE)===

The MM57499 keyboard encoder, an NMOS silicon gate technology device, is designed to be a minimum 1C solution for the purpose of interfacing detached keyboards to terminals. It can reduce the usual 18 to 24-wire keyboard to terminal interconnection to a 5-wire connection. The 96-key operation is a simple direct interface to 12 X 8 matrix keyboard. The additional capability of a 114-key option can be obtained by implementing an inexpensive 4 to 12-line decoder 1C between the MM57499 and a 12 X 12 matrix keyboard. If fewer than 96 or 144 keys are used, no connection is required in the matrix at the unused key locations.

The Tatung 71739 keyboard uses short plate mounted cream Alps SKCC switches, not General Instrument Series S950 like in the Tatung Einstein TC01. The keyboard features a buzzer which is also marked as such on the PCB.

==Gallery==
<gallery widths=250px heights=187px>
File:Tatung 71739 keycap surface.JPG          | [[Double-shot moulding|Double shot]] keycaps
File:Tatung 71739 profile.JPG                 | Keycap profile
File:Tatung 71739 plate.JPG                   | Plate mounted short cream [[Alps SKCC series]] switches
File:Tatung 71739 PCB detail.JPG              | Serial number 40700146, buzzer
File:Tatung 71739 PCB.JPG                     | PCB
File:Tatung 71739 case back stickers.JPG      | QC and serial sticker on the back case
File:Tatung 71739 production stickers.JPG     | Internal production stickers
File:Tatung 71739 feet.JPG                    | Flip feet
File:Tatung 71739 feet detail.JPG             | Flip feet mechanism
File:Tatung 71739 doubleshots.JPG             | Double-shot keycaps
File:Tatung 71739 doubleshots back.JPG        | Rear of keycaps
</gallery>

==Documentation==
* [[:File:Tatung TPC-2000 Instruction Manual.pdf|Tatung TPC-2000 instruction manual]]

==External links==
* old-computers.com &mdash; [http://www.old-computers.com/museum/computer.asp?c=903&st=1 Tatung PC-2000]
* OLDCOMPUTERS.DYNDNS.ORG &mdash; [http://oldcomputers.dyndns.org/public/pub/rechner/tatung/pics/tatung.htm Tatung information] (German)

[[Category:Tatung keyboards]]
[[Category:Keyboards with Alps SKCC switches]]
[[Category:Vintage keyboards]]
[[Category:Computers]]
[[Category:List of all keyboards]]