Editing Goldtouch GTC-0033

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{{infobox dkeyboard
| name         = Goldtouch GTC-0033 (white)<br>Goldtouch GTC-0077 (black)
| image name   = Gtc0033.jpg
| pn           = GTC-0033 (white) / GTC-0077 (black)
| fcc          = 
| branding     = [[Goldtouch]]
| manufacturer =
| switch       = [[Cherry MX Brown]]
| layouts      = Numpad with double zero + 4 control keys (22 keys)
| features     = Integrated 2-port USB hub
| interface    = [[USB]]
| weight       = 
| switch mount = [[Switch mount#Plate mount|Plate mount]]
| introduced   =
| price        =
}}

The '''[[Goldtouch]] GTC-0033''' is a numeric keypad that utilizes [[Cherry MX Brown]] switches. Goldtouch also makes the GTC-0077, a similar numeric keypad in black,<ref>Deskthority — [https://deskthority.net/ebay-com-f67/goldtouch-gtc-0077-usb-numeric-keypad-hub-wired-keypad-bla-t2294.html GoldTouch GTC-0077 USB Numeric Keypad Hub Wired Keypad - Black]</ref> as well as two Macintosh variants. The Macintosh variants are distinguished by their font, which is similar to the font used by Apple on many of its keyboards.

The two 2[[Unit|u]] keys, the + and [[Enter key|Enter]], are stabilised with [[Stabiliser#PCB_mount|PCB mounted stabilisers]]. All keys use relatively thin [[ABS]] [[Keycap_printing#Pad_Printing|pad-printed]] keycaps with the same profile in all rows.

==Layout==

The layout of the numeric keypad is mostly similar to other numeric keypads, both separate and integrated with full size keyboards. There are a further four 1u keys across the top, which act as Escape, Tab, Backspace and Shift/Fn. When the Shift/Fn key is pressed, there are currency and mathematical symbols available that would not normally be found on a standard numeric keypad.

<gallery widths=167 heights=250>
Image:Goldtouch-GTC-0033-Layout-NumLock.png   | With [[Num Lock]] Active
Image:Goldtouch-GTC-0033-Layout-NoNumLock.png | With Num Lock Inactive
Image:Goldtouch-GTC-0033-Layout-ShiftFn.png   | With Shift/Fn Active
</gallery>

==Mainboard==

[[Image:Goldtouch-GTC-0077-PCB-front.jpg|thumb|200px|The PCB used in the GTC-0077]]

There is a single PCB housed in the case. A plate is mounted to the PCB to support the key switches. The USB cable to the PC is connected by a 5-pin connector to a header on the board (JP1). A USB A female socket is mounted at the top of the board on both the left (UJ1) and the right (UJ2). There is a green LED (DS Num), with a support underneath presumably to support the long legs, to signify the status of num lock.

The main controller on the board (U2) is a [[Cypress Semiconductor]] IC. The model number printed on the top reads CY7C63413C-PVXC which indicates this to be a controller that was specifically designed for low-speed high-I/O applications such as keyboards<ref>[http://www.cypress.com/file/125846/download Datasheet for Cypress CY7C63413C, CY7C63513C and CY7C63613C Low-Speed High Input/Output 1.5-Mbps USB Controller]</ref>. Unfortunately, this controller is one-time programmable and so it would not be possible to reprogram it. This IC is also a surface mount component which would make it difficult to replace with a differently programmed IC.

A second IC on the board (U1) is a USB 2.0 hub controller<ref>[http://pdf1.alldatasheet.com/datasheet-pdf/view/218979/ETC2/AU6254/+Q1J98AVwSw9bDXzNCC+/datasheet.pdf AU6254 USB2.0 Hub Controller Technical Reference Manual]</ref>. The model number on the top of the IC reads AU6254 and bears the logo of [[Alcor Micro]].

<gallery widths=250 heights=187>
Image:Goldtouch-GTC-0077-PCB-controller.jpg | Close up of the keyboard controller IC
Image:Goldtouch-GTC-0077-PCB-usb-hub.jpg    | Close up of the USB hub IC
</gallery>

==References==
<references />

[[Category:List of all keyboards]]
[[Category:Keyboards with Cherry MX switches]]
[[Category:Numeric keypads]]
[[Category:Goldtouch keyboards]]