|This article requires additional photographic illustration|
|Part number||GTC-0033 (white) / GTC-0077 (black)|
|Features||Integrated 2-port USB hub|
|Layouts||Numpad with double zero + 4 control keys (22 keys)|
|Keyswitches||Cherry MX Brown|
|Switch mount||Plate mount|
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, 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 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.
With Num Lock Active
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. 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.