Editing Goldtouch GTC-0033 (section)

==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>