W83C42

www.DataSheet4U.com W83C42 KEYBOARD CONTROLLER GENERAL DESCRIPTION The W83C42 keyboard controller is programmed to support the IBM® compatible personal computer keyboard serial interface. The keyboard controller receives serial data from the keyboard, checks the parity of the data, translates the scan code, and presents the data to the system as a byte of data in its output buffer. The controller will interrupt the system when data is placed in its output buffer. The byte of data will be sent to the keyboard serially with an odd parity bit automatically inserted. The keyboard is required to acknowledge all data transmissions. No transmission should be sent to the keyboard until acknowledge is received for the previous byte sent. Winbond Electronics Corporation has developed a fast keyboard controller and BIOS to improve the performance of IBM PC/AT® 386™DX/SX and 486™DX/SX machines and their compatibles. Hardwire methodology is used in this keyboard controller instead of software implementation, as in the traditional 8042 keyboard BIOS. This enables the keyboard controller to respond instantly to all commands sent from the keyboard to the CPU BIOS. The keyboard controller enables popular programs such as AutoCAD®, Microsoft® Windows™ 3.1, NOVELL®, and other programs to run much faster. DataShee FEATURES DataSheet4U.com Supports IBM PC/AT 386DX/SX and 486 DX/SX system designs Runs much faster than traditional keyboard controllers Host interface compatible wi...