Data Loss Prevention Via Overwrite Protection
Original Publication Date: 1988-Jun-01
Included in the Prior Art Database: 2005-Feb-15
This article describes a technique for use in a personal computer (PC) system which prevents spurious device data loss with both a keyboard and a mouse operational in asynchronous manner. (Image Omitted) In some PC systems, the keyboard and mouse are controlled by a single peripheral chip. This chip is a universal peripheral interface (UPI) which acts as a micro-computer. The UPI accepts commands as well as performing the serial interface protocol to the keyboard and the mouse. The UPI has only one data buffer so it must be used in a serial fashion. When the host is using the keyboard and the mouse as input devices only, the UPI controls the inflow of data. The UPI will prevent either device from presenting data until pending data is read by the host.