DATA ENTRY SYSTEM

摘要

A data transfer system in which a data entry system is converted from manual operation to automatic reading in a computer system, thereby to save time in the inputting of data into the computer system. The data entry system includes a main processor having a central processing unit (CPU) and a keyboard unit including a microprocessor. Provision of the microprocessor at the keyboard enables physical separation of the keyboard unit from the CPU by means of only a single bi-directional cable. The CPU periodically sends polling data in serial data format via the bi-directional cable to the keyboard microprocessor, which then controls a keyboard matrix scanning operation in performing the commands represented by the polling data. The microprocessor then controls serial transmission of keyboard data to the CPU via the bi-directional cable. Thus the data transfer system is suitable for high performance data transfer between the CPU of the main processor and the microprocessor of the keyboard unit.