Related Products Keyboard Simulator Card
Original Publication Date: 1985-Feb-01
Included in the Prior Art Database: 2005-Feb-18
A technique is described whereby an asynchronous communications circuit card is used to provide bidirectional communications between a Personal Computer (PC) and designated testing facilities. The technique is particularly useful in a high volume system test environment where diagnostics are run automatically on the system under test without an attached terminal or keyboard. The extended keyboard simulator circuit card consists of four major sections, as shown in the drawing: command register 10, Usart (8251) 11, programmable timer/counter (8253) 12 and status register 13. The command register 10 controls four modes of operation: transmit or receive to either standard PC or PC XT/3270 keyboard interfaces. The command register 10 controls the protocol differences between the four modes of operation.