Dual Use of Logic for Normal Operation and Off Line Diagnostic Testing
Original Publication Date: 1978-Apr-01
Included in the Prior Art Database: 2005-Feb-20
Most of the logic in the illustrated keyboard/CRT display apparatus can be tested off line by using existing hardware and data paths for both normal (on-line) operation, and off-line diagnostic testing. This is accomplished with the addition of a minimal amount of control logic and an on-line/off-line switch.