Automatic Math Co-Processor Presence Detection for Personal Computers
Original Publication Date: 1987-Nov-01
Included in the Prior Art Database: 2005-Feb-02
A technique is described whereby a math co-processor may be installed in a personal computer (PC) without modifying switch settings. An individual circuit provides a detection and testing function to automatically detect the presence of a math co-processor. In prior art, whenever a math co-processor was installed in a PC, DIP switch settings required modification to enable determining the presence of the co-processor. A DIP socket is provided on the planar board for the co-processor option. The presence of the co-processor is automatically detected by latching the state of the busy signal, as shown in the figure. It is assumed that the presence of the co-processor will not be busy at the end of a system reset.