Electronic connection between microprocessor systems, and microcomputer subsystems which operate in the minimum mode and microprocessors which operate in the maximum mode

摘要

The connection (3) makes it possible that microprocessors (7) of the 8088 and 8086 type, which are connected in the "maximum mode", can now also be used in microprocessor systems (10) which are connected in the "minimum mode" so that the numeric processor (8) of the 8087 type can also be used in such systems. The carrier (9) is mounted with its terminals (2) in the socket (1) or the holder of the system. The microprocessor (7), which is connected in the "maximum mode" can communicate with the system interface (1) of the microprocessor system through the connection (3). Due to the fact that the microprocessor (7) itself operates in the "maximum mode" but the connection (3) emulates the "minimum mode", the numeric processor (8) can be integrated in the overall system (10). The connection (3) consists of two essential parts, namely the stop request logic (4) and the logic for the status signals (5). The logic is very fast so that no wait cycles are necessary at all. As a result, the basic speed of the system is preserved if the numeric processor (8) is not used. The stop request logic (4) consists of a circuit which is constructed of flip flops (11), gates (12) and resistors (13). The stop request logic generates the request (RQ) signal from the signals HOLD and CLK which come from the microprocessor system (10). From the ... Original abstract incomplete. <IMAGE>