Patents by Inventor Richard W. MacMillan

Richard W. MacMillan has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Switching arrangement for the input of interrupt commands and the output of interrupt acknowledgment for computer systems
    Patent number: 4271464
    Abstract: In order to provide an interrupt command signal in a computer and receive an interrupt acknowledgment at a single input/output terminal, an interrupt command encoder includes an inverter for receiving an interrupt command at a first logic level and providing the interrupt command at a second logic level to the single input/output terminal. An interrupt command logic circuit responds to the interrupt command to produce an interrupt signal to the computer which, in turn, is fed back to the single input/output terminal as an interrupt acknowledgment signal of the first logic level. A gate connected to the interrupt command input and to the single input/output terminal is responsive to the interrupt acknowledgment signal of the first logic level only to provide a corresponding signal acknowledging that the computer has received the interrupt signal.
    Type: Grant
    Filed: September 29, 1978
    Date of Patent: June 2, 1981
    Assignee: Siemens Aktiengesellschaft
    Inventor: Richard W. MacMillan