Communication multiplexer module
Apparatus and method for switching of data
Modular block unit for input-output subsystem
Communication control unit
Control system providing for the transfer of data in a communications processing system employing channel dedicated control blocks
Adapter cluster module for data communications subsystem
Disk address controller
Multiple CPU control system Patent #: 4231086
ApplicationNo. 06/512701 filed on 07/11/1983
US Classes:710/48Input/Output interrupting
ExaminersPrimary: Thomas, James D.
Assistant: Eng, David Y.
Attorney, Agent or Firm
International ClassesG06F 13/24 (20060101)
G06F 15/16 (20060101)
G06F 13/20 (20060101)
G06F 15/167 (20060101)
AbstractA data processing system includes a communication subsystem having an I/O microprocessor for communicating with a central processing unit and a main memory; and a line microprocessor for communicating with a number of devices. The I/O microprocessor and the line microprocessor communicate with each other through mailboxes stored in a shared memory. The line microprocessor interrupts the I/O microprocessor to process data bytes being transferred between main memory and a device requesting service when the line microprocessor has responded to the requesting device and loaded the mailbox.