Communication multiplexer having dual microprocessors
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United States of America Patent
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Dec 11, 1984
Issued Date -
N/A
app pub date -
Jul 11, 1983
filing date -
Sep 29, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A 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.
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