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Define HRQ?

  Shared By: Jack Evans    Date: Apr 22    Category: Assembly Language    Views: 1249


The hold request output requests the access of the system bus. In non- cascaded 8257 systems, this is connected with HOLD pin of CPU. In cascade mode, this pin of a slave is connected with a DRQ input line of the master 8257, while that of the master is connected with HOLD input of the CPU.


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