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Peripheral-unit controller apparatus

  • US 4,124,888 A
  • Filed: 12/24/1975
  • Issued: 11/07/1978
  • Est. Priority Date: 12/24/1975
  • Status: Expired due to Term
First Claim
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1. In a peripheral-unit controller adapted to interconnect a peripheral unit and a digital computer unit for the control of data signals being transferred therebetween, a control device comprising:

  • a plurality of read-only memory units, each such unit having a plurality of input lines and a corresponding plurality of output lines;

    each of said memory units having a set of microcode words stored therein, any word of which may be applied to said plurality of output lines of said memory units in accordance with address signals applied to said plurality of input lines of said units, the sets of microcode words stored in the respective memory units being different from each other;

    means for applying a set-selection signal to at least one of said plurality of input lines for selecting only one of said sets of microcode; and

    means for applying a plurality of address signals to others of said input lines for transferring a particular microcode word of said selected set of said microcode words to said plurality of output lines to control said peripheral unit.

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