Graphic printer

  • US 4,972,341 A
  • Filed: 05/20/1988
  • Issued: 11/20/1990
  • Est. Priority Date: 05/21/1987
  • Status: Expired due to Term
First Claim
Patent Images

1. A computer peripheral device controlled by a command signal from an external computer comprising:

  • (a) switching means for setting a predetermined code;

    (b) comparing means for comparing the predetermined code set by the switching means and a command for driving the peripheral device generated from the computer;

    (c) control means for controlling the operation of the computer peripheral device indicated by the command on the basis of an output signal from the comparing means; and

    (d) wherein the control means controls the operation indicated by the command only when the command coincides with the code.

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