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Apparatus for programming a PROM by propagating data words from an address bus to the PROM data terminals

  • US 4,244,032 A
  • Filed: 12/16/1977
  • Issued: 01/06/1981
  • Est. Priority Date: 12/16/1977
  • Status: Expired due to Term
First Claim
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1. An adapter for use in connection with an instruction-controlled processor to form an apparatus for carrying out a programming operation to program a PROM having a plurality of locations and a plurality of terminals defining a set of address terminals and a set of data terminals, at least one of the terminals being a program control terminal, the processor having processor socket means for having a pre-programmed PROM inserted therein for use in normal operation of the processor, an internal address bus connected to the processor socket means, and reading means for use in such normal operation to read out such a pre-programmed PROM, the reading means including means for causing the internal address bus to carry a multibit signal, the encoding of which in normal operation of the processor is such as to define an address each time the processor executes a predetermined instruction, the reading means further including means for supplying timing signals used in selecting such pre-programmed PROM, the adapter comprising:

  • an adapter input for connecting the adapter to the processor, the adapter input including adapter plug means for temporary insertion into the processor socket means so that the multibit signal is received by the adapter from the internal address bus;

    adapter socket means into which a PROM to be programmed is inserted for the programming operation; and

    control circuit means for entering a plurality of data words into such inserted PROM, the control circuit means including addressing means connected to the adapter socket means for applying a sequence of addresses to the set of address terminals of such inserted PROM so that each such data word is entered into a separate location, signal propagating means connected between the adapter plug means and the adapter socket means for propagating to the set of data terminals of such inserted PROM each multibit signal of a sequence of such multibit signals received from the internal address bus, and pulse generating means connected by the adapter input to receive the timing signals so as to respond to the timing signals to apply a control signal to the program control terminal of such inserted PROM to cause entry into such inserted PROM each multibit signal that is propagated from the internal address bus to the set of data terminals.

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