• Cadenti
  logic family
  medium scale integration
  metal oxide semiconductor
  ac register
  accumulator logic
  adder circuit
  basic computer design
  branch unconditionally
  flowchart
  input and output communication
  input output instruction
  input register
  interrupt cycle
  logic adder circuits
  logic gates
  output register
  register and memory
  binary code
  binary number
  clock pulse
  data types
  decimal numbers
  

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ASCII

code is the ASCII (American Standard Code for Information Interchange), which uses seven bits to code 128 characters. The binary code for the uppercase letters, the decimal digits, and a few special characters is listed in Table 3-4. Note that the decimal digits in ASCII can be converted to BCD by removing the three high-order bits, 011.

Binary codes play an important part in digital computer operations. The codes must be in binary because registers can only hold binary information. One must realize that binary codes merely change the symbols, not the meaning of the discrete elements they represent. The operations specified for digital computers must take into consideration the meaning of the bits stored in registers so that operations are performed on operands of the same type. In inspecting the bits of a computer register at random, one is likely to find that it represents some type of coded information rather than a binary number.

Binary codes can be formulated for any set of discrete elements such as the musical notes and chess pieces and their positions on the chessboard. Binary codes are also used to formulate instructions that specify control information for the computer.

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