/*
  Arduino EBCDIC Demonstration

  Converts a limited set of ASCII characters
  (A-Z, 0-9, and space) to EBCDIC code points.
*/

byte asciiToEBCDIC(char c)
{
  // Space
  if (c == ' ')
    return 0x40;

  // Digits 0-9
  if (c >= '0' && c <= '9')
    return 0xF0 + (c - '0');

  // Uppercase letters A-I
  if (c >= 'A' && c <= 'I')
    return 0xC1 + (c - 'A');

  // Uppercase letters J-R
  if (c >= 'J' && c <= 'R')
    return 0xD1 + (c - 'J');

  // Uppercase letters S-Z
  if (c >= 'S' && c <= 'Z')
    return 0xE2 + (c - 'S');

  return 0x00; // unsupported character
}

void setup()
{
  Serial.begin(9600);

  String text = "HELLO 123";

  Serial.println("ASCII -> EBCDIC");

  for (int i = 0; i < text.length(); i++)
  {
    char c = text[i];
    byte ebcdic = asciiToEBCDIC(c);

    Serial.print(c);
    Serial.print(" -> 0x");

    if (ebcdic < 16)
      Serial.print('0');

    Serial.println(ebcdic, HEX);
  }
}

void loop()
{
  // Nothing to do
}