// value: value sample
// flag: flag sample

  function Value2Text(flag, value){
  switch(flag){
    case 1:                                   // ATN low (control commands)
      switch(value){
        case 0x01: return "GTL"
        case 0x04: return "SDC"
        case 0x05: return "PPC"
        case 0x08: return "GET"
        case 0x09: return "TCT"
        case 0x11: return "LLO"
        case 0x14: return "DCL"
        case 0x15: return "PPU"
        case 0x18: return "SPE"
        case 0x19: return "SPD"
        case 0x3F: return "UNL"
        case 0x5F: return "UNT"
        default:
          if (value >= 0x20 && value < 0x3F){
            return "LAD " + (value - 0x20)}
          else if (value >= 0x40 && value < 0x5F){
            return "TAD " + (value - 0x40)}
        }
    case 2:                                 // ATN high (device commands)
      if (value >= 0x20 && value <= 0x7E){
        return String.fromCharCode(32,value)}
      else if (value < 0x10){
        return "$0"+value.toString(16)}      
      else{
        return "$"+value.toString(16)}
    }
}
Value2Text(1,1)