#include <iostream>

 #include <iomanip>

 /**

  * Translates text from standard input to a hex-formatted System Exclusive (SysEx) message for Roland MT-32,

  * which instructs the unit to show given text on the display.

  * 

  * Roland MT-32 is capable to display 20 characters.

  * Longer messages are silently truncated by the MT-32 unit (this software does not check the length).

  * 

  * The SysEx message contains a checksum.

  * If the checksum is wrong, the MT-32 unit shows the "Exc. Checksum error" message for few seconds

  * and then returns back to the default screen.

  * 

  * Usage:

  *     amidi --port="hw:2,0,0" --send-hex="$(echo -n '   Run GNU/Linux    ' | ./mt-32-display )"

  * 

  * @param argc

  * @param argv

  * @return 

  */

 int main(int argc, char**argv) {

 	std::cout << "f0 41 10 16 12 20 00 00 ";

 	std::cout << std::hex << std::setfill('0');

 	int sum = 0;

 	// 20 00 00 = display message

 	sum += 0x20;

 	sum += 0x00;

 	sum += 0x00;

 	for (char ch; std::cin.read(&ch, 1).good();) {

 		std::cout << std::setw(2) << ((int) ch) << " ";

 		sum += ch;

 	}

 	sum %= 128;

 	sum = 128 - sum;

 	std::cout << std::setw(2) << sum;

 	std::cout << " f7";

 	std::cout << std::endl;

 	return 0;

 }