 
 void doVersion()
 {
-  Serial.println(":Gigatron Interface Adapter [Arduino]");
+  Serial.println(":Gigatron Interface Adapter [Arduino]\n"
+                 ":Type 'H' for help");
 }
 
 void doHelp()
 {
   Serial.println(":Commands are");
-  Serial.println(":V   Show version");
-//Serial.println(":E0  Echo off");
-//Serial.println(":E1  Echo on");
-  Serial.println(":R   Reset Gigatron");
-  Serial.println(":L   Start Loader");
-  Serial.println(":P   Transfer object file from PROGMEM");
-  Serial.println(":U   Transfer object file from USB");
-  Serial.println(":H   Show this help");
+  Serial.println(": V        Show version");
+  Serial.println(": H        Show this help");
+  Serial.println(": R        Reset Gigatron");
+  Serial.println(": L        Start Loader");
+  Serial.println(": P        Transfer object file from PROGMEM");
+  Serial.println(": U        Transfer object file from USB");
+  Serial.println(": W/A/S/D  Up/left/down/right arrow");
+  Serial.println(": Z/X      A/B button ");
+  Serial.println(": Q/E      Select/start button");
 }
 
 void doReset()

void doCommand(char line[])
{
  switch (toupper(line[0])) {
  case 'V': doVersion();         break;
  case 'R': doReset();           break;
  case 'L': doLoader();          break;
  case 'P': doTransfer(gt1File); break;
  case 'U': doTransfer(NULL);    break;
  case 'H': doHelp();            break;
  case 0:                        break;
  default:  Serial.println("!Unknown command (type 'H' for help)");
  }
  prompt();

// serial interface without adding upstream complexity. But as the
// Arduino's 2K of RAM can't buffer an entire file at once, some
// intelligence is needed there and we haven't found a good way yet.
// The Arduino doesn't implement any form of flow control on its
// USB/serial interface (RTS/CTS or XON/XOFF).

// This interface program can also receive data over the USB serial interface.
// Use the sendGt1.py Python program on the computer to send a file.
// The file must be in GT1 format (.gt1 extension)
// For example:
//   python sendGt1.py life3.gt1

// XXX Add commands for sending game controller signals
// XXX Better check if Gigatron is running OK (judge signals better)
// XXX Try higher than 9600 transfer rates again
// XXX Wild idea: let the ROM communicate back by modulating vPulse
// XXX Hardware: Put reset line on the DB9 jack
// XXX Hardware: Put an output line on the DB9 jack
// XXX Embed a Gigatron Terminal program. Or better: GigaMon

const byte gt1File[] PROGMEM = {
  //#include "Blinky.h" // Blink pixel in middle of screen
