   #include "tetris.h"
 };
 
-struct { byte *gt1; char *name; } gt1Files[] = {
+const struct { byte *gt1; char *name; } gt1Files[] = {
   { TinyBASIC_gt1, "Tiny BASIC"               }, // 2702 bytes
   { WozMon_gt1,    "WozMon"                   }, // 595 bytes
 #if maxStorage >= 10000

 */
void loop()
{
  // Controller pass through
  #if gameControllerDataPin >= 0
    digitalWrite(gigatronDataPin, digitalRead(gameControllerDataPin));
  #endif

  // Commands from upstream USB (PC/laptop)
  #if hasSerial

  // Open upstream communication
  #if hasSerial
    Serial.begin(115200);
    doVersion();
  #endif

  // In case we power on together with the Gigatron, this is a
  // good pause to wait for the video loop to have started
