diff --git a/hardware/playfield1.c b/hardware/playfield1.c
index da72f3d..fd0f8d8 100644
--- a/hardware/playfield1.c
+++ b/hardware/playfield1.c
@@ -27,6 +27,7 @@
  * A simple setup to display a playfield with a depth of 1 bit.
  */
 extern struct Custom custom;
+char VERSION_STRING[] = "\0$VER: playfield1 1.0 (21.09.2016)\0";
 
 static UWORD __chip coplist[] = {
     COP_MOVE(BPL1PTH, 0),
@@ -81,6 +82,11 @@ int main(int argc, char **argv)
     // and point to the copper list
     custom.cop1lc = (ULONG) coplist;
 
+    // strobe the COPJMP1 register to make sure the system is using
+    // copper list 1 (I found out that leaving this out can lead to
+    // strange effects on an emulated 4000 system)
+    custom.copjmp1 = 1;
+
     waitmouse();
 
     reset_display();
diff --git a/hardware/sprites.c b/hardware/sprites.c
index 56dce45..058f558 100644
--- a/hardware/sprites.c
+++ b/hardware/sprites.c
@@ -7,6 +7,7 @@
  * A simple setup to display a sprite.
  */
 extern struct Custom custom;
+char VERSION_STRING[] = "\0$VER: sprites 1.0 (21.09.2016)\0";
 
 static UWORD __chip coplist_pal[] = {
     COP_MOVE(SPR0PTH, 0x0000),
@@ -44,6 +45,7 @@ int main(int argc, char **argv)
     coplist_pal[3] = (((ULONG) spdat0) >> 16) & 0xffff;
 
     custom.cop1lc = is_pal ? (ULONG) coplist_pal : (ULONG) coplist_ntsc;
+    custom.copjmp1 = 1;
 
     waitmouse();
 
diff --git a/hardware/startup.c b/hardware/startup.c
index ef4ec60..83a311a 100644
--- a/hardware/startup.c
+++ b/hardware/startup.c
@@ -14,6 +14,7 @@
  * A great starting point to use as a template for demos and games.
  */
 extern struct Custom custom;
+char VERSION_STRING[] = "\0$VER: startup 1.0 (21.09.2016)\0";
 
 static UWORD __chip coplist_pal[] = {
     COP_MOVE(BPLCON0, BPLCON0_COMPOSITE_COLOR),
@@ -41,8 +42,14 @@ int main(int argc, char **argv)
     struct Task *current_task = FindTask(NULL);
     BYTE old_prio = SetTaskPri(current_task, TASK_PRIORITY);
     BOOL is_pal = init_display();
+
     custom.cop1lc = is_pal ? (ULONG) coplist_pal : (ULONG) coplist_ntsc;
 
+    // strobe the COPJMP1 register to make sure the system is using
+    // copper list 1 (I found out that leaving this out can lead to
+    // strange effects on an emulated 4000 system)
+    custom.copjmp1 = 1;
+
     waitmouse();
 
     reset_display();