diff --git a/ai.asm b/ai.asm
index 75a15ed..3389f0c 100644
--- a/ai.asm
+++ b/ai.asm
@@ -1,3 +1,5 @@
+.IF *>0 ;this is a trick that prevents compiling this file alone
+
 ;    @com.wudsn.ide.asm.mainsourcefile=scorch.asm
 
 ; artificial intelligence of tanks goes here!
@@ -1071,4 +1073,6 @@ YisLower
     lda LowResDistances,x
     sbc LowResDistances,y
     rts
-.endp
\ No newline at end of file
+.endp
+
+.ENDIF
\ No newline at end of file
diff --git a/constants.asm b/constants.asm
index 3436985..bbeca1e 100644
--- a/constants.asm
+++ b/constants.asm
@@ -645,9 +645,11 @@ CreditsStart
     dta   d"brad-colbert, archon800, nowy80,"^
     dta   d"Shaggy the Atarian, RetroBorsuk, ZPH"
     .IF TARGET = 800
-      dta d" "*
       .IF CART_VERSION = 0
+      dta   d","*
       dta   d"Krzysztof 'Kaz' Ziembik"^
+      .ELSE
+      dta d" "*
       .ENDIF
     .ELIF TARGET = 5200
       dta d","*
diff --git a/scorch.xex b/scorch.xex
index 14a9aac..3c4d6a0 100644
Binary files a/scorch.xex and b/scorch.xex differ