All the splash text is swapped.

constants.asm

@@ -644,9 +644,13 @@ CreditsStart
 	dta d"         "*
 CreditsEnd
 .IF target = 5200
-  CreditsLines=37
+  CreditsLines=38
 .ELSE
   CreditsLines=42  ; 34 in reality. add 7?
 .ENDIF
-
+.IF target = 5200
+  ; Atari 5200 splash
+  NewSplashText=*
+	dta d"copyright 2023 atari"
+.ENDIF
 .endif

scorch.asm

@@ -274,14 +274,12 @@ rom2joy
     ; modify the text
     splash_text = $3c80 ; '.scorch.supersystem.copyright.19xx.atari'
     splash_year = splash_text + $1e
-    lda #"2"
-    sta splash_year
-    sta splash_year+2
-    lda #"0"
-    sta splash_year+1
-    lda #"3"
-    sta splash_year+3
-    
+	splash_copyright = splash_text + $14
+	ldy #19	; 20 characters
+@	lda NewSplashText,y
+	sta splash_copyright,y
+	dey
+	bpl @-    
     
     ; splash screen delay. maybe add fire to speed up?
 @    cpx RTCLOK+1