diff --git a/Source/HBIOS/cvdu.asm b/Source/HBIOS/cvdu.asm
index 4b51dfa2..1ceb847d 100644
--- a/Source/HBIOS/cvdu.asm
+++ b/Source/HBIOS/cvdu.asm
@@ -96,7 +96,7 @@ CVDU_FNTBL:
 	.DW	KBD_READ
 #IF (($ - CVDU_FNTBL) != (VDA_FNCNT * 2))
 	.ECHO	"*** INVALID CVDU FUNCTION TABLE ***\n"
-	FAIL
+	!!!!!
 #ENDIF
 
 CVDU_VDAINI:
diff --git a/Source/HBIOS/sn76489.asm b/Source/HBIOS/sn76489.asm
index 18f7f649..3c12acb6 100644
--- a/Source/HBIOS/sn76489.asm
+++ b/Source/HBIOS/sn76489.asm
@@ -304,7 +304,7 @@ SN7_FNTBL:
 
 #IF (($ - SN7_FNTBL) != (SND_FNCNT * 2))
 	.ECHO	"*** INVALID SND FUNCTION TABLE ***\n"
-	FAIL
+	!!!!!
 #ENDIF
 
 PENDING_PITCH
diff --git a/Source/HBIOS/tms.asm b/Source/HBIOS/tms.asm
index 14c50b3d..b802d569 100644
--- a/Source/HBIOS/tms.asm
+++ b/Source/HBIOS/tms.asm
@@ -189,7 +189,7 @@ TMS_FNTBL:
 #ENDIF
 #IF (($ - TMS_FNTBL) != (VDA_FNCNT * 2))
 	.ECHO	"*** INVALID TMS FUNCTION TABLE ***\n"
-	FAIL
+	!!!!!
 #ENDIF
 
 TMS_VDAINI:
diff --git a/Source/HBIOS/vdu.asm b/Source/HBIOS/vdu.asm
index 1c2a2ca1..2c057ca2 100644
--- a/Source/HBIOS/vdu.asm
+++ b/Source/HBIOS/vdu.asm
@@ -150,7 +150,7 @@ VDU_FNTBL:
 	.DW	PPK_READ
 #IF (($ - VDU_FNTBL) != (VDA_FNCNT * 2))
 	.ECHO	"*** INVALID VDU FUNCTION TABLE ***\n"
-	FAIL
+	!!!!!
 #ENDIF
 
 VDU_VDAINI:
diff --git a/Source/HBIOS/vga.asm b/Source/HBIOS/vga.asm
index dde15dae..30bb2b4e 100644
--- a/Source/HBIOS/vga.asm
+++ b/Source/HBIOS/vga.asm
@@ -163,7 +163,7 @@ VGA_FNTBL:
 	.DW	KBD_READ
 #IF (($ - VGA_FNTBL) != (VDA_FNCNT * 2))
 	.ECHO	"*** INVALID VGA FUNCTION TABLE ***\n"
-	FAIL
+	!!!!!
 #ENDIF
 
 VGA_VDAINI: