diff --git a/Source/HBIOS/Makefile b/Source/HBIOS/Makefile
index e457bb7a..8f60c7e3 100644
--- a/Source/HBIOS/Makefile
+++ b/Source/HBIOS/Makefile
@@ -7,8 +7,8 @@ OBJECTS += MK4_std.rom
 OBJECTS += N8_std.rom
 OBJECTS += RCZ180_ext.rom
 OBJECTS += RCZ180_nat.rom
-OBJECTS += RCZ80_kio.rom
-OBJECTS += RCZ80_mt.rom
+#OBJECTS += RCZ80_kio.rom
+#OBJECTS += RCZ80_mt.rom
 #OBJECTS += RCZ80_std.rom
 #OBJECTS += RCZ80_wiz.rom
 #OBJECTS += SBC_simh.rom