diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index c6dfbb0a..2eadb3ce 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -17,6 +17,7 @@ jobs:
     - name: Build
       run: |
         make
+        make clean
         rm -rf .git
     - name: Upload Archive
       uses: actions/upload-artifact@v1
diff --git a/Source/HBIOS/Makefile b/Source/HBIOS/Makefile
index fa07785f..8f60c7e3 100644
--- a/Source/HBIOS/Makefile
+++ b/Source/HBIOS/Makefile
@@ -1,43 +1,45 @@
 OBJECTS =
 
-ifeq (1,0)
-OBJECTS += DYNO_std.rom 
-OBJECTS += EZZ80_std.rom 
-OBJECTS += MK4_std.rom 
+ifeq (1,1)
+OBJECTS += DYNO_std.rom
+OBJECTS += EZZ80_std.rom
+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_std.rom 
-OBJECTS += RCZ80_wiz.rom 
-OBJECTS += SBC_simh.rom
-OBJECTS += SBC_std.rom 
-OBJECTS += SCZ180_126.rom 
-OBJECTS += SCZ180_130.rom 
-OBJECTS += UNA_std.rom
+OBJECTS += RCZ180_ext.rom
+OBJECTS += RCZ180_nat.rom
+#OBJECTS += RCZ80_kio.rom
+#OBJECTS += RCZ80_mt.rom
+#OBJECTS += RCZ80_std.rom
+#OBJECTS += RCZ80_wiz.rom
+#OBJECTS += SBC_simh.rom
+#OBJECTS += SBC_std.rom 
+#OBJECTS += SCZ180_126.rom
+#OBJECTS += SCZ180_130.rom
+#OBJECTS += UNA_std.rom
+#OBJECTS += ZETA_std.rom
+#OBJECTS += ZETA2_std.rom
+else
 OBJECTS += ZETA_std.rom
+OBJECTS += ZETA2_std.rom
 endif
 
-OBJECTS += ZETA2_std.rom 
-
 MOREDIFF = camel80.bin game.bin hbios_rom.bin nascom.bin prefix.bin usrrom.bin \
 	dbgmon.bin hbios_app.bin imgpad0.bin osimg1.bin romldr.bin \
 	eastaegg.bin hbios_img.bin imgpad.bin osimg.bin tastybasic.bin \
 	game.bin usrrom.bin
 
-SUBDIRS = 
-DEST = ../../Binary
-TOOLS =../../Tools
-OTHERS =  *.img *.rom *.com *.bin *.z80 cpm.sys zsys.sys Build.inc RomDisk.tmp font*.asm
-include $(TOOLS)/Makefile.inc
+SUBDIRS = 
+DEST = ../../Binary
+TOOLS =../../Tools
+OTHERS =  *.img *.rom *.com *.bin *.z80 cpm.sys zsys.sys Build.inc RomDisk.tmp font*.asm
+include $(TOOLS)/Makefile.inc
 
 ifeq ($(DIFFMAKE),1)
 	DIFFBUILD := -d $(DIFFTO)/Source/HBIOS
 endif
 
 DIFFPATH = $(DIFFTO)/Binary
-
+
 
 ROMSIZE=512
 
@@ -46,8 +48,8 @@ N8_std.rom: ROMSIZE=512
 %.rom:
 	bash Build.sh $(DIFFBUILD) $(shell echo $* | tr '_' ' ') $(ROMSIZE)
 
-#ZETA2_std.rom:
-#	bash Build.sh ZETA2 std 512
+#ZETA2_std.rom:
+#	bash Build.sh ZETA2 std 512
 
 hbios_rom.bin:	hbios.asm build.inc
 	$(TASM) -dROMBOOT hbios.asm hbios_rom.bin hbios_rom.lst