diff --git a/Source/FZ80/Makefile b/Source/FZ80/Makefile
index adc2ef43..eadbbb79 100644
--- a/Source/FZ80/Makefile
+++ b/Source/FZ80/Makefile
@@ -4,7 +4,11 @@ FZ80ROM = ../../Binary/FZ80_std.rom
 HD1KIMGS = ../../Binary/hd1k_cpm22.img ../../Binary/hd1k_zsdos.img ../../Binary/hd1k_nzcom.img \
 	../../Binary/hd1k_cpm3.img ../../Binary/hd1k_zpm3.img ../../Binary/hd1k_ws4.img
 
-OBJECTS := $(HD1KFZ80PREFIX) $(HD1KFZ80COMBOIMG)
+OBJECTS :=
+
+ifneq ($(wildcard $(FZ80ROM)),)
+	OBJECTS += $(HD1KFZ80PREFIX) $(HD1KFZ80COMBOIMG)
+endif
 
 DEST=../../Binary
 
diff --git a/Source/ver.inc b/Source/ver.inc
index 75bfdceb..f506baab 100644
--- a/Source/ver.inc
+++ b/Source/ver.inc
@@ -2,7 +2,7 @@
 #DEFINE	RMN	5
 #DEFINE	RUP	0
 #DEFINE	RTP	0
-#DEFINE BIOSVER	"3.5.0-dev.68"
+#DEFINE BIOSVER	"3.5.0-dev.69"
 #define rmj	RMJ
 #define rmn	RMN
 #define rup	RUP
diff --git a/Source/ver.lib b/Source/ver.lib
index 6dc8c491..bfcdfc06 100644
--- a/Source/ver.lib
+++ b/Source/ver.lib
@@ -3,5 +3,5 @@ rmn	equ	5
 rup	equ	0
 rtp	equ	0
 biosver	macro
-	db	"3.5.0-dev.68"
+	db	"3.5.0-dev.69"
 	endm
diff --git a/Tools/simh/altairz80.exe b/Tools/simh/altairz80.exe
index 5e34f627..8222fb91 100644
Binary files a/Tools/simh/altairz80.exe and b/Tools/simh/altairz80.exe differ
diff --git a/Tools/simh/altairz80_doc.pdf b/Tools/simh/altairz80_doc.pdf
new file mode 100644
index 00000000..00edf44f
Binary files /dev/null and b/Tools/simh/altairz80_doc.pdf differ
diff --git a/Tools/simh/simh.pdf b/Tools/simh/simh.pdf
new file mode 100644
index 00000000..fc903686
Binary files /dev/null and b/Tools/simh/simh.pdf differ
diff --git a/Tools/simh/simh_doc.pdf b/Tools/simh/simh_doc.pdf
new file mode 100644
index 00000000..efca7269
Binary files /dev/null and b/Tools/simh/simh_doc.pdf differ
diff --git a/Tools/simh/simh_faq.pdf b/Tools/simh/simh_faq.pdf
new file mode 100644
index 00000000..45c23060
Binary files /dev/null and b/Tools/simh/simh_faq.pdf differ