diff --git a/blk/628 b/blk/628
index abd4ef2..720a699 100644
--- a/blk/628
+++ b/blk/628
@@ -6,4 +6,5 @@
     ( sprite, inverted colors ) 0x3f _data 15 _zero
     0x4000 _ctl 0x5e 0 DO ~FNT I 7 * + _sfont LOOP
     0 XYPOS !
+    ( bit 6, enable display, bit 7, ?? ) 0x81c0 _ctl
 ;
diff --git a/recipes/sms/Makefile b/recipes/sms/Makefile
index c0ace7e..4fc7a0c 100644
--- a/recipes/sms/Makefile
+++ b/recipes/sms/Makefile
@@ -7,6 +7,9 @@ all: $(TARGET)
 $(TARGET): xcomp.fs $(STAGE)
 	cat xcomp.fs | $(STAGE) > $@
 
+os.sms: $(TARGET)
+	dd if=$(TARGET) bs=32752 conv=sync | cat - sega.bin > $@
+
 $(EMUL):
 	$(MAKE) -C ${@:%/sms=%}
 
diff --git a/recipes/sms/sega.bin b/recipes/sms/sega.bin
new file mode 100644
index 0000000..9db7c7c
Binary files /dev/null and b/recipes/sms/sega.bin differ