diff --git a/Makefile b/Makefile
index 86e01f8e..73aa2338 100644
--- a/Makefile
+++ b/Makefile
@@ -51,6 +51,7 @@ KA10=tools/sims/BIN/ka10
 ITSTAR=tools/itstar/itstar
 WRITETAPE=tools/tapeutils/tapewrite
 MAGFRM=tools/dasm/magfrm
+GT40=$(OUT)/bootvt.img
 
 H3TEXT=$(shell cd build; ls h3text.*)
 SMF:=$(addprefix tools/,$(addsuffix /.gitignore,$(SUBMODULES)))
@@ -60,10 +61,13 @@ all: $(SMF) $(OUT)/stamp tools/supdup/supdup
 
 check: all check-dirs
 
-out/klh10/stamp out/simh/stamp: $(OUT)/rp0.dsk
+out/klh10/stamp: $(OUT)/rp0.dsk
 	$(TOUCH) $@
 
-out/sims/stamp: $(OUT)/rp03.2 $(OUT)/rp03.3
+out/simh/stamp: $(OUT)/rp0.dsk $(GT40)
+	$(TOUCH) $@
+
+out/sims/stamp: $(OUT)/rp03.2 $(OUT)/rp03.3 $(GT40)
 	$(TOUCH) $@
 
 $(OUT)/rp0.dsk: build/simh/init $(OUT)/minsys.tape $(OUT)/salv.tape $(OUT)/dskdmp.tape build/build.tcl $(OUT)/sources.tape build/$(EMULATOR)/stamp
@@ -105,6 +109,18 @@ $(OUT)/dskdmp.tape: $(WRITETAPE) $(RAM) $(DSKDMP)
 	$(MKDIR) $(OUT)
 	$(WRITETAPE) -n 2560 $@ $(RAM) $(DSKDMP)
 
+$(OUT)/tmp/gt40/bootvt.bin: $(OUT)/output.tape
+	rm -rf $(OUT)/tmp
+	mkdir -p $(OUT)/tmp
+	$(ITSTAR) -xf $< -C $(OUT)/tmp
+
+tools/dasm/palx: tools/dasm/palx.c
+	$(MAKE) -C tools/dasm palx
+
+$(OUT)/bootvt.img: $(OUT)/tmp/gt40/bootvt.bin tools/dasm/palx
+	mkdir -p out/gt40
+	tools/dasm/palx -I < $< > $@
+
 start: build/$(EMULATOR)/start
 	$(LN) -s $< $*
 
diff --git a/build/basics.tcl b/build/basics.tcl
index efb8daab..0a207e5b 100644
--- a/build/basics.tcl
+++ b/build/basics.tcl
@@ -298,3 +298,11 @@ respond "*" ":link sys;ts dec\021 *,must; be here\r"
 
 respond "*" ":midas decsys;_decbot\r"
 expect ":KILL"
+
+# palx
+respond "*" ":midas sys;ts palx_sysen1;palx\r"
+expect ":KILL"
+
+# GT40 boot ROM.
+respond "*" ":palx gt40;_gt40;bootvt\r"
+expect ":KILL"
diff --git a/build/misc.tcl b/build/misc.tcl
index 363e1008..86d42746 100644
--- a/build/misc.tcl
+++ b/build/misc.tcl
@@ -500,10 +500,6 @@ respond "*" ":midas sys1;ts who%_sysen3;who%\r"
 expect ":KILL"
 respond "*" ":link sys1;ts %,sys1;ts who%\r"
 
-# palx
-respond "*" ":midas sys;ts palx_sysen1;palx\r"
-expect ":KILL"
-
 # Old PALX
 respond "*" ":midas sys3;ts plx143_rms;palx 143\r"
 expect ":KILL"
@@ -1064,10 +1060,6 @@ respond "=YES" "1\r"
 respond "37000" "37000\r"
 expect ":KILL"
 
-# GT40 boot ROM.
-respond "*" ":palx gt40;_gt40;bootvt\r"
-expect ":KILL"
-
 # GT40 Lunar Lander.
 respond "*" ":palx gt40;_gt40;gtlem\r"
 expect ":KILL"
diff --git a/tools/dasm b/tools/dasm
index 1bc11e07..2055ae47 160000
--- a/tools/dasm
+++ b/tools/dasm
@@ -1 +1 @@
-Subproject commit 1bc11e072c4b7c1997331632fe6cad02e8fdae0f
+Subproject commit 2055ae47c8c9955c3b85f066a7065a41d3652492