diff --git a/Makefile b/Makefile
index 4aad70f4..a353ace9 100644
--- a/Makefile
+++ b/Makefile
@@ -16,8 +16,8 @@ CAT ?= cat
 include conf/network
 
 # The directores listed in SRC, DOC, and BIN are put on the sources tape.
-SRC = system syseng sysen1 sysen2 sysen3 sysnet kshack dragon channa	\
-      midas _teco_ emacs emacs1 rms klh syshst sra mrc ksc eak gren	\
+SRC = syseng sysen1 sysen2 sysen3 sysnet kshack dragon channa	\
+      _teco_ emacs emacs1 rms klh syshst sra mrc ksc eak gren	\
       bawden _mail_ l lisp libdoc comlap lspsrc nilcom rwk chprog rg	\
       inquir acount gz sys decsys ecc alan sail kcc kcc_sy c games archy dcp \
       spcwar rwg libmax rat z emaxim rz maxtul aljabr cffk das ell ellen \
@@ -34,11 +34,14 @@ DOC = info _info_ sysdoc sysnet syshst kshack _teco_ emacs emacs1 c kcc \
 BIN = sys2 emacs _teco_ lisp liblsp alan inquir sail comlap c decsys \
       moon graphs draw datdrw fonts fonts1 fonts2 games macsym maint imlac \
       _www_ hqm
+MINSRC = midas system $(DDT) $(SALV) $(KSFEDR) $(DUMP)
 
 # These are not included on the tape.
 DOCIGNORE=-e '\.(jpeg|pdf|info|md)$$' -e '^(dcg|github)$$'
 # These are on the minsys tape.
 BINIGNORE=-e '^(ka10|ks10|sys)$$'
+# These are on the minsrc tape.
+SRCIGNORE=-e '^(system|midas)$$'
 
 SUBMODULES = dasm itstar klh10 mldev simh sims supdup tapeutils
 
@@ -56,6 +59,10 @@ MAGFRM=tools/dasm/magfrm
 GT40=tools/simh/BIN/pdp11 $(OUT)/bootvt.img
 
 H3TEXT=$(shell cd build; ls h3text.*)
+DDT=$(shell cd src; ls sysen1/ddt.* syseng/lsrtns.* syseng/msgs.* syseng/datime.*)
+SALV=$(shell cd src; ls kshack/nsalv.* syseng/format.* syseng/rfn.*)
+KSFEDR=$(shell cd src; ls kshack/ksfedr.*)
+DUMP=$(shell cd src; ls syseng/dump.* sysnet/netwrk.*)
 SMF:=$(addprefix tools/,$(addsuffix /.gitignore,$(SUBMODULES)))
 OUT=out/$(EMULATOR)
 
@@ -72,21 +79,26 @@ out/simh/stamp: $(OUT)/rp0.dsk $(GT40)
 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
+$(OUT)/rp0.dsk: build/simh/init $(OUT)/minsys.tape $(OUT)/minsrc.tape $(OUT)/salv.tape $(OUT)/dskdmp.tape build/build.tcl $(OUT)/sources.tape build/$(EMULATOR)/stamp
 	PATH="$(CURDIR)/tools/simh/BIN:$$PATH" expect -f build/$(EMULATOR)/build.tcl $(IP) $(GW)
 
-$(OUT)/rp03.2 $(OUT)/rp03.3: $(OUT)/ka-minsys.tape $(OUT)/magdmp.tap $(OUT)/sources.tape
+$(OUT)/rp03.2 $(OUT)/rp03.3: $(OUT)/ka-minsys.tape $(OUT)/minsrc.tape $(OUT)/magdmp.tap $(OUT)/sources.tape
 	$(EXPECT) -f build/$(EMULATOR)/build.tcl $(IP) $(GW)
 
 $(OUT)/magdmp.tap: $(MAGFRM)
 	cd bin/ka10/boot; ../../../$(MAGFRM) @.ddt @.salv > ../../../$@
 
-$(OUT)/minsys.tape: $(ITSTAR)
+$(OUT)/minsrc.tape: $(ITSTAR)
+	$(MKDIR) $(OUT)
+	$(ITSTAR) -cf $@ -C src $(MINSRC)
+	$(ITSTAR) -rf $@ -C $(OUT) system
+
+$(OUT)/minsys.tape: $(ITSTAR) $(OUT)/system
 	$(MKDIR) $(OUT)
 	$(ITSTAR) -cf $@ -C bin/ks10 _ sys
 	$(ITSTAR) -rf $@ -C bin sys
 
-$(OUT)/ka-minsys.tape: $(ITSTAR)
+$(OUT)/ka-minsys.tape: $(ITSTAR) $(OUT)/system
 	$(MKDIR) $(OUT)
 	$(ITSTAR) -cf $@ -C bin/ka10 _ sys
 	$(ITSTAR) -rf $@ -C bin sys
@@ -100,7 +112,7 @@ $(OUT)/sources.tape: $(ITSTAR) build/$(EMULATOR)/stamp $(OUT)/syshst/$(H3TEXT)
 	$(ITSTAR) -cf $@ -C src $(SRC)
 	$(ITSTAR) -rf $@ -C doc $(DOC)
 	$(ITSTAR) -rf $@ -C bin $(BIN)
-	$(ITSTAR) -rf $@ -C $(OUT) system syshst
+	$(ITSTAR) -rf $@ -C $(OUT) syshst
 	-cd user; ../$(ITSTAR) -rf ../$@ *
 
 $(OUT)/salv.tape: $(WRITETAPE) $(RAM) $(NSALV)
@@ -129,6 +141,15 @@ start: build/$(EMULATOR)/start
 	$(LN) -s $< $*
 
 build/klh10/stamp: $(KLH10) start build/klh10/dskdmp.ini
+	$(TOUCH) $@
+
+build/simh/stamp: $(SIMH) start
+	$(TOUCH) $@
+
+build/sims/stamp: $(KA10) start
+	$(TOUCH) $@
+
+out/klh10/system:
 	$(MKDIR) $(OUT)/system
 	cp=0; ca=0; \
 	$(TEST) $(CHAOS) != no && cp=1 && ca=$(CHAOS); \
@@ -137,17 +158,14 @@ build/klh10/stamp: $(KLH10) start build/klh10/dskdmp.ini
 	    -e 's/%NETMASK%/$(NETMASK)/' \
 	    -e "s/%CHAOSP%/$$cp/" \
 	    -e "s/%CHAOSA%/$$ca/" < build/klh10/config.203 > $(OUT)/system/config.203
-	$(TOUCH) $@
 
-build/simh/stamp: $(SIMH) start
+out/simh/system:
 	$(MKDIR) $(OUT)/system
 	cp build/simh/config.* $(OUT)/system
-	$(TOUCH) $@
 
-build/sims/stamp: $(KA10) start
+out/sims/system:
 	$(MKDIR) $(OUT)/system
 	cp build/sims/config.* $(OUT)/system
-	$(TOUCH) $@
 
 build/klh10/dskdmp.ini: build/klh10/dskdmp.txt Makefile
 	cp=';'; ca=''; \
@@ -204,7 +222,7 @@ tools/simh/BIN/pdp11:
 check-dirs: Makefile
 	mkdir -p $(OUT)/check
 	echo $(SRC) | tr ' ' '\n' | sort > $(OUT)/check/src1
-	cd src; ls -1 > ../$(OUT)/check/src2
+	cd src; ls -1 | egrep -v $(SRCIGNORE) > ../$(OUT)/check/src2
 	diff -u $(OUT)/check/src1 $(OUT)/check/src2 > $(OUT)/check/src.diff
 	echo $(DOC) | tr ' ' '\n' | sort > $(OUT)/check/doc1
 	cd doc; ls -1d */ | tr -d / | sort | \
diff --git a/build/basics.tcl b/build/basics.tcl
index 3c0c6a1a..d3a91415 100644
--- a/build/basics.tcl
+++ b/build/basics.tcl
@@ -8,6 +8,21 @@ sleep 1
 
 type ":rename .;@ its, .;@ oits\r"
 respond "*" ":rename .;@ nits, .;@ its\r"
+sleep 1
+
+respond "*" ":midas sysbin;_syseng;dump\r"
+dump_switches
+expect ":KILL"
+respond "*" ":delete sys;ts dump\r"
+respond "*" ":link sys;ts dump,sysbin;dump bin\r"
+respond "*" ":link sys;ts load,sys;ts dump\r"
+
+type ":dump\r"
+respond "_" "load links crdir sorry\r"
+respond "FILE=" "*;* *\r"
+expect -timeout 3000 "E-O-T"
+respond "_" "quit\r"
+expect ":KILL"
 
 # Free up some disk space on the pack holding most source code.
 gfr_second
@@ -45,13 +60,6 @@ expect ":KILL"
 respond "*" ":midas sys1;ts magfrm_syseng;magfrm\r"
 expect ":KILL"
 
-respond "*" ":midas sysbin;_syseng;dump\r"
-dump_switches
-expect ":KILL"
-respond "*" ":delete sys;ts dump\r"
-respond "*" ":link sys;ts dump,sysbin;dump bin\r"
-respond "*" ":link sys;ts load,sys;ts dump\r"
-
 respond "*" ":midas sys1;ts stink_sysen2;stink\r"
 expect ":KILL"
 
diff --git a/build/klh10/build.tcl b/build/klh10/build.tcl
index 3f1be9e9..7dbfbcc7 100644
--- a/build/klh10/build.tcl
+++ b/build/klh10/build.tcl
@@ -17,12 +17,20 @@ proc restart_nsalv {} {
     start_salv
 }
 
-proc start_dskdmp {} {
+proc start_dskdmp args {
+    global out
+    set tape ""
+    if {[llength $args] == 1} {
+        set tape [lindex $args 0]
+    } {
+        set tape "$out/sources.tape"
+    }
     #respond "KLH10>" "zero\r"
     quit_emulator
     uplevel #0 {spawn ./kn10-ks-its dskdmp.ini}
     setup_timeout
     expect "EOF"
+    respond "KLH10#" "devmo mta0 ../../$tape\r"
     respond "KLH10#" "go\r"
 }
 
diff --git a/build/ks10/include.tcl b/build/ks10/include.tcl
index c214df1a..e350c9d2 100644
--- a/build/ks10/include.tcl
+++ b/build/ks10/include.tcl
@@ -1,5 +1,6 @@
 proc start_dskdmp_its {} {
-    start_dskdmp
+    global out
+    start_dskdmp $out/minsys.tape
 
     respond "DSKDMP" "l\033ddt\r"
     respond "\n" "t\033its rp06\r"
@@ -61,8 +62,9 @@ proc prepare_frontend {} {
 
     respond "*" ":login db\r"
     sleep 1
+    
     type $emulator_escape
-    mount_tape "$out/sources.tape"
+    mount_tape "$out/minsrc.tape"
 }
 
 proc frontend_bootstrap {} {
diff --git a/build/mark.tcl b/build/mark.tcl
index 72420f7a..601b4496 100644
--- a/build/mark.tcl
+++ b/build/mark.tcl
@@ -20,9 +20,7 @@ sleep 1
 prepare_frontend
 
 type ":dump\r"
-respond "_" "reload "
-respond "ARE YOU SURE" "y"
-respond "\n" "links crdir sorry\r"
+respond "_" "load links crdir sorry\r"
 respond "FILE=" "*;* *\r"
 expect -timeout 3000 "E-O-T"
 respond "_" "quit\r"
diff --git a/build/simh/build.tcl b/build/simh/build.tcl
index 35119f7d..8bf65fd3 100644
--- a/build/simh/build.tcl
+++ b/build/simh/build.tcl
@@ -16,8 +16,15 @@ proc restart_nsalv {} {
     expect "MTBOOT"
 }
 
-proc start_dskdmp {} {
+proc start_dskdmp args {
     global out
+    set tape ""
+    if {[llength $args] == 1} {
+        set tape [lindex $args 0]
+    } {
+        set tape "$out/sources.tape"
+    }
+    respond "sim>" "at tu0 $tape\r"
     respond "sim>" "at tu2 $out/dskdmp.tape\r"
     respond "sim>" "b tu2\r"
     respond "MTBOOT" "\033g"
diff --git a/build/sims/boot b/build/sims/boot
index 419eca92..b3e5bad0 100644
--- a/build/sims/boot
+++ b/build/sims/boot
@@ -3,7 +3,7 @@ set cpu its
 set cpu 512k
 set pd off
 at ptr bin/ka10/boot/dskdmp.rim
-at mta0 out/sims/sources.tape
+at mta0 out/sims/minsrc.tape
 at dpa0 out/sims/rp03.2
 at dpa1 out/sims/rp03.3
 set dpa noheaders
diff --git a/build/sims/boot2 b/build/sims/boot2
index 252a9042..01771d6d 100644
--- a/build/sims/boot2
+++ b/build/sims/boot2
@@ -5,6 +5,7 @@ set cpu mpx
 set cpu ten11
 set pd off
 at ptr bin/ka10/boot/dskdmp.rim
+at mta0 out/sims/sources.tape
 set mta mpx=7
 set mta type=b
 at dpa0 out/sims/rp03.2