diff --git a/C0135/board.fs b/C0135/board.fs
new file mode 100644
index 0000000..97d8a3f
--- /dev/null
+++ b/C0135/board.fs
@@ -0,0 +1,32 @@
+#require MBSERVER
+
+  $4000  CONSTANT  EE_NODE
+  $4002  CONSTANT  EE_BAUD
+
+#require :NVM
+#require WIPE
+
+NVM
+#require OUT!
+
+  \ output handler
+  :NVM
+     coils @ OUT!
+  ;NVM ( xt )
+
+  \ --- MODBUS server startup
+  : init ( -- )
+    ( xt ) LITERAL mbact !
+    0 coils !
+
+    EE_BAUD @ ( #BR ) UARTISR
+    EE_NODE @ DUP 0 256 WITHIN NOT IF
+      DROP 1  \ out of range - use default
+    THEN
+    ( n ) mbnode !
+
+    MBSERVER
+  ;
+
+  ' init 'BOOT !
+WIPE RAM
diff --git a/Makefile b/Makefile
index 10bd78f..65f6781 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,4 @@
-STM8EF_BOARD=SWIMCOM
+STM8EF_BOARD=C0135
 STM8EF_VER=2.2.24.pre1
 STM8EF_BIN=stm8ef-bin.zip
 STM8EF_URL=https://github.com/TG9541/stm8ef/releases/download/${STM8EF_VER}/${STM8EF_BIN}
@@ -8,6 +8,8 @@ TERM_PORT=ttyUSB0
 TERM_BAUD=9600
 TERM_FLAGS=
 
+ifeq ($(BOARD),)
+
 # e4thcom style Forth code can't have a file suffix (but filenames are uppercase)
 mmforth:=$(shell echo `ls|gawk '/^[A-Z0-9]*$$/ {print}'`)
 forth=$(wildcard *fs) $(mmforth)
@@ -15,34 +17,31 @@ forth=$(wildcard *fs) $(mmforth)
 .PHONY: test clean
 
 # Usage:make term BOARD=<board dir> [TERM_PORT=ttyXXXX] [TERM_BAUD=nnnn] [TERM_FLAGS="--half-duplex --idm"]
-term:
-	$(E4THCOM) -t stm8ef -p .:lib $(TERM_FLAGS) -d $(TERM_PORT) -b B$(TERM_BAUD)
+all: load
 
-all: flash
+load: flash
+	tools/codeload.py -b out/$(STM8EF_BOARD) -p /dev/$(TERM_PORT) serial main.fs
 
-zip:
-	zip -r ${STM8EF_BOARD}-forth ${STM8EF_BOARD}-forth.ihx
+flash: target defaults
+	stm8flash -c stlinkv2 -p stm8s103f3 -w out/$(STM8EF_BOARD)/$(STM8EF_BOARD).ihx
 
 defaults:
 	stm8flash -c stlinkv2 -p stm8s103f3 -s opt -w tools/stm8s103FactoryDefaults.bin
 
-flash: target
-	stm8flash -c stlinkv2 -p stm8s103f3 -w out/$(STM8EF_BOARD)/$(STM8EF_BOARD).ihx
-
-load: target
-	tools/codeload.py -b out/$(STM8EF_BOARD) -p /dev/$(TERM_PORT) serial main.fs
+test: simload
+	test/mbtest.sh $(STM8EF_BOARD)
 
 simload: $(forth) target
 	tools/simload.sh $(STM8EF_BOARD)
 	touch simload
 
-test: simload
-	test/mbtest.sh $(STM8EF_BOARD)
-
-target: depend
+target: binary
 	rm -f target
 	ln -s out/${STM8EF_BOARD}/target target
 
+binary: depend
+	make BOARD=C0135
+
 depend:
 	if [ ! -d "out" ]; then \
 		curl -# -L -O ${STM8EF_URL}; \
@@ -52,5 +51,18 @@ depend:
 	fi
 	touch depend
 
+term:
+	$(E4THCOM) -t stm8ef -p .:lib $(TERM_FLAGS) -d $(TERM_PORT) -b B$(TERM_BAUD)
+
+zip:
+	zip -r ${STM8EF_BOARD}-forth ${STM8EF_BOARD}-forth.ihx
+
 clean:
-	rm -rf target STM8S103.efr STM8S105.efr simload depend docs lib mcu out inc tools
+	rm -rf target docs lib mcu out inc tools
+	rm -f forth.asm forth.h forth.mk main.c STM8S103.efr STM8S105.efr
+	rm -f simload depend
+
+else
+# the STM8 eForth make is a dependency
+include forth.mk
+endif