diff --git a/.gitignore b/.gitignore
index b638a17..60a528d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -12,4 +12,5 @@ __pycache__
 *.gch
 scramble
 cdi4dc
-tools/ttf_outline
\ No newline at end of file
+tools/ttf_outline
+*.blend1
diff --git a/common.mk b/common.mk
index 25146ff..5a0d1f9 100644
--- a/common.mk
+++ b/common.mk
@@ -130,6 +130,9 @@ audio.pcm:
 %.data.o: %.data
 	$(BUILD_BINARY_O)
 
+regs/%.csv: regs/%.ods
+	libreoffice --headless -convert-to csv:"Text - txt - csv (StarCalc)":44,34,76,,,,true --outdir regs/ $<
+
 maple/maple_bus_commands.hpp: regs/maple_bus_commands.csv regs/gen/maple_bus_commands.py
 	python regs/gen/maple_bus_commands.py $< > $@
 
diff --git a/example/example.mk b/example/example.mk
index 332b821..0a2adcf 100644
--- a/example/example.mk
+++ b/example/example.mk
@@ -249,3 +249,10 @@ SERIAL_TRANSFER_OBJ = \
 
 example/serial_transfer.elf: LDSCRIPT = $(LIB)/alt.lds
 example/serial_transfer.elf: $(START_OBJ) $(SERIAL_TRANSFER_OBJ)
+
+INTERRUPT_OBJ = \
+	example/interrupt.o \
+	serial.o
+
+example/interrupt.elf: LDSCRIPT = $(LIB)/alt.lds
+example/interrupt.elf: $(START_OBJ) $(INTERRUPT_OBJ)
diff --git a/geometry/heart.blend b/geometry/heart.blend
index f5d2fc3..9ed07af 100644
Binary files a/geometry/heart.blend and b/geometry/heart.blend differ
diff --git a/regs/maple_bus_ft0.ods b/regs/maple_bus_ft0.ods
index c9d3363..2cbaf1a 100644
Binary files a/regs/maple_bus_ft0.ods and b/regs/maple_bus_ft0.ods differ