diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..4b1cf55
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,135 @@
+TARGET               = toolbox
+TARGET_RAM           = $(TARGET)_ram
+TARGET_ROM           = $(TARGET)_rom
+
+UNIT                 = F256K
+
+SRCS_BASE            = boot.c \
+                       log.c \
+                       memory.c \
+                       proc.c \
+                       ring_buffer.c \
+                       simpleio.c \
+                       sys_general.c \
+                       timers.c \
+                       toolbox.c \
+                       utilities.c \
+                       dev/block.c \
+                       dev/channel.c \
+                       dev/console.c \
+                       dev/fsys.c \
+                       dev/sprites.c \
+                       dev/tiles.c \
+                       dev/txt_screen.c \
+                       dev/rtc.c \
+                       dev/uart.c \
+                       snd/codec_c256.c \
+                       snd/psg.c \
+                       snd/sid.c \
+                       fatfs/ff.c \
+                       fatfs/ffsystem.c \
+                       fatfs/ffunicode.c
+
+SRCS_BASE_F256       = cartridge.c \
+                       dev/txt_f256.c \
+                       dev/kbd_f256.c \
+                       dev/indicators_c256.c \
+                       dev/interrupts_f256.c \
+                       dev/sdc_f256.c \
+                       dev/iec.c \
+                       fatfs/toolbox_bdev.c \
+                       C256/extras.s \
+                       C256/f256-cstartup.s \
+                       C256/iecll.s \
+                       C256/interrupts.s \
+                       C256/io_stubs.c \
+                       C256/jumptable.s
+
+ifeq ($(UNIT),F256)
+	TOOLCHAIN            = 65816
+	SRCS_FOR_UNIT        = $(SRCS_BASE_F256) dev/kbd_f256jr.c
+	CFLAGS_FOR_UNIT      = -DMODEL=2 -DCPU=255 --target=f256
+	LDFLAGS_FOR_UNIT_ROM = src/C256/f256-flash.scm --cstartup=f256
+	LDFLAGS_FOR_UNIT_RAM = src/C256/f256-ld_lc.scm --cstartup=f256
+else ifeq ($(UNIT),F256JR2)
+	TOOLCHAIN            = 65816
+	SRCS_FOR_UNIT        = $(SRCS_BASE_F256) dev/kbd_f256jr.c
+	CFLAGS_FOR_UNIT      = -DMODEL=35 -DCPU=255 --target=f256
+	LDFLAGS_FOR_UNIT_ROM = src/C256/f256k2-flash.scm --cstartup=f256
+	LDFLAGS_FOR_UNIT_RAM = src/C256/f256-ld_lc.scm --cstartup=f256
+else ifeq ($(UNIT),F256K)
+	TOOLCHAIN            = 65816
+	SRCS_FOR_UNIT        = $(SRCS_BASE_F256) dev/kbd_f256k.c
+	CFLAGS_FOR_UNIT      = -DMODEL=18 -DCPU=255 --target=f256
+	LDFLAGS_FOR_UNIT_ROM = src/C256/f256-flash.scm --cstartup=f256
+	LDFLAGS_FOR_UNIT_RAM = src/C256/f256-ld_lc.scm --cstartup=f256
+else ifeq ($(UNIT),F256K2)
+	TOOLCHAIN            = 65816
+	SRCS_FOR_UNIT        = $(SRCS_BASE_F256) dev/kbd_f256k.c
+	CFLAGS_FOR_UNIT      = -DMODEL=17 -DCPU=255 --target=f256
+	LDFLAGS_FOR_UNIT_ROM = src/C256/f256k2-flash.scm --cstartup=f256
+	LDFLAGS_FOR_UNIT_RAM = src/C256/f256-ld_lc.scm --cstartup=f256
+else
+	$(error "Unrecognized UNIT: $(UNIT)")
+endif
+
+ifeq ($(TOOLCHAIN),65816)
+	ifeq ($(strip $(CALYPSI_65816_ROOT)),)
+		$(error "Please set CALYPSI_65816_ROOT in your environment!")
+	endif
+
+	CC             = cc65816
+	AS             = as65816
+	LD             = ln65816
+	TOOLCHAIN_ROOT = $(CALYPSI_65816_ROOT)
+else
+	$(error "Unrecognized TOOLCHAIN: $(TOOLCHAIN)")
+endif
+
+SRC_DIR           = src
+SRC_FILES         = $(addprefix $(SRC_DIR)/, $(SRCS_BASE) $(SRCS_FOR_UNIT))
+INCLUDE_DIRS      = $(SRC_DIR) $(SRC_DIR)/include $(TOOLCHAIN_ROOT)/include
+INCLUDES          = $(foreach dir,$(INCLUDE_DIRS),-I$(dir))
+
+OBJ_DIR           = obj
+OBJ_FILES         = $(addprefix $(OBJ_DIR)/, $(addsuffix .o, $(SRC_FILES)))
+
+DEPS_DIR          = $(OBJ_DIR)
+DEPENDS           = $(OBJ_FILES:.o=.d)
+
+CFLAGS            = --code-model=large --data-model=large --list-file=$@.lst $(INCLUDES) $(CFLAGS_FOR_UNIT)
+AFLAGS            = --code-model=large --data-model=large $(INCLUDES)
+
+LDFLAGS_FOR_ROM   = --rom-code $(LDFLAGS_FOR_UNIT_ROM)
+LDFLAGS_FOR_RAM   = $(LDFLAGS_FOR_UNIT_RAM)
+
+.PHONY: clean
+
+all: rom ram
+
+rom: $(TARGET_ROM).s37
+
+ram: $(TARGET_RAM).s37
+
+clean:
+	rm -f *.s37
+	rm -f *.lst
+	rm -rf $(OBJ_DIR)
+
+$(TARGET_ROM).s37: $(OBJ_FILES)
+	$(LD) -o $@ $^ $(LDFLAGS_FOR_ROM) --output-format=s37 --list-file=$@.lst
+
+$(TARGET_RAM).s37: $(OBJ_FILES)
+	$(LD) -o $@ $^ $(LDFLAGS_FOR_RAM) --output-format=s37 --list-file=$@.lst
+
+$(OBJ_DIR)/%.c.o: %.c
+	@mkdir -p $(dir $@)
+	$(CC) -MMD -MP -MF$(DEPS_DIR)/$*.d $(CFLAGS) -o $@ $<
+
+$(OBJ_DIR)/%.s.o: %.s
+	@mkdir -p $(dir $@)
+	$(AS) $(AFLAGS) -o $@ $<
+
+-include $(DEPENDS)
+
+