Converted monitor to asz80 to allow a more modular design

Makefile

@@ -1,19 +1,67 @@
-BUILDDIR=.build
-_BIN= rom_monitor.bin ram_monitor.bin MONITOR.COM
-BIN = $(patsubst %,$(BUILDDIR)/%,$(_BIN))
+# BUILDDIR=.build
+# _BIN= rom_monitor.bin ram_monitor.bin MONITOR.COM
+# BIN = $(patsubst %,$(BUILDDIR)/%,$(_BIN))
+#
+# .PHONY: all clean
+#
+# all: $(BUILDDIR) $(BIN)
+#
+# $(BUILDDIR)/%.bin: src/%.z80 | $(BUILDDIR)
+# 	@zasm -w -i $< -o $@
+#
+# $(BUILDDIR)/%.COM: src/%.z80 | $(BUILDDIR)
+# 	@zasm -w -i $< -o $@
+#
+# $(BUILDDIR):
+# 	@mkdir $(BUILDDIR)
+#
+# clean:
+# 	@rm -df $(BUILDDIR)/*.bin $(BUILDDIR)/*.COM $(BUILDDIR)/*.lst .build
+
+AS = sdasz80
+LD = sdldz80
+OBJCOPY = sdobjcopy
+
+BUILD = .build
+
+TARGET_ROM = rom_monitor
+TARGET_COM = MONITOR
+
+ASFLAGS = -plosff
+
+SRC_ROM = \
+src/monitor.s \
+src/rom.s
+SRC_COM = \
+src/monitor.s \
+src/cpm.s
+
+OBJ_ROM = $(addprefix $(BUILD)/, $(notdir $(SRC_ROM:.s=.rel)))
+OBJ_COM = $(addprefix $(BUILD)/, $(notdir $(SRC_COM:.s=.rel)))
+vpath %.s $(sort $(dir $(SRC_ROM)))
+vpath %.s $(sort $(dir $(SRC_COM)))
 
 .PHONY: all clean
 
-all: $(BUILDDIR) $(BIN)
+all: $(BUILD) $(BUILD)/$(TARGET_ROM).bin $(BUILD)/$(TARGET_COM).COM
 
-$(BUILDDIR)/%.bin: src/%.z80 | $(BUILDDIR)
-	@zasm -w -i $< -o $@
+$(BUILD)/%.rel: %.s Makefile | $(BUILD)
+	$(AS) $(ASFLAGS) $@ $<
 
-$(BUILDDIR)/%.COM: src/%.z80 | $(BUILDDIR)
-	@zasm -w -i $< -o $@
+$(BUILD)/$(TARGET_ROM).ihx: $(OBJ_ROM)
+	$(LD) -im1 $@ $(OBJ_ROM) -b BOOT=0x0000
 
-$(BUILDDIR):
-	@mkdir $(BUILDDIR)
+$(BUILD)/$(TARGET_COM).ihx: $(OBJ_COM)
+	$(LD) -im1 $@ $(OBJ_COM) -b BOOT=0x0100 -b MAIN=0xE200
+
+%.bin: %.ihx
+	$(OBJCOPY) -I ihex -O binary $< $@
+
+%.COM: %.ihx
+	$(OBJCOPY) -I ihex -O binary $< $@
+
+$(BUILD):
+	mkdir $@
 
 clean:
-	@rm -df $(BUILDDIR)/*.bin $(BUILDDIR)/*.COM $(BUILDDIR)/*.lst .build
+	rm -fr $(BUILD)