dev: fixed assembly errors, added linker script and Makefile

Additionally created a .gitignore to avoid committing object
code and output formats

.gitignore

@@ -0,0 +1,16 @@
+# Created by https://www.toptal.com/developers/gitignore/api/assembler
+# Edit at https://www.toptal.com/developers/gitignore?templates=assembler
+
+### Assembler ###
+*.exe
+*.o
+*.obj
+*.bc
+
+# Output
+*.hex
+*.srec
+*.s19
+*.elf
+# End of https://www.toptal.com/developers/gitignore/api/assembler
+

Makefile

@@ -0,0 +1,21 @@
+ASM=vasm_z80_std
+LINK=vlink
+
+ASMFLAGS=-Fvobj
+LINKFLAGS=-b ihex -T linker.cmd
+
+all: float.hex
+
+float.o: float.asm
+	$(ASM) $(ASMFLAGS) -o $@ $<
+
+printChar.o: printChar.asm
+	$(ASM) $(ASMFLAGS) -o $@ $<
+
+float.hex: float.o printChar.o linker.cmd
+	$(LINK) $(LINKFLAGS) -o $@ float.o printChar.o
+
+clean:
+	rm -f float.o printChar.o float.hex
+
+.PHONY: all clean

linker.cmd

@@ -0,0 +1,6 @@
+SECTIONS
+{
+  .text  0xE000 : { *(.text) }
+  .data  0x7000 : { *(.data) }
+  .bss         : { *(.bss)  }
+}

printChar.asm

@@ -0,0 +1,4 @@
+; Stub printChar: does nothing
+.global printChar
+printChar:
+    ret