diff --git a/vm.pb b/vm.pb
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+++ b/vm.pb
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+; vm
+
+Structure opi
+code.l
+args.s
+EndStructure
+
+; In theory this is a byte code interpreter
+; Also mad science and may not work
+
+
+Procedure writeblock (fid, *opco.opi)
+; used by compile to write compiled code to file
+  WriteByte(fid, *opco\code)
+  WriteLong(fid, Len(*opco\args))
+  WriteData(fid, @*opco\args, Len(*opco\args))
+EndProcedure
+
+Procedure readblock (fid, *opci.opi)
+; should not need to be explained
+  *opci\code = ReadByte(fid)
+  *opci\args = Space(ReadLong(fid))
+  ReadData(fid, @*opci\args, Len(*opci\args))
+EndProcedure
+
+;for demo purposes we hard wire the code
+
+opcobj.opi\code = $01
+opcobj.opi\args = "Hi world"
+
+; now write bytecode to file
+
+OpenFile(0,"test.byc")
+writeblock(0, opcobj)
+CloseFile(0)
+
+; now read
+
+OpenFile(1,"test.byc")
+readblock(1, opcoobj.opi)
+CloseFile(1)
+
+;run
+
+Select opcoobj\code
+
+Case  $01 : MessageRequester("ouput",opcoobj\args)
+
+EndSelect
+
+; IDE Options = PureBasic 4.61 (Windows - x86)
+; CursorPosition = 3
+; Folding = -
+; EnableXP
+; Executable = ..\Desktop\vm.exe
\ No newline at end of file