First working assembler!

stdlib.nrjasm

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+; nrjasm standard library starts here
+
+; custom macros always take 3 values, usually cell addresses (referred to as %A, %B and %C) and defined between .def and .end (no nesting allowed)
+; custom macros are always expanded before the elementary macros
+; if %C is not passed, it is replaced with NXT
+; if %B and/or %A is not passed, it is replaced with HLT
+
+.def .lbl ; define labels
+  .var %A FREE ; allocate a variable with the name in %A, then set it to the next instruciton address:
+  .set @%A NXT ; %A is directly substituted as text, so we can use it after the dereferencing operator
+.end
+
+; define a reusable buffer variable for our following macros
+.var setbuf FREE ; we don't care which address it will actually be
+
+.def MOV ; transfer one cell to another, usage: MOV dst src
+  @setbuf HLT NXT ; first, zero out the setbuf variable by performing NOR with 0xFFFF
+  %A HLT NXT ; then, zero out the destination cell by performing NOR with 0xFFFF
+  @setbuf %B NXT ; then, set setbuf variable to the inverted source value
+  %A @setbuf %C ; finally, set destination cell to the inverted setbuf value ( = source value)
+.end