Huh, so its isa is just "Dst := Src+Imm", with Dst one of [A,B,Out,PC] and Src one of [A,B,In,Zero] Plus just a tiny bit of logic that wires in "Carry Flag" wh

Huh, so its isa is just "Dst := Src+Imm", with Dst one of [A,B,Out,PC] and Src one of [A,B,In,Zero] Plus just a tiny bit of logic that wires in "Carry Flag" when Src=Zero to control Dst=PC I guess "MOV A,B" sets Imm to zero for simplicity, because I don't see anything stopping it