Building:

NOTE: "src/smb_chr.chr" is required to assemble. (Not included.)

Run either `make`, or `make debug`

They both will build the .nes rom, but one will also output debug data. 
(Try it and load the rom in NintendulatorDX and step through the code.)
`make clean` will just delete all files in that could be created by either `make`

all the credit to [Movax12](https://www.romhacking.net/community/2056/), original version available at [romhacking.net](https://www.romhacking.net/documents/635/)