An assembler made using Python. It exports to binary.

Download Python 3. Then, to run the file, use python pyasm.py [output file]. Done!

mov r8, imm8
mov r16, imm16
cli
hlt
int3
into
int xx
db byte
jmp <label>
fill <byte> <times>
fillu <byte> <bytes until the file is>
inc r8
inc r16
dec r8
dec r16

Note that all numbers are in hexadecimal, except for fill and fillu.
Example of a label: label:

#incbin "binary file"

Open an issue or send a pull request.