F8tool is an assembler AND disassembler to assemble your code into a binary file and to make binary files understandable by translating it into rudimentary assembler again.
The disassembly does currently not mask out data areas, everything is interpreted as OP-codes.
Here are the instructions to run it:
"f8tool asm file.asm file.bin" will compile file.asm and give you file.bin.
"f8tool dis file.bin > file.asm 2048" will disassemble file.bin giving you
file.asm starting at address 2048 (which is $800).