Yet another fork of loopy's ASM6. This one is based on version 1.6.

New features of ASM6f compared to stock ASM6:

• Support for some illegal/undocumented opcodes. Still very much WIP.
• FCEUX-compatible .nl file export, taken from sonder's fork of ASM6.

asm6f [-options] sourcefile [outputfile] [listfile]

• -? Show help
• -l Create listing
• -L Create verbose listing (expands REPT, MACRO)
• -d<name> Define a symbol and make it equal to 1
• -q Quiet mode; suppress all output unless there's an error
• -n Export FCEUX-compatible .nl files
• -f Export Lua symbol file
• -c Export .cdl for use with FCEUX/Mesen
• -m Export Mesen-compatible label file (.mlb)

The default value for [outputfile] is <sourcefile>.bin, and the default for [listfile] is <sourcefile>.lst. .nl files are exported per PRG bank, as well as one for the RAM region.

• Add an undef command?
• Add a -d<name>=<value> option to set symbols to a specified value.
• Add CA65 debugging format for NintendulatorDX usage.