Super-Mario-style controller tuner. Fixed 50 Hz timestep = 1 PAL frame, so every constant you tune is exported verbatim as 8.8 fixed-point for a 6502 game loop running once per VBLANK.
.word stores low-byte-first,
which is exactly the order a 6502 16-bit add wants. The header comment block in the output
includes a ready-to-paste pos += vel routine.