MODTracker audio replay on early 68k macs

[8bitbubsy]

Yah, MOVEM would obviously give the best thruput, but I think it's hackish to put the lower byte (which can be any arbitrary value) of my 16-bit mixing buffer into the floppy drive motor speed register.

 

[8bitbubsy]

I have attached a sound recording of my software-mix PT player port playing Jester's "My Glamorous Life" on a 7.09MHz Amiga 500 in WinUAE (cycle-accurate mode). I have disabled the Amiga's 4.4kHz low-pass filter to retain that sharpness that will most likely be present on a compact Mac.

The Mac port should sound equal to this. I just hope it's going to be fast enough.

Here's the asm code for it (messy at the moment): https://www.dropbox.com/scl/fi/1ggb8tx9us8un9rdfxkjl/modplay.s?rlkey=olw8ry1b9e1x6t6fuzrc392cs&dl=1