.COP file playback

[flatduckrecords]

I've been enjoying @Stefan's SAA1099 sound chip oscilloscope videos and it got me wondering how to play the tunes back directly on SAM.


Arcane Zone Part 2 by Yerzmyey.

I understand .cop files are compiled E-Tracker songs - but is there a quick way to tell if the player routine has been merged in, and if so what the init and play addresses are?

I disassembled a few tunes and found that 0x8000/0x8006 is common, but not universal. I wanted to make a BASIC playlist disk with a few tracks from ZX-Art so I was hoping they'd mostly stick to the same offsets! Is that not the case?

Code: Select all

10 LOAD "SONG.COP"
20 CALL &8000
30 DO: CALL &8006: PAUSE 1: LOOP

[Stefan]

The .cop files may or may not contain the etracker player. They are all etracker compiled tunes. You can recognize if the player is tacked on by looking for the etracker signature (see my GitHub for etracker player disassembly).

Also beware of the etracker compiled player bugs, for the videos I always decompile the compiled tunes, load them into etracker and record from there.

Update: sorry, memory failure. The compiled tune contains the signature, not the player. When playing these back I look for a tell tale ld hl,x - see https://github.com/stefandrissen/e-trac ... play.s#L36

[flatduckrecords]

The compiled tune contains the signature, not the player. When playing these back I look for a tell tale ld hl,x - see https://github.com/stefandrissen/e-trac ... play.s#L36

Aha, perfect. Thank you.

[g0blinish]

ZX tune plays .cop too

[flatduckrecords]

ZX tune plays .cop too

Thanks! I've also been using Audio Overload but it seems to be struggling with .cop files. ZX Tune's playback is much better.

[g0blinish]

yes, check the tune
https://www.pouet.net/prod.php?which=66504