Simple C64 SID Player in ASM/C for CC65

(c) 2018 SolidCore

GNU General Public License v3.0

Requirements

• CC65: https://www.cc65.org/
• Sidreloc: https://www.linusakesson.net/software/sidreloc/index.php
• Unix or Windows GNU Make: https://www.gnu.org/software/make/
• Vice C64 Emulator: http://vice-emu.sourceforge.net/ or similiar
• SID file

How to use

This is a quick and dirty guide, but simply run

1. ./sidereloc -p 40 input.sid output.sid

   A quick glance at -p tells us:

   -p --page 10 First memory page (in hex) to be occupied by the relocated SID.

   so in our case $4000

2. Using vim or your favourite text editor modify asm.s and set "filename.sid" to your output.sid.

3. Make

4. Open 'main.prg' in your favourite emulator.

Finding and Relocating SID Init and Play address

Tools such as 'SIDPlay2/w' offer a great insight into the SID file headers,

In some cases the SID file will have a rather obscure address 'Load Range' $E000-$ECE0, using sidereloc we can relocate to a specific 'memory page' which in our case will be '-p 40' == $4000, which now makes it $4000-$4CE0.

Further reading: https://www.hvsc.c64.org/download/C64Music/DOCUMENTS/SID_file_format.txt