IRQ-Driven SID Music: Commodore 64 BASIC and Machine Language
Автор: 8-Bit Show And Tell
Загружено: 2019-08-16
Просмотров: 38783
We take a look at several techniques to play SIDs on a C64, starting with a very simple BASIC method, and then working up to raster interrupts in machine language. Download the player: https://psw.ca/prg/musicplayer.d64
Links:
High Voltage Sid Collection: http://hvsc.c64.org/
PSID64: http://psid64.sourceforge.net/
Index:
0:00 A request - and a donation!
1:20 A bit about SIDs
2:37 Converting .sid to .prg with PSID64
5:47 Playing the SID from BASIC ** I should have spelled out that the converted SID needs to be loaded first, with LOAD”SONG”,8,1
8:32 Simplest machine language implementation - busy loop, no IRQs yet
10:39 Looking for zero page conflicts
13:36 CIA IRQ-driven player
18:43 Moving the start of BASIC to protect the music
21:17 Raster IRQ-driven player
26:57 Some final words
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