In this video, I make 8bit SID music on a Commodore 64 without any software apart from the builtin BASIC interpreter. This involves poking numbers into memory and hardware registers and writing machine code in decimal.

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The picture of Walt, borrowed from a C64 demo, was masterfully pixeled by The Sarge.

0:00 Introduction
1:57 Groundwork
8:50 Time and pitch
13:23 Interactive editor
17:11 Note on/off subroutines
23:14 Making a pattern
27:06 Varying the instruments
31:05 Drum hack
32:00 Final jam