#test-bit
- Ring modulation and oscillator sync techniqueTwo of the sid 's control-register bits couple a voice to its neighbour: sync ( $02 ) hard-syncs one oscillator to another, ring ( $04 ) replaces a voice's triangle output with a ring-modulated combination of the two. …
- Asger Alstrup — Examination of SID triangle waveform / noise waveform (The SID Homepage, 1995) summaryTwo pages of measurements from andreas-varga 's SID Homepage ( sid-homepage ). asger-alstrup read voice 3's waveform output register $D41B on a real C64 once per clock cycle — a REU (RAM Expansion Unit) DMA transfer of …