SID

Memory Addresses of the FPGA SID in the C256

address	function
$AF:E400	frequency voice 1 low byte
$AF:E401	frequency voice 1 high byte
$AF:E402	pulse wave duty cycle voice 1 low byte
$AF:E403	pulse wave duty cycle voice 1 high byte
$AF:E404	control register voice 1
$AF:E405	attack/decay duration voice 1
$AF:E406	sustain/release duration voice 1
$AF:E407	frequency voice 2 low byte
$AF:E408	frequency voice 2 high byte
$AF:E409	pulse wave duty cycle voice 2 low byte
$AF:E40A	pulse wave duty cycle voice 2 high byte
$AF:E40B	control register voice 2
$AF:E40C	attack/decay duration voice 2
$AF:E40D	sustain/release duration voice 2
$AF:E40E	frequency voice 3 low byte
$AF:E40F	frequency voice 3 high byte
$AF:E410	pulse wave duty cycle voice 3 low byte
$AF:E411	pulse wave duty cycle voice 3 high byte
$AF:E412	control register voice 3
$AF:E413	attack/decay duration voice 3
$AF:E414	sustain/release duration voice 3
$AF:E415	filter cutoff frequency low byte
$AF:E416	filter cutoff frequency high byte
$AF:E417	filter resonance and routing
$AF:E418	filter mode and main volume control
$AF:E419	paddle x value (not used on C256)
$AF:E41A	paddle y value (not used on C256)
$AF:E41B	oscillator voice 3 (read only)
$AF:E41C	envelope voice 3 (read only)
$AF:E41D	not used
$AF:E41E	not used
$AF:E41F	not used