# Quazar SID Interface ## SID Programming - [https://www.c64-wiki.com/wiki/SID](https://www.c64-wiki.com/wiki/SID) - [MOS6581\_SID\_data\_sheet.pdf](https://wiki.hexadust.net/attachments/98) [![1000013963.png](https://wiki.hexadust.net/uploads/images/gallery/2025-10/scaled-1680-/WKRcb1sNtAWNH5vf-1000013963.png)](https://wiki.hexadust.net/uploads/images/gallery/2025-10/WKRcb1sNtAWNH5vf-1000013963.png) ## Memory Addresses of the SID

	7..4				3..0
Reg	Function
0	frequency voice 1 low byte
1	frequency voice 1 high byte
2	pulse wave duty cycle voice 1 low byte
3	—				pulse wave duty cycle voice 1 high byte
4	control register voice 1
	7	6	5	4	3	2	1	0
	noise	pulse	sawtooth	triangle	test	ring modulation with voice 3	synchronize with voice 3	gate
	7..4				3..0
5	attack duration				decay duration voice 1
6	sustain level				release duration
7	frequency voice 2 low byte
8	frequency voice 2 high byte
9	pulse wave duty cycle voice 2 low byte
	7..4				3..0
10	—				pulse wave duty cycle voice 2 high byte
11	control register voice 2
	7	6	5	4	3	2	1	0
	noise	pulse	sawtooth	triangle	test	ring modulation with voice 1	synchronize with voice 1	gate
	7..4				3..0
12	attack duration				decay duration voice 2
13	sustain level				release duration voice 2
14	frequency voice 3 low byte
15	frequency voice 3 high byte
16	pulse wave duty cycle voice 3 low byte
	7..4				3..0
17	—				pulse wave duty cycle voice 3 high byte
18	control register voice 3
	7	6	5	4	3	2	1	0
	noise	pulse	sawtooth	triangle	test	ring modulation with voice 2	synchronize with voice 2	gate
	7..4				3..0
19	attack duration				decay duration voice 3
20	sustain level				release duration voice 3
21	—					filter cutoff frequency low byte
22	filter cutoff frequency high byte
23	filter resonance and routing
	7..4				3	2	1	0
	filter resonance				external input	voice 3	voice 2	voice 1
24	filter mode and main volume control
	7	6	5	4	3..0
	mute voice 3	high pass	band pass	low pass	main volume
25	paddle x value (read only) - not available
26	paddle y value (read only) - not available
27	oscillator voice 3 (read only) - not available
28	envelope voice 3 (read only) - not available

### Envelopes [![sidadsr.gif](https://wiki.hexadust.net/uploads/images/gallery/2025-11/KBzCCgvq6NhBnvwF-sidadsr.gif)](https://wiki.hexadust.net/uploads/images/gallery/2025-11/KBzCCgvq6NhBnvwF-sidadsr.gif)

Value	Attack Rate	Decay/Release Rate
Decimal	(Time/Cycle)	(Time/Cycle)
0	2 mS	6 mS
1	8 mS	24 mS
2	16 mS	48 mS
3	24 mS	72 mS
4	38 mS	114 mS
5	56 mS	168 mS
6	68 mS	204 mS
7	80 mS	240 mS
8	100 mS	300 mS
9	250 mS	750 mS
10	500 mS	1.5 S
11	800 mS	2.4 S
12	1 S	3 S
13	3 S	9 S
14	5 S	15 S
15	8 S	24 S

### Frequency ``` \ Frequency table: : SID:NOTE:C4 4389 ; : SID:NOTE:C4# 4650 ; : SID:NOTE:D4 4927 ; : SID:NOTE:D4# 5220 ; : SID:NOTE:E4 5530 ; : SID:NOTE:F4 5859 ; : SID:NOTE:F4# 6207 ; : SID:NOTE:G4 6577 ; : SID:NOTE:G4# 6968 ; : SID:NOTE:A4 7382 ; : SID:NOTE:A4# 7821 ; : SID:NOTE:B4 8286 ; \ Octave shifts : SID:OCT:UP 2* ; : SID:OCT:DOWN 2/ ; ``` ## Using with RC2014 Mini II Picasso [![rc2014-sid-picasso.jpg](https://wiki.hexadust.net/uploads/images/gallery/2025-10/scaled-1680-/CtuuwXAQ5rxqZeN2-rc2014-sid-picasso.jpg)](https://wiki.hexadust.net/uploads/images/gallery/2025-10/CtuuwXAQ5rxqZeN2-rc2014-sid-picasso.jpg) ### Limitations - Interrupt timer won't work since first half of memory is ROM and can't install interrupt handler. This will work with CP/M cards where all memory space is backed by RAM. - It is not possible to read data from SID chip. Paddled and voice 3 data and ADSR registers cannot be read. ### Basic Set ROM address to `0 100` (just *Bank 2* set) to boot into *Microsoft BASIC (Phil Green)*. Insert SID interface card: marked `A15` pin is pin 1. Use the following test BASIC program (as provided in the instructions): ```vbscript 10 DATA 205,7,10,123,66,14,84,237,121 20 DATA 0,0,0,203,248,237,121,195,125,17 30 FOR A=-1024 TO -1006 40 READ D 50 POKE A,D 60 NEXT A 70 POKE -32695,0 80 POKE -32694,252 90 LET A=USR(1024) 100 LET A=USR(6159) 101 LET A=USR(1280) 102 LET A=USR(1776) 103 LET A=USR(1041) 110 FOR D=256 TO 511 120 LET A=USR(D) 130 NEXT D 140 GOTO 110 ``` Type `RUN` to start it. You should hear "siren" audio effect. ### CamelForth Set ROM address to `0 001` (just *Bank 8* set) to boot into *CamelForth (Justin Skists)*. Paste following Forth program. ``` \ PS2! c c p-addr -- Data byte (A), high address byte (B), port address (C) - OUT to port with A and B registers set : PC2! SWAP >< OR PC! ; \ SID! c c -- Data value, register (0-31); bits 5,6 are for interrupt settings; bit 7 (/CS) is handled : SID! 2DUP 128 OR 84 PC2! 2DUP 127 AND 84 PC2! 128 OR 84 PC2! ; : SIDRST 0 24 SID! 0 4 SID! ; : SIDTEST 15 24 SID! 10 0 DO 255 0 DO I 1 SID! LOOP LOOP 0 24 SID! ; SIDRST 15 24 SID! 0 5 SID! 240 6 SID! 17 4 SID! SIDTEST ``` Decimals used: - 84 = 0x52 - I/O port number - 24 = 0x18 register 0x18 (24), no interrupt - 128 - high bit set - 127 - all but high bit set See project page for CamelForth SID library: [sid.4th](https://gitea.hexadust.net/hxd/rc2014-sid/src/branch/main/sid.4th)