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1 /*
2 * opl3.h - Definitions of the OPL-3 registers
3 *
4 * Copyright by Hannu Savolainen 1993
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 *
27 */
28
29 /*
30 * The OPL-3 mode is switched on by writing 0x01, to the offset 5
31 * of the right side.
32 *
33 * Another special register at the right side is at offset 4. It contains
34 * a bit mask defining which voices are used as 4 OP voices.
35 *
36 * The percussive mode is implemented in the left side only.
37 *
38 * With the above exceptions the both sides can be operated independently.
39 *
40 * A 4 OP voice can be created by setting the corresponding
41 * bit at offset 4 of the right side.
42 *
43 * For example setting the rightmost bit (0x01) changes the
44 * first voice on the right side to the 4 OP mode. The fourth
45 * voice is made inaccessible.
46 *
47 * If a voice is set to the 2 OP mode, it works like 2 OP modes
48 * of the original YM3812 (AdLib). In addition the voice can
49 * be connected the left, right or both stereo channels. It can
50 * even be left unconnected. This works with 4 OP voices also.
51 *
52 * The stereo connection bits are located in the FEEDBACK_CONNECTION
53 * register of the voice (0xC0-0xC8). In 4 OP voices these bits are
54 * in the second half of the voice.
55 */
56
57 /*
58 * Register numbers for the global registers
59 */
60
61 #define TEST_REGISTER 0x01
62 #define ENABLE_WAVE_SELECT 0x20
63
64 #define TIMER1_REGISTER 0x02
65 #define TIMER2_REGISTER 0x03
66 #define TIMER_CONTROL_REGISTER 0x04 /* Left side */
67 #define IRQ_RESET 0x80
68 #define TIMER1_MASK 0x40
69 #define TIMER2_MASK 0x20
70 #define TIMER1_START 0x01
71 #define TIMER2_START 0x02
72
73 #define CONNECTION_SELECT_REGISTER 0x04 /* Right side */
74 #define RIGHT_4OP_0 0x01
75 #define RIGHT_4OP_1 0x02
76 #define RIGHT_4OP_2 0x04
77 #define LEFT_4OP_0 0x08
78 #define LEFT_4OP_1 0x10
79 #define LEFT_4OP_2 0x20
80
81 #define OPL3_MODE_REGISTER 0x05 /* Right side */
82 #define OPL3_ENABLE 0x01
83
84 #define KBD_SPLIT_REGISTER 0x08 /* Left side */
85 #define COMPOSITE_SINE_WAVE_MODE 0x80 /* Don't use with OPL-3? */
86 #define KEYBOARD_SPLIT 0x40
87
88 #define PERCUSSION_REGISTER 0xbd /* Left side only */
89 #define TREMOLO_DEPTH 0x80
90 #define VIBRATO_DEPTH 0x40
91 #define PERCUSSION_ENABLE 0x20
92 #define BASSDRUM_ON 0x10
93 #define SNAREDRUM_ON 0x08
94 #define TOMTOM_ON 0x04
95 #define CYMBAL_ON 0x02
96 #define HIHAT_ON 0x01
97
98 /*
99 * Offsets to the register banks for operators. To get the
100 * register number just add the operator offset to the bank offset
101 *
102 * AM/VIB/EG/KSR/Multiple (0x20 to 0x35)
103 */
104 #define AM_VIB 0x20
105 #define TREMOLO_ON 0x80
106 #define VIBRATO_ON 0x40
107 #define SUSTAIN_ON 0x20
108 #define KSR 0x10 /* Key scaling rate */
109 #define MULTIPLE_MASK 0x0f /* Frequency multiplier */
110
111 /*
112 * KSL/Total level (0x40 to 0x55)
113 */
114 #define KSL_LEVEL 0x40
115 #define KSL_MASK 0xc0 /* Envelope scaling bits */
116 #define TOTAL_LEVEL_MASK 0x3f /* Strength (volume) of OP */
117
118 /*
119 * Attack / Decay rate (0x60 to 0x75)
120 */
121 #define ATTACK_DECAY 0x60
122 #define ATTACK_MASK 0xf0
123 #define DECAY_MASK 0x0f
124
125 /*
126 * Sustain level / Release rate (0x80 to 0x95)
127 */
128 #define SUSTAIN_RELEASE 0x80
129 #define SUSTAIN_MASK 0xf0
130 #define RELEASE_MASK 0x0f
131
132 /*
133 * Wave select (0xE0 to 0xF5)
134 */
135 #define WAVE_SELECT 0xe0
136
137 /*
138 * Offsets to the register banks for voices. Just add to the
139 * voice number to get the register number.
140 *
141 * F-Number low bits (0xA0 to 0xA8).
142 */
143 #define FNUM_LOW 0xa0
144
145 /*
146 * F-number high bits / Key on / Block (octave) (0xB0 to 0xB8)
147 */
148 #define KEYON_BLOCK 0xb0
149 #define KEYON_BIT 0x20
150 #define BLOCKNUM_MASK 0x1c
151 #define FNUM_HIGH_MASK 0x03
152
153 /*
154 * Feedback / Connection (0xc0 to 0xc8)
155 *
156 * These registers have two new bits when the OPL-3 mode
157 * is selected. These bits controls connecting the voice
158 * to the stereo channels. For 4 OP voices this bit is
159 * defined in the second half of the voice (add 3 to the
160 * register offset).
161 *
162 * For 4 OP voices the connection bit is used in the
163 * both halfs (gives 4 ways to connect the operators).
164 */
165 #define FEEDBACK_CONNECTION 0xc0
166 #define FEEDBACK_MASK 0x0e /* Valid just for 1st OP of a voice */
167 #define CONNECTION_BIT 0x01
168 /*
169 * In the 4 OP mode there is four possible configurations how the
170 * operators can be connected together (in 2 OP modes there is just
171 * AM or FM). The 4 OP connection mode is defined by the rightmost
172 * bit of the FEEDBACK_CONNECTION (0xC0-0xC8) on the both halfs.
173 *
174 * First half Second half Mode
175 *
176 * +---+
177 * v |
178 * 0 0 >+-1-+--2--3--4-->
179 *
180 *
181 *
182 * +---+
183 * | |
184 * 0 1 >+-1-+--2-+
185 * |->
186 * >--3----4-+
187 *
188 * +---+
189 * | |
190 * 1 0 >+-1-+-----+
191 * |->
192 * >--2--3--4-+
193 *
194 * +---+
195 * | |
196 * 1 1 >+-1-+--+
197 * |
198 * >--2--3-+->
199 * |
200 * >--4----+
201 */
202 #define STEREO_BITS 0x30 /* OPL-3 only */
203 #define VOICE_TO_LEFT 0x10
204 #define VOICE_TO_RIGHT 0x20
205
206 /*
207 * Definition table for the physical voices
208 */
209
210 struct physical_voice_info {
211 unsigned char voice_num;
212 unsigned char voice_mode; /* 0=unavailable, 2=2 OP, 4=4 OP */
213 unsigned short ioaddr; /* I/O port (left or right side) */
214 unsigned char op[4]; /* Operator offsets */
215 };
216
217 /*
218 * There is 18 possible 2 OP voices
219 * (9 in the left and 9 in the right).
220 * The first OP is the modulator and 2nd is the carrier.
221 *
222 * The first three voices in the both sides may be connected
223 * with another voice to a 4 OP voice. For example voice 0
224 * can be connected with voice 3. The operators of voice 3 are
225 * used as operators 3 and 4 of the new 4 OP voice.
226 * In this case the 2 OP voice number 0 is the 'first half' and
227 * voice 3 is the second.
228 */
229
230 #define USE_LEFT 0
231 #define USE_RIGHT 1
232
233 static struct physical_voice_info physical_voices[18] =
234 {
235 /* No Mode Side OP1 OP2 OP3 OP4 */
236 /* --------------------------------------------------- */
237 { 0, 2, USE_LEFT, {0x00, 0x03, 0x08, 0x0b}},
238 { 1, 2, USE_LEFT, {0x01, 0x04, 0x09, 0x0c}},
239 { 2, 2, USE_LEFT, {0x02, 0x05, 0x0a, 0x0d}},
240
241 { 3, 2, USE_LEFT, {0x08, 0x0b, 0x00, 0x00}},
242 { 4, 2, USE_LEFT, {0x09, 0x0c, 0x00, 0x00}},
243 { 5, 2, USE_LEFT, {0x0a, 0x0d, 0x00, 0x00}},
244
245 { 6, 2, USE_LEFT, {0x10, 0x13, 0x00, 0x00}}, /* Used by percussive voices */
246 { 7, 2, USE_LEFT, {0x11, 0x14, 0x00, 0x00}}, /* if the percussive mode */
247 { 8, 2, USE_LEFT, {0x12, 0x15, 0x00, 0x00}}, /* is selected */
248
249 { 0, 2, USE_RIGHT, {0x00, 0x03, 0x08, 0x0b}},
250 { 1, 2, USE_RIGHT, {0x01, 0x04, 0x09, 0x0c}},
251 { 2, 2, USE_RIGHT, {0x02, 0x05, 0x0a, 0x0d}},
252
253 { 3, 2, USE_RIGHT, {0x08, 0x0b, 0x00, 0x00}},
254 { 4, 2, USE_RIGHT, {0x09, 0x0c, 0x00, 0x00}},
255 { 5, 2, USE_RIGHT, {0x0a, 0x0d, 0x00, 0x00}},
256
257 { 6, 2, USE_RIGHT, {0x10, 0x13, 0x00, 0x00}},
258 { 7, 2, USE_RIGHT, {0x11, 0x14, 0x00, 0x00}},
259 { 8, 2, USE_RIGHT, {0x12, 0x15, 0x00, 0x00}}
260 };
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*/