#define IDX_IO_REC_DMA_CURROFS 0x34 /* PU:0x00000000 */
#define IDX_IO_REC_SOUNDFORMAT 0x36 /* PU:0x0000 */
-/** hmm, what is this I/O area for? MPU401?? (after playback, recording, ???, timer) **/
+/** hmm, what is this I/O area for? MPU401?? or external DAC via I2S?? (after playback, recording, ???, timer) **/
#define IDX_IO_SOMETHING_FLAGS 0x40 /* gets set to 0x34 just like port 0x0 and 0x20 on card init, PU:0x0000 */
/* general */
#define IDX_IO_42H 0x42 /* PU:0x0001 */
#define IRQ_RECORDING 0x0002
#define IRQ_MPU401 0x0010
#define IRQ_TIMER 0x0020 /* DirectX timer */
- #define IRQ_UNKNOWN1 0x0040 /* probably unused */
- #define IRQ_UNKNOWN2 0x0080 /* probably unused */
+ #define IRQ_UNKNOWN1 0x0040 /* probably unused, or possibly I2S port? or gameport IRQ? */
+ #define IRQ_UNKNOWN2 0x0080 /* probably unused, or possibly I2S port? or gameport IRQ? */
#define IDX_IO_66H 0x66 /* writing 0xffff returns 0x0000 */
#define IDX_IO_SOME_VALUE 0x68 /* this is set to e.g. 0x3ff or 0x300, and writable; maybe some buffer limit, but I couldn't find out more, PU:0x00ff */
#define IDX_IO_6AH 0x6A /* this WORD can be set to have bits 0x0028 activated (FIXME: correct??); actually inhibits PCM playback!!! maybe power management?? */
#define IDX_MIXER_ADVCTL1 0x1e
/* unlisted bits are unmodifiable */
#define MIXER_ADVCTL1_3DWIDTH_MASK 0x000e
- #define MIXER_ADVCTL1_HIFI3D_MASK 0x0300
-#define IDX_MIXER_ADVCTL2 0x20 /* resembles AC97_GENERAL_PURPOSE reg! */
+ #define MIXER_ADVCTL1_HIFI3D_MASK 0x0300 /* yup, this is missing the high bit that official AC97 contains, plus it doesn't have linear bit value range behaviour but instead acts weirdly (possibly we're dealing with two *different* 3D settings here??) */
+#define IDX_MIXER_ADVCTL2 0x20 /* subset of AC97_GENERAL_PURPOSE reg! */
/* unlisted bits are unmodifiable */
- #define MIXER_ADVCTL2_BIT7 0x0080 /* WaveOut 3D Bypass? mutes WaveOut at LineOut */
- #define MIXER_ADVCTL2_BIT8 0x0100 /* is this Modem Out Select? */
- #define MIXER_ADVCTL2_BIT9 0x0200 /* Mono Select Source? */
- #define MIXER_ADVCTL2_BIT13 0x2000 /* 3D enable? */
- #define MIXER_ADVCTL2_BIT15 0x8000 /* unknown */
+ #define MIXER_ADVCTL2_LPBK 0x0080 /* Loopback mode -- Win driver: "WaveOut3DBypass"? mutes WaveOut at LineOut */
+ #define MIXER_ADVCTL2_MS 0x0100 /* Mic Select 0=Mic1, 1=Mic2 -- Win driver: "ModemOutSelect"?? */
+ #define MIXER_ADVCTL2_MIX 0x0200 /* Mono output select 0=Mix, 1=Mic; Win driver: "MonoSelectSource"?? */
+ #define MIXER_ADVCTL2_3D 0x2000 /* 3D Enhancement 1=on */
+ #define MIXER_ADVCTL2_POP 0x8000 /* Pcm Out Path, 0=pre 3D, 1=post 3D */
#define IDX_MIXER_SOMETHING30H 0x30 /* used, but unknown??? */