#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?? */