CDStatusData
From Yabause
CD Status Data
| CR1 | CD status(high byte), flag and repeat count(low byte) |
| CR2 | Ctrl addr(high byte), track number(low byte) |
| CR3 | Index number(high byte), upper byte of FAD(low byte) |
| CR4 | Lower word of FAD(word) |
CD Status flags are as follows:
| 0x00 | Busy |
| 0x01 | Paused |
| 0x02 | Standby/Stopped |
| 0x03 | Playing Audio/Reading Data Sectors |
| 0x04 | Seeking Position |
| 0x05 | Scanning Disc |
| 0x06 | Tray Open |
| 0x07 | No Disc |
| 0x08 | Retrying Read |
| 0x09 | Error reading data |
| 0x0A | Fatal Error |
| 0x20 | Periodic Response(this is done 75 times a second when playing at 1x, 150 times a second at 2x, and 60 times a second when nothing is playing) |
| 0x40 | Data Transfer Request |
| 0x80 | Waiting |
| 0xFF | Rejected command |
Notes: Only one flag in the ranges of 0x00-0x0A and 0xFF can be set at once, the rest of the flags can potentially be set at the same time(For example if the drive is reading data and a periodic response happens, status is set to 0x23).
