PC Engine CD+G has timeout issues when the disc is not actually playing #176
Description
On CD+G player (on System Card), CD+G will play correctly if you press PLAY immediately, but will highlight "DISC" (similarly to a read error) if the disc isn't played immediately.
This is because the subcode channel should be synthesized and data updated as part of every IRQ2 - whether the audio is playing, or if the CD head is seeking, or if the player is stopped. At the least, the subcode-Q data (including checksum) of the last-known sector should be repeated in the following cases:
- CD is not playing
- head seek is in progress (DO NOT sned updated subcode-Q information prior to the end of the SCSI command phase - which includes all of the seek time)
- After pressing "STOP"
- CD is paused