Hello,

Yes, more legacy thing, sorry.

Reviewing some old CD Audio recognition code under the light of the ‘retirement’ of the READ SUB CHANNEL command, my team noticed some code using the said command as part of a recognition mechanism. As far as I understand this should be replace by a READ TOC command which returns the same CONTROL bits. However the CONTROL bits meaning formerly in MMC 4’s Table 429 – Q Sub-channel control field, has been removed from MMC 5 section 6 as READ SUB CHANNEL command moved to Annex E.

Could the said table be put instead under “6.26.3.2.2 General Case for CD” after “The CONTROL Field indicates the attributes of the track.”?

Best regards,

David Burg

Research Software Engineering Lead

Tel.: +1 425 707 8769