=> R0 = &40
R1 = pointer to subchannel block
R7 = pointer to CDFS control block
<= All registers preserved
CD_ReadSubChannel block
Offset Contents
0 LBA address of current head position relative to track start
4 Absolute LBA address
8 Audio flags:
bit 0: 0=audio, 1=data
bit 1: 0=4 channel, 1=2 channel
9 Track number
10 Index number
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