=> R0 = addressing mode for returned size in
R1 = pointer to 8-byte block
R7 = pointer to CDFS control block
<= R0 preserved
R1 corrupted
R7 preserved
Returns size of CD currently in drive in block pointed to by R1.
CD_DiscUsed block
For mode 0:
Offset Contents
0 Size of CD measured in blocks
4 Size of a block on this CD
For mode 1:
Offset Contents
0 Number of frames
1 Number of seconds
2 Number of minutes
3 0
4 sector size (always 2048, even for audio discs)
Note: (min*60+sec)*75+frames = readable + 151
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