=> R0 = addressing mode
R1 = address in given mode
R7 = pointer to CDFS control block
<= R1 = returned 32-bit value of MSF address
This SWI converts a block address to MSF, in the form &00MMSSFF.
Note: Before use with PlayAudio should have a value added to it to allow for lead-in time of audio CDs. (e.g. 512=2 sec).
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