=> R0 = bits 24-25 = 0 => no data transfer
= 1 => read
= 2 => write
= 3 reserved
R1 = length of control block
R2 -> control block
R3 -> buffer for data transfer
R4 = length of transfer
R5 = timeout in cs (0 = default)
R7 -> CDFS control block
<= R3,R4 = updated
R5-R9 = preserved
NZC = corrupted
If V set R0-R2 are as for SWI SCSI_Op
or R0 -> error not in SCSI range and R1,R2 corrupt
else R0-R2 = preserved
CD_SCSIUserOp must not be called in the background (for compatibility with
ATAPI drives).
Available from RISC OS 5.00 and later.
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