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=>     R1 =     reasons and flags
             0     Verify
             1     Read sectors
             2     Write sectors
             3     Read track/Id
             4     Write/format track
             5     Seek
             6     Restore
             7     Step in
             8     Step out
             9     Read sectors via cache
             15     Specify ?

<=     R0 =     0 if no error, error number and VS otherwise
     N, Z and C preserved

This SWI performs various low-level accesses on a disc.

See PRM 2, page 221.

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