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Annotation of researchv10dc/dist/man/v3/man4/rf.4, revision 1.1.1.1

1.1       root        1: .pa 1
                      2: .he 'RF (IV)'3/15/72'RF (IV)'
                      3: .ti 0
                      4: NAME           rf  --  RF11-RS11 fixed-head disk file
                      5: .sp
                      6: .ti 0
                      7: DESCRIPTION    This file refers to the
                      8: concatenation of both RS-11 disks.
                      9: It may be either read or written, although writing is inherently
                     10: very dangerous, since
                     11: a file system resides there.
                     12: 
                     13: The disk contains 2048 256-word blocks,
                     14: numbered 0 to 2047.
                     15: Like the other block-structured devices (TC, RK)
                     16: this file is addressed in blocks, not bytes.
                     17: This has two consequences:
                     18: seek____ calls refer to block numbers, not byte numbers;
                     19: and sequential reading or writing always advance the read
                     20: or write pointer by at least one block.
                     21: Thus successive reads of 10 characters from this file
                     22: actually read the first 10 characters from successive
                     23: blocks.
                     24: .sp
                     25: .ti 0
                     26: FILES          /dev/rf0
                     27: .sp
                     28: .ti 0
                     29: SEE ALSO       tc(IV), rk(IV)
                     30: .sp
                     31: .ti 0
                     32: BUGS           The fact that this device
                     33: is addressed in terms of blocks, not bytes, is extremely
                     34: unfortunate.  It is due entirely to the fact that
                     35: read and write pointers (and consequently the arguments
                     36: to seek____) are single-precision
                     37: numbers.

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