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  Description:  Random Read
 
  Reads a selected record from a file into memory.
 
  Input                           Output
  ════════════════════            ════════════════════════════════════════
  AH=21H                          AL=00H  if read successful
  DS:DX=segment:offset               01H  if end of file
        of previously                02H  if segment wrap, read canceled
        opened file                  03H  if partial record read at end
        control block                      of file
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