buffertype= array[0..buffersize] of byte;
   bufferptr = ^buffertype;
   anystring = string[255];
   nstring = string[64]; { suitable for DOS,CP/M names }
   paramptr = ^params;
   params = record     { disk parameter block }
                       { don't change for 512 byte disks }
              dmode1 : byte;
              dmode2 : byte;
              clocktick : byte;
              bytesector : byte; { 0..3 128..512 }
              lastsector : byte;
              gaplen : byte;
              datalen : byte;
              gaplenformat : byte;
              formatchar : byte;
              headsettle : byte;
              motorstart : byte;
            end;