29 The file-name is followed by two ‘hexadecimal’ numbers which give the ‘block number’. Each program is recorded as a series of ‘blocks’. See chapter 10 for an explanation of hexadecimal numbers. The last number on the line gives the ‘length’ of the file. The action of cataloguing a tape also lets the computer verify the information recorded. If there are errors in any of the data on the tape it will print a message and continue. The ESCAPE key allows you to leave cassette operations whenever you like. If you leave from the middle of a LOAD operation you will probably get a Bad Program error. Type NEW to remove this.
More information about cassette formats, loading errors and files is given in Chapter 35.