Changes
| 17 || Last block || Tape only, set to 0
|-
| 18 || File type || 0Bit0 =Protection (set if protected) ; Bits1..3 = File contents (0:BASIC, 1=:Binary, 2=:Screen image, 3=:ASCII, 4..7 are unallocated) ; Bits4..7 = Version
|-
| 19..20 || Data length || The number of data bytes in the data record. As per cassette
