Changes
/* Catalog structure */
| 9-11 || Extension || Always in CAPS and maximum 3 characters long. Read Only flag on byte9 bit7. Hidden flag on byte10 bit7. Archive flag on byte11 bit7.
|-
| 12 || Current Extent || 0 is first extent. A file There can have be up to 4 entries 128K bytes (extent 0 to 38 logical extents)directly addressed by a single directory entry. So files cannot be larger than 64KB[http://www.cpm.z80.de/manuals/cpm22-m.pdf Source]
|-
| 13 || Reserved ||
