Apple IIe - Page 196

196 Apple lie Users Handbook
The one-letter code to the left of the listing identifies the file
type . An A indicates an Applesoft program file , while I identifies
an Integer BASIC program file . AT indicates a text file , and a B
identifies a
binary image file.
If a file is locked , its type code will be preceded by an asterisk(*).
If no asterisk appears, the file is unlocked. The concept of locked
and unlocked files will be discussed later in this chapter.
The
number of sectors occupied by the file is displayed as a
3-digit number to the right of the file type. For example , from
Illustration 5-14, HELLO occupies 6 sectors.
\The
minimum size of a diskette file is 1 sector. If a file exceeds 255
sectors, the sector catalogue listing number will be reset to zero
at
255 sectors. For example , a file with 287 sectors would be
displayed
as 032 in the catalog listing.
Track/Sector List
One item also contained in the directory entry for a file (but not
displayed by a CATALOG listing) is the location of the sector that
contains
that file 's track/sector list.
A track/ sector list consists of a list of the diskette locations used
by
the file. The contents of a track/ sector list are summarized in
Table
5-1 .
If the track/ sector list extends beyond 122 file sector identifiers,
the links will point to one or more subsequent sectors of the
track/ sector list. Otherwise , the links will be set to 0.