Apple IIe - Page 190

190 Apple lie Users Handbook
Before discussing the individual commands , we will discuss
topics related to all of these commands . These topics include:
Filenames
Filenames
Drive
Number Specification
Slot
Number Specification
Volume Specification
In Apple's DOS, a file must be referenced using its filename.
DOS
filenames must adhere to certain rules. First of all, a
filename must be from 1to30 characters in length. Any characters
in excess of 30 will be dropped (or truncated) . The first character
of the filename must be a letter. Any keyboard character except
the comma can be used in a filename.
Control characters can be included in filenames, although they
will not be displayed in catalog listings as they are nonprinting
characters. For exampl e, the following filename:
TEXT1'
iindicates pressing the Control key
would be displayed as TEXT in the catalog listing. However , if an
attempt was made to load the file using the filename TEXT , DOS
would not be able to locate the file.
Using
control characters within filenames offers an effective
security measure, as others will not be able to identify the actual
filename .
Drive Specification
Generally, DOS commands allow the user to specify several
optional parameters including the diskette 's volume numqer,
the slot containing the disk controller, and the disk drive being
used .
'Each disk
controller can control two separate disk drives. If a disk