Radio Shack TRS-80 Model II Reference Manual page 4

VERSION 2.0 UPDATE
2. Duplicate the
TRSDOS 2.0
Diskette
(BACKUP)
Use your factory-release TRSDOS diskette for one purpose only - as an "original
master" . It should not be used for applications, only for creating a" working
master". You can then make changes to the working master to suit various
applications.
As an added precaution, keep the factory-release diskette write-protected.
Note: In the BACKUP dialog, the term" source diskette" refers to the diskette to be
duplicated; "destination diskette" refers to the diskette to contain the copy of the
original.
UnderTRSDOS READY, type in the appropriate BACKUP command. We suggest the
following:
BACKUP
0
TO destination
where destination is the drive containing the formatted diskette which will become
a TRSDOS diskette.
If destination
=
0, TRSDOS will prompt you when to swap source and destination
diskettes.
When the backup process is complete, remove the original diskette. Keep it in a
safe place and don't use it unless you need to recreate the working master.
3. Make a Working Master
(PURGE)
The factory-release TRSDOS diskette contains a variety of non-essential files. These
non-essential files serve various purposes, including:
• Demonstration of programming techniques
• Modification of system input/output software
• Special features and functions
Now that your original TRSDOS diskette is safely set aside, you should create one or
more customized system diskettes to suit your needs. For a discussion of' 'full
system", "minimum system" , and' 'data" diskettes, see Disk File
Requirements later in this section.
Determine what files you will need for day-to-day use. You may want to have
several different system diskettes - each with a different collection of system files.
If there are some files you don't want on any of your working diskettes, you may
delete them from the working master. If there are files you don't want in a particular
application, delete them from that diskette only.
To delete files, use the PURGE command.
37