/~-"
VERSION 2.0 UPDATE
"Minimum
System"
This is a diskette which cannot be used to startTRSDOS, but may be used after the
systemis fully initialized. This diskette contains the minimum amount
of
system
files required for
TRSDOS operationafter initialization.
You may want to create a minimum system diskette for use in special applications
where space in drive 0 is at a premium. You may use
PURGE
or
XFERSYS to create a
minimum system.
Why and
How
of
MinimumSystem Diskettes
If
you
don't
have a Disk Expansion Unit, but still need extradisk space for storage
oflarge
data
or
program files, you may
~eed
to create minimum system diskettes
for use. This kind
of
diskette has the minimum operating system programs on it for
processing, but may not be used for resetting or starting up. These diskettes may
only be used in drive 0 afteryou have reset or started using a full system diskette.
The minimum system diskette will contain the following system programs:
SYSTEM/SYS
SYSTEMnn
(nn
= 32 for 32K machines, 64 for 64K machines)
Note:
If
you do not plan to use
DO,
HOST, SPOOL, DEBUG, or serial I/O during the
execution
of
yourapplication, you will not need SYSTEM 64 or SYSTEM 32 on your
minimum system diskette.
The technique for using a minimum system diskette
is
as follows:
1.
Initialize using your working master (which must be a full system diskette).
2. Remove this diskette from drive 0 and replace with the minimum system
diskette that you have created.
3. Now you may start running yourapplication which should be on the minimum
system diskette.
If
your application requires more than one diskette for the storage
of
files or
programs, then each diskette used (with your one-drive system) should be a
minimum system. Yourapplication should be written such thatyou only have files
open on the diskette that is currently in drive 0, and that when you need to swap
diskettes to get data (orprograms) from another minimumsystem diskette, that you
close the open files, then do the swap, then open the file(s) that you need from the
otherdiskette.
You may also use minimum system diskettes in a multi-drive setup, but keep in
mind that you must start
or
reset with a full system diskette in all cases.
To Create a MinimumSystem Diskette
There are two ways to create a minimum system disk. The first
is
to start with a
copy
of
eitheryour working master or any other full system disk and, from this,
purge
off
all
of
the modules except SYSTEM/SYS and SYSTEM64 (or SYSTEM32). The
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