DBLSPACE.SYS

Detailed Command Description

DBLSPACE.SYS

Determines the final memory location of DBLSPACE.BIN.

DBLSPACE.BIN is the part of MS-DOS that provides access to your compressed

drives. When you start your computer, MS-DOS loads DBLSPACE.BIN along with

other operating system functions, before carrying out the commands in your

CONFIG.SYS and AUTOEXEC.BAT files. DBLSPACE.BIN always loads in conventional

memory because it loads before device drivers that provide access to upper

memory.

When you run DoubleSpace Setup, it adds a command for DBLSPACE.SYS to your

CONFIG.SYS file.

Syntax

DEVICE = [drive:][path]DBLSPACE.SYS /MOVE [/NOHMA]

DEVICEHIGH = [drive:][path]DBLSPACE.SYS /MOVE [/NOHMA]

Switches

/MOVE

Moves DBLSPACE.BIN to its final location in memory.

Initially, DBLSPACE.BIN loads at the top of conventional memory. After

MS-DOS finishes carrying out the commands in the CONFIG.SYS file, it

moves DBLSPACE.BIN to the bottom of conventional memory. When

DBLSPACE.SYS is loaded by using the DEVICE command, it moves

DBLSPACE.BIN from the top of conventional memory to the bottom. This can

be useful for avoiding conflicts with programs that are loaded from the

CONFIG.SYS file and require access to the top of conventional memory.

When DBLSPACE.SYS is loaded by using the DEVICEHIGH command,

DBLSPACE.BIN moves to upper memory, if available. Moving DBLSPACE.BIN to

upper memory makes more conventional memory available.

/NOHMA

Prevents DBLSPACE.SYS from moving a portion of DBLSPACE.BIN to the high

memory area (HMA).

If MS-DOS is loaded into the HMA, DBLSPACE.SYS moves a portion of

DBLSPACE.BIN to the HMA (if there is enough room in the HMA). Use this

switch if you do not want DBLSPACE.BIN to use the HMA.

Parameter

[drive:][path]

Specifies the location of the DBLSPACE.SYS file.

DBLSPACE.SYS -- Notes

DBLSPACE.SYS does not provide access to compressed drives

The DBLSPACE.SYS device driver does not provide access to compressed drives;

it simply moves DBLSPACE.BIN to its final location in memory. (DBLSPACE.BIN

is the part of MS-DOS that provides access to compressed drives; it loads

with other operating system functions, before MS-DOS carries out the

commands in your CONFIG.SYS file.)

If your compressed drive's host drive requires a device driver

A few disk drives require an installable device driver. If such a drive

contains compressed volume files (either you compressed that drive, or you

created new compressed drives on that drive), the command for the

DBLSPACE.SYS device driver must appear in the CONFIG.SYS file after the

command for your drive's device driver. Otherwise, DoubleSpace will not

mount any compressed volume files located on that drive when your computer

starts.

Avoiding conflicts with programs that require access to the top of

conventional memory

When you start your computer, MS-DOS loads DBLSPACE.BIN at the top of

conventional memory; after processing the CONFIG.SYS file, MS-DOS moves

DBLSPACE.BIN to the bottom of conventional memory.

However, a few programs that are loaded from the CONFIG.SYS file require

access to the top of conventional memory and do not work properly if

DBLSPACE.BIN is located there. To avoid such conflicts, DoubleSpace Setup

adds a command for DBLSPACE.SYS before any command that starts a program

that is known to require this area of memory. The DBLSPACE.SYS device driver

moves DBLSPACE.BIN from the top of conventional memory to another area of

memory (either to the bottom of conventional memory or to upper memory).

Depending on your configuration, your CONFIG.SYS file might contain more

than one command for DBLSPACE.SYS. This will not cause any problems.

Moving part of DBLSPACE.BIN to the high memory area

By default, if your CONFIG.SYS file contains a DOS=HIGH command,

DBLSPACE.SYS moves the compression server, a portion of DBLSPACE.BIN, to the

HMA. To move a portion of DBLSPACE.BIN to the HMA, you must have an 80286 or

higher computer with extended memory, and must be running HIMEM or another

extended-memory manager.

Moving DBLSPACE.BIN to upper memory

When loaded with a DEVICEHIGH command, the DBLSPACE.SYS device driver moves

DBLSPACE.BIN from conventional to upper memory. If there is no upper memory

block large enough to accommodate DBLSPACE.BIN, it is instead moved to the

bottom of conventional memory.

To use the upper memory area, you must have an 80386 or 80486 computer with

extended memory.

Using BUFFERS with DoubleSpace

If you are using DoubleSpace and SMARTDrive, and MS-DOS is loaded into the

HMA, set BUFFERS=10. This ensures that there will be enough room in the HMA

for MS-DOS, DoubleSpace, and all your buffers. (If BUFFERS is set to a value

higher than 10, there might not be enough room in the HMA for all your

buffers, and MS-DOS will place all the buffers into conventional memory.) If

you're using SMARTDrive, specifying more than 10 buffers will not speed up

your system much, but will use additional memory.

DBLSPACE.SYS -- Examples

To move a portion of DBLSPACE.BIN to the HMA and move the rest to the bottom

of conventional memory, you must have an 80286 or higher computer, and your

CONFIG.SYS file must contain a DOS=HIGH command and a `DEVICE command for

HIMEM or another extended-memory manager. Load DBLSPACE.SYS by using the

following command:

device=dblspace.sys /move

To move a portion of DBLSPACE.BIN to the HMA and the rest to the upper

memory area (if available), you must have an 80386 or higher computer with

extended memory. Ensure that your CONFIG.SYS file contains a DEVICE command

for DBLSPACE.SYS, and then run MemMaker.

To move all of DBLSPACE.BIN to the bottom of conventional memory, and to

prevent DBLSPACE.BIN from using the HMA or upper memory, load DBLSPACE.SYS

by using the following command:

device=dblspace.sys /move /nohma

To move all of DBLSPACE.BIN to upper memory (if available), and to prevent

DBLSPACE.BIN from using the HMA, load DBLSPACE.SYS by using the following

command:

devicehigh=dblspace.sys /move /nohma

Contact CustomCodeInc@yahoo.com with comments or questions regarding this site. 
© Copyright, Custom Code,Inc., All rights reserved.