Laser Magnetic Storage International
4425 ArrowsWest Drive
Colorado Springs, CO. 80907
LZ250MS release 3.20 May 18, 1993
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Table of Contents
Section 1 List of Files
Section 2 New Features
Section 3 Buffers in host memory (the /M option)
Section 4 Details displayed with /V option (DD250MS and MSCDEX)
NOTE: THE DEVICE DRIVER ON THIS DISK WILL OPERATE PROPERLY ONLY WITH
CM205 DRIVES MANUFACTURED AFTER JUNE 1, 1993
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Section 1 - List of Files
The files included on this disc are:
READ.ME This text file.
DD250MS.SYS Device driver to support the CM205 and CM225 LMS CDROM
drives with the LMS CM250 host adapter. This device
driver adheres to the Microsoft specification for control
of optical drives using personal computers and the MS-DOS
operating system. It is compatible with Microsoft Windows
3.x. The driver requires an 80186 or higher host
processor.
MSCDEX.EXE The Microsoft CD ROM Extensions to MS-DOS, version 2.21.
SETUP.EXE A program to automatically install DD250MS.SYS and
MSCDEX.EXE.
USRGUIDE.TXT A text file with details on the installation process.
Files copied by Setup :
DD250MS.SYS
MSCDEX.EXE
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Section 2 - New Features
This release of the device driver software adds the following features to the
use of the CM205 or CM225 CD ROM drives:
- Access to multi-session Photo CD discs. Contact Eastman-Kodak
for more information on this subject.
- Automatic TOC cacheing
- Improved buffer management. For device driver revisions prior to
3.00, revision 3.10 delivers higher performance with 1/3 less buffer
space required from the PC memory.
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Section 3 - Buffers in host memory
The CM205 and CM225 CD ROM drives are compatible with the Multimedia PC
specification. One of the requirements stated in this document is the
capability to continuously stream data from the disc to the PC, while using
less than 40% of the processor's bandwidth. This capability allows the
execution of video or animation sequences on your Multimedia PC.
In order to meet the performance targets required for MPC compliance the CM205
and CM225 need to buffer data in the PC itself. When installing the device
driver software you have an option to select the number of memory buffers
available to the CD ROM device driver. This is the /M option on the DEVICE
line in the CONFIG.SYS file. The software installation program will put your
preference in the proper place and format. Each memory buffer requires 2,512
bytes of the memory in your PC.
Multimedia PC compliance does specify the use of at least a 386/25MHz
processor.
It is recommended to install at least 8 memory buffers to achieve MPC
compliance. You have the option to install a total of 32 buffer sectors.
Note that performance does not always improve as more memory is allocated for
the device driver. Typically the best performance is achieved with 24 memory
buffers installed. You may have to try more than one configuration to
determine the best one for your needs, given the trade-off between
performance and memory usage. If you do not plan to run Multimedia
applications, you may consider not installing any memory buffers for the CD
ROM device driver.
The minimum number of buffer sectors the driver will use is two. If you
specify 2 or less memory buffers, the driver will allocate 2, occupying 5024
bytes of PC memory.
The maximum number of memory buffers is 32. If you specify more than 32 on
the config.sys line, the driver will reduce it to 32. If memory constraints
disallow allocation of the entire number of memory buffers requested, then
the number will be reduced to available memory.
It is recommended that the DEVICEHIGH feature of MS-DOS 5.0 be used to load
the DD250MS driver and its memory buffers into upper memory. See your MS-DOS
manual for instructions on how to use this feature.
For example, if you accept the suggested options, your CONFIG.SYS file will
contain the line :
DEVICE=C:\CDROM\DD250MS.SYS /D:MSCD001 /P:340 /I:3 /M:8
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Section 4 - Details displayed with /V option
DD250MS driver
When loaded with this DEVICE statement :
DEVICE=C:\CDROM\DD250MS.SYS /V
The DD250MS driver displays something like :
LMS MSCDEX/MULTISESSION CDROM DEVICE DRIVER
VERSION 3.10 11:14:58 Apr 16 1993
CDROM DEVICE DRIVER NAME: MSCD001
Port base address: 0340
Interrupt request 0003
Memory buffers: 0002
MSCDEX
When loaded with this command line :
MSCDEX /L:W /D:MSCD001 /M:16 /V
MSCDEX displays something like :
MSCDEX Version 2.21
Copyright (C) Microsoft Corp. 1986, 1987, 1988, 1989, 1990, 1992. All rights
reserved.
Drive W: = Driver MSCD001 unit 0
485456 bytes free memory
0 bytes expanded memory
12956 bytes CODE
2112 bytes static DATA
33278 bytes dynamic DATA
48608 bytes used
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DD250MS.SYS, SETUP.EXE, READ.ME
(C) Copyright 1991,1992, 1993
Laser Magnetic Storage International
MSCDEX.EXE
(C) Copyright 1986,1987,1988,1989,1990,1992
Microsoft Corporation
Unauthorized Copying is Strictly Prohibited. All Rights Reserved
MS-DOS, Windows and MSCDEX are trademarks of Microsoft Corporation
