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-
- This final release of the Windows 95 device driver can control the
- Philips CM-205MS, and CM-206 CDROM drives. To install the driver,
- use the following procedure:
-
- 1) Make backup copies of all the following files: CONFIG.SYS, AUTOEXEC.BAT files.
- SYSTEM.DAT and USER.DAT. ***NOTE*** SYSTEM.DAT and USER.DAT are
- hidden, system, read-only files and are located in the C:\WINDOWS
- directory. These two files comprise the REGISTRY for your system.
- If they get damaged or corrupted in any way, your system will not
- start and you'll probably have to re-install Windows95. Exercise
- EXTREME caution when working with these files. For more information
- on the REGISTRY, see the Win95 help utility.
-
- 2) Remove the DOS driver line (DD250MS.SYS or DD260.SYS) from your active
- CONFIG.SYS file and remove the MSCDEX line from your active
- AUTOEXEC.BAT file.
-
- 3) From the Windows 95 Control Panel:
- * Select the 'Add New Hardware' option.
- * You DO NOT want Windows to auto detect the hardware.
- * Add a new CDROM controller.
- * With the setup diskette in drive A, select the HAVE DISK option.
- * Complete the installation by following the on screen instructions.
-
- 4) You must re-boot the system after installing the driver.
-
- _______________________________________________________________________________
-
- Setting Interrupt Jumpers:
-
- The driver will utilize a 'Polling' method unless directed to use
- Interrupts by the Registry Entry for the device. Polling is fine
- for casual usage. However, to properly run applications which are
- CDROM intensive, interrupts should be used. Use the following
- procedure to enable interrupts for the CDROM device(s):
-
- 1) Set the interrupt jumper on the CM-260 host adapter card to the desired
- level. The IRQ you select should not conflict with any other device
- in your system. If you are upgrading from Windows 3.1(1) you will
- not not need to change this setting unless you have added new
- hardware.
-
- 2) From a Windows 95 MS-DOS prompt, run the Registry Editor (REGEDIT) and
- modify the Registry Entry under the Philips CDROM device as follows:
-
- HKEY_LOCAL_MACHINE\SYSTEM\CURRENT_CONTROL_SET\SERVICES\CLASS\ADAPTER
- \0000\AdapterSettings
-
- 3) Edit the AdapterSettings String using the following syntax:
- IRQx=y where x is the device number 0, 1, or 2 and y is the
- IRQ setting on the adapter card. If you are installing only one
- Philips CDROM drive, use device number 0.
-
- The Registry tree entry will look something like this for a
- single host adapter set to IRQ 15:
-
- HKEY_LOCAL_MACHINE\SYSTEM\CURRENT_CONTROL_SET\SERVICES\CLASS\ADAPTER
- \0000\AdapterSettings:IRQ0=15
-
- 4) Windows 95 has a performance option that can be set from the Control
- Panel 'System' icon. This option allows you to optimize CDROM
- access for a dual speed (2X) drive such as the CM206.
-
- 5) The system will need to be rebooted for the changes to take effect.
-
-
-
- Known Issues;
-
- 1). Autoplay is not supported for audio CD's.
-
- 2). The CM-205MS and CM-206 CDROM drives were designed to be
- used in the MS-DOS and Windows 3.x environments. Several unique
- features were incorporated into the design of these drives to
- enhance performance. While these design features have proven
- very effective in real mode environments, they are not entirely
- compatible with protected mode operating systems like Windows 95.
- Regardless of the operating system, CDROM transfer rate is heavily
- dependant of data buffering. In real mode (DOS, Windows 3.x)
- buffering was the responsibility of the device driver and our
- prodcuts were designed to take advantage of this. In the Windows 95
- environment, the operating system has complete control over
- system resources and allocates a percentage of them to peripherals
- as it sees fit. This method of peripheral control is in direct
- conflict with the design of the CM-206 drive. If the percentage
- allocated to the CDROM drive is too low, the result is poor
- transfer rate performance. The following parameters can affect
- the ammount of available system resources;
-
- 1). Processor speed.
- 2). System RAM.
- 3). Cache size (both processor and peripheral).
- 4). Running multiple applications simultaneously.
- 5). Running hardware intensive applications (.AVI or .MPG files, etc.).
-
- Our tests show that, in order to achieve marginally acceptable CDROM
- performance, a 486 DX-80 processor is the minimum required.
- Additionally, applications using full motion video require a minimum
- of 8 megs of RAM and a 32-bit video card and the ammount of RAM
- required will increase drastically if other applications are run
- simulateously.
-
- If the transfer rate of your CM-205MS or CM-206 CDROM drive is
- unacceptably slow, try increasing the ammount of available system
- resources as described above, or use the DOS drivers in real mode.
- The real mode drivers are not subject to control by the Windows 95
- operating system and are able to run much more efficiently.
-
-