CMD CSA-6460U2, -0648, -0649 Ultra IDE DOS Driver Installation Instructions
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README.DOS
CONTENTS
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I. DOS DRIVER USAGE
II. DOS DRIVER COMMAND LINE OPTIONS
I. DOS DRIVER USAGE
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1. Cmdatpcd.sys:
Installation with the CMDATPCD.SYS file is required when users want to use a
CDROM under DOS and 'command prompt only mode' under Windows
95/OSR2/98/Me. Cdrom driver from cdrom manufacturer will not work
with CSA-6460U2/648/649 controllers unless it is written to
support native mode (using different IRQ for IDE controller
besides IRQ14 and IRQ15) other than legacy mode.
Copy Cmdatpcd.sys into a directory where all the CMD drivers are
kept. For instance, if you copy file to directory QUICKCMD, the
following line needs to be manually added in config.sys.
device=c:\quickcmd\cmdatpcd.sys /d:cmd_cd
The following lines needs to be added in autoexec.bat:
path=c:\quickcmd;%PATH%
mscdex /d:cmd_cd
2. cmd64xx2.sys:
This driver is to be loaded only under DOS.
DO NOT load cmd64xx2.sys driver under Windows 95/OSR2/Windows 98
systems. Copy cmd64xx2.sys into a directory(for example, quickcmd).
In order to load cmd646x2.sys, add following line in config.sys
needs to be added manually.
Device=c:\quickcmd\cmd64xx2.sys
Read section II for the DOS DRIVER COMMAND LINE OPTIONS for advance
setting.
II. DOS DRIVER COMMAND LINE OPTIONS
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For default operation using PIO data transfers, no command line
options are necessary for the DOS driver. To enable DMA/Ultra DMA
transfers, use the option /E (Option /A must be used together
with option /E). The remaining options will be of interest only
to power users. To enable command line options, append them to the
DEVICE=c:\quickcmd\CMD646X2.SYS line in your CONFIG.SYS.
/A<lbs> : Enable Advanced Timing modes. When this option is
specified, the driver queries the drive(s) for supported
IDE timing modes. The driver then sets up both the drive(s)
and the CMD PCI IDE controller for the fastest supported
timing mode(s). <lbs> specfies the PCI bus
clock speed in MHz. Valid values are between 20 and 50.
WARNING: Disk access may be unreliable if the PCI bus speed
is incorrectly specified. If you are unsure of your PCI bus
speed, use <lbs>=50 until you determine the actual speed.
Follow the chart below for the PCI bus speed for each different CPU
speeds:
CPU speed ->Corresponding PCI bus speed
50MHz and 75MHz -> 25MHz
60MHz, 90MHz and
150MHz -> 30MHz
66MHz, 100MHz,
133MHz, 166MHz,
200MHz, 233MHz,
266MHz, and 300MHz -> 33MHz
/D : To display detailed information.
/E : Enable DMA/Ultra. Drives which support DMA/Ultra will use
DMA/Ultra data transfer; drives which only support PIO will use
PIO transfer. This switch must be used together with switch
/a<lbs> in order to run DMA/Ultra mode properly.
/O may be used to override a specific drive.
/O<drive number><transfer mode><mode number> :
Override transfer mode.
Some drives have firmware bugs which cause them to report
incorrect transfer mode information to the driver. For
instance, many DMA Mode 2 drives are really Mode 0, and some
DMA drives can't really support DMA reliably. By default,
the driver automatically selects the fastest mode which a
drive claims to support. The user can override this mode by
using /O. /O overrides /E on a per-drive basis.
WARNING: The driver does no sanity checking on drives for which
/O is specified. Using /O to set a drive to an unsupported
transfer mode may cause data corruption!
drive number : 0=primary master, 1=primary slave,
2=secondary master, and 3=secondary slave.
transfer mode: p=programmed I/O, m=multi-word DMA,
and u=ultra DMA
mode number : mode number:0-5 when type = P
0-2 when type = M
0-5 when type = U
/w<value>: programmable timeout value (ns) when chip doesn't detect CMD chip
and waiting for user to press any key. The value should be 1-9.
EXAMPLE:
device=c:\quickcmd\cmd646x2.sys /a33 /o1M0
EXPLANATION:
/a33 : enable optimal performance timings for a 33 MHz local bus.
/o1M0 : force the Primary IDE slave drive to use multi-word DMA
Mode 0
Download Driver Pack
After your driver has been downloaded, follow these simple steps to install it.
Expand the archive file (if the download file is in zip or rar format).
If the expanded file has an .exe extension, double click it and follow the installation instructions.
Otherwise, open Device Manager by right-clicking the Start menu and selecting Device Manager.
Find the device and model you want to update in the device list.
Double-click on it to open the Properties dialog box.
From the Properties dialog box, select the Driver tab.
Click the Update Driver button, then follow the instructions.
Very important: You must reboot your system to ensure that any driver updates have taken effect.
For more help, visit our Driver Support section for step-by-step videos on how to install drivers for every file type.