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README.TXT
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1993-10-07
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BackMaster README File.
October 7, 1993.
This file contains information about specific problems you may
encounter or specific system configurations.
Adaptec controllers:
If you have an Adaptec Busmaster controller, the following
CONFIG.SYS setting is suggested:
BASEDEV=AHA154X.ADD /V /A:0 /BON:4 /A:0 /BOFF:12
/V displays messages during bootup. /A:0 specifies the
first of four possible adapters, and is necessary even if
only one adapter is installed. /BON:4 sets the bus on time
to 4 microseconds. /BOFF:12 sets the bus off time to 12
microseconds. Most of this information may be found in the
Command Reference under BASEDEV. The above BASEDEV setting
gives the floppy controller enough time on the bus to
transfer enough data (by DMA) to keep the tape moving.
Special thanks to Beta Tester Jay Vanderbilt for this
information.
Bus timing:
BackMaster may not work correctly if your system bus timing
is set higher than 8 MHZ. Tape drives are very sensitive to
hardware timing and an abnormal bus speed may result in
operational problems or errors reported by BackMaster.
FTDVR.SYS device driver conflicts:
The BackMaster device driver, FTDVR.SYS, has conflicts with
the Multimedia Presentation Manager (MMPM) drivers and some
cdrom device drivers. The driver conflicts may cause an
"Unable to open driver" error message or an OS/2 TRAP 000D.
To avoid the driver conflicts, make sure that FTDVR.SYS is
loaded in CONFIG.SYS after the cdrom drivers, but before the
MMPM drivers.
Note: We recommend locating FTDVR.SYS immediately
following the IFS= statement (if present) in
CONFIG.SYS. However, some drivers (such as cdrom
drivers) may have to be loaded before our driver. Some
experimentation on your part may be required to find
the optimal location for FTDVR.SYS.
The BackMaster installation program, BMINST, will place the
FTDVR.SYS in the correct location in CONFIG.SYS for most
machines. The driver conflicts are mentioned here for the
case of a manual installation or a driver conflict with
specific systems.
Low memory:
BackMaster may not work correctly on machines with less than
8 MB of memory. Machines with 8 MB of memory that have
network software loaded may also fall into this category.
In the case of a low memory machine, BackMaster will report
the error: "Unable to load device driver". Note: This
problem may be resolved in future versions of BackMaster or
OS/2.
Older tape drives (Hard Select):
The list of tape drives in the "Configuration Options"
dialog refer to Soft Select tape drives (most of the newer
tape drives are Soft Select), and will not correctly select
the older Hard Select type of tape drive. If you have a
Hard Select tape drive, select the "Generic QIC 40/80" tape
drive from the "Configuration Options" list. Refer to the
documentation that came with your tape drive to determine
which type of tape drive (Hard Select or Soft Select) you
have. In general, Hard Select drives may have jumpers to
select the drive (A or B) and will only function as the A or
B device, but not as a third floppy device.
PS/2 support:
IBM PS/2 systems are not currently supported under version
1.0 of BackMaster. PS/2 support will be added in the next
release of BackMaster.
Stacker:
If FTDVR.SYS resides on a stacked volume, the
DEVICE=FTDVR.SYS statement should be placed after the
stacker device drivers.
Time critical:
During normal tape drive operations, BackMaster must respond
to the tape drive signals within a certain amount of time,
or the tape drive may start to behave unpredictably, causing
BackMaster to abort the current tape operation. Active DOS
and Windows sessions may deny BackMaster the CPU time needed
to respond quickly to tape drive signals. If BackMaster
aborts in the middle of a tape operation, make sure that the
"Time Critical" check box in the "Configuration Options"
dialog is checked before retrying the tape operation. Time
critical will ensure that BackMaster is given enough CPU
time to respond quickly to the tape drive requests.
Version of OS/2:
BackMaster is designed for OS/2 versions 2.1 and above. It
may be used with OS/2 2.0, but unexpected crashes may occur,
especially during the file selection process. If you must
use BackMaster with OS/2 2.0, we suggest that you avoid
extensive opening and closing of directory folders during
the file selection process.
Write errors:
Write errors during a backup are fatal. If BackMaster
detects a write error, it will report the error and abort
the backup. It will be necessary to reformat the tape
before making further backups, since version 1.0 of
BackMaster will not update the bad sector map if bad sectors
are found during a backup. Future versions of BackMaster
will update the bad sector map during backup.