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README.VDI
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1994-09-01
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118 lines
***********************************************************************
IMPORTANT INFORMATION
for
mach32 Users
***********************************************************************
RELEASE NOTES FOR VDIF.EXE September 1, 1994
***********************************************************************
READ THIS FILE COMPLETELY BEFORE ATTEMPTING TO USE THIS PRODUCT !
****************************
Contents
1.0 Introduction
2.0 Requirements
3.0 Running the Program
4.0 .VDA and .VDB Files
5.0 Approximation Errors
*****************************
1.0 Introduction
VDIF.EXE is designed according to the VESA Display Information Format
(VDIF) standard 1.0. It allows a monitor to be added directly to the
monitor list of the install program for the mach32 using a .vda or .vdb
file. The .vda or .vdb file lists data for each of the available vertical
scan frequencies of a given monitor for the following four display modes:
640x480
800x600
1024x768
1280x1024
VDIF.EXE will search through the .vda or .vdb file and select the "best"
data for each of the four modes listed above. The best data is
defined as the data best matching the mach32 timings parameters, and having
the highest vertical scan frequency, with non-interlaced displays chosen
before interlaced displays. If no data is found for a mode, then that mode
is considered to be unsupported.
To use VDIF.EXE, simply include the name of the .vda or .vdb file
(including the extension) on the command line. The program will display
the modes that it selects and modify the "MONITOR.DAT" file. The original
MONITOR.DAT file is simply renamed MONITOR.BAK, in case it needs to be
restored. Please refer to the example in Section 3.0 below.
Only one monitor can be added to the monitor.dat from a VDIF file at a
time. To replace one VDIF monitor with another, simply run the vdif.exe
utility again with the name of the VDIF file describing the new monitor.
If you do come across any problems, please report them as soon as
possible by fax or CompuServe to ATI, using the attached form.
*****************************
2.0 Requirements
- Graphics Card: All mach32 based graphics accelerators.
3.0 Running the Program
To add a monitor to your MONITOR.DAT file, copy the .vda or .vdb file to
the directory containing the mach32 install program and run the following:
VDIF [filename.VDA]
or VDIF filename.VDB
where filename is the name of the .VDB or .VDA file supplied by your
monitor manufacturer. If filename is not specified, VDIF will prompt
for a filename.
NOTE: VDIF modifies the MONITOR.DAT file residing in the mach32 install
directory. The old MONITOR.DAT file will be placed in a new file
called MONITOR.BAK
*****************************
4.0 .VDA and .VDB Files
The .vda and .vdb files mentioned above contain critical information which
the mach32 card requires to properly control a particular monitor. The
ascii text format (.vda) and the binary format (.vdb) contain the same
information in different forms. Both formats are translated by the VDIF
utility into a file which is readable by the mach32 installation utility.
The installation diskette includes some sample .vda files. Please make
sure your monitor is compatible with the data in the sample .vda files
before using it. Improper use of an inappropriate .vda file may cause
permanent damage to your monitor. Specific .vda and .vdb files are
provided by monitor manufacturers. Please note that .vda and .vdb files
are provided by your monitor manufacturer and they may not be available
for all makes and models.
If you do not have a .vda or a .vdb
file for your monitor, please contact your monitor manufacturer
immediately.
Please note that the three .vda files included (NEC_3FGE.VDA, NEC_4FGE.VDA,
and NEC_5FGE.VDA) do not include data for resolutions of 1280x1024 pixels
because the monitors are physically incapable of supporting that resolution.
*****************************
5.0 Approximation Errors
VDIF.EXE sometimes must approximate monitor information for the mach32
install. An error in approximation may degrade video performance.
For this reason, VDIF will issue a warning if an error in
approximation occurs.
If the .vda or .vdb file passed to VDIF on the command line is not of the
standard format, or if it does not contain enough information, VDIF will
not be able to find mode information, and no modes will be supported.