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1993-07-08
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MicroStation Driver
User's Manual
Table of Contents
Introduction 1
Key Features 1
System Requirements 1
Installation 2
Installation for MicroStation 2
Included Files 2
Technical Notes 3
Anti-Aliasing 3
The USCONFIG.EXE Program 3
The UCONFIG.DAT File 4
Becoming an Integral Part of MicroStation 4
Introduction
The MicroStation Driver is a protected-mode driver designed to
improve the user interface of MicroStation products by implementing the
full resolution of your graphics board and monitor and by providing
the means to customize some of the presentation parameters.
Key Features
The most important features to our MicroStation Driver users include:
* Full 32-bit performance for all drawing operations, generally
providing about 10% better performance than the drivers shipped with
MicroStation.
* Full dual screen support for dual graphics monitor support with the
8514 graphics boards.
* Anti-aliasing for jaggie free displays.
* Protected-mode design allows it to become an integral part of the
application and requires none of the 640K DOS RAM.
* Font selection with 6 different fonts ranging from 8 to 18-point font
size.
System Requirements
To run MicroStation Driver your computer system must be capable of
running your intended application.
* 386 computer with math co-processor
* MicroStation (protected mode) or MicroStation SOLIDS (protected mode).
* An 8514 graphics accelerator board. For dual monitor support, you will
also need a VGA graphics board.
1
Installation
Installation for MicroStation Driver
Your Microstation Driver can be easily installed with minimum effort:
1. Run INSTALL.EXE and select the 'Install Device Drivers' option.
2. Choose the 'Microstation' entry.
3. Follow the instructions as given by the Installation program.
Use the F1 key to bring up context-sensitive help screens at any
point in the installation process.
Included Files
The following files are included with the 8514 MicroStation 4.0 driver.
README.USD This file in standard ASCII format.
ATIU408.EXP The executable driver file which is unarchived by INSTALL.EXE
into the DRIVERS sub-directory, created by MicroStation when
MicroStation is installed. The DRIVERS sub-directory is
located just below the root MicroStation directory
(C:\USTN40\DRIVERS).
ATIU408.MA This .MA file is required by MicroStation to interface
between the protected mode driver (ATIU408.EXP) and the
MicroStation executable file. This file loads and
unloads, and handles all calls to the .EXP file at
MicroStation's request. The .MA file is the file located
by MicroStation when it reads its CONFIGUR.DAT file,
located in the C:\USTN40\DATA directory, using the
MicroStation environment variable MS_PMGRAPH.
MicroStation only knows how to load a .MA file, not a .EXP
file, so it is up to the .MA file to load the .EXP.
ATIU408.MA file is also unarchived by INSTALL.EXE at the time
of installation and placed in the DRIVERS sub-directory
along with ATIU408.EXP.
ATIU408.MGL This file is just a text file whose first line contains the
line 8514 MicroStation 4.0, which is displayed by the
MicroStation USCONFIG program to allow you to select this
MicroStation 4.0 driver. The .MGL file is uncompressed by
handled by INSTALL.EXE into the DRIVERS sub-directory along
with the .MA and .EXP files (all three files should have the
same name).
ATICFG8.DAT This is the text file created by INSTALL.EXE to be read by
ATIU408.EXP file during driver initialization.
2
Technical Notes
Anti-Aliasing
Anti-aliasing is technical jargon for the process by which graphics
drivers create the effect of smooth lines on your screen. In normal
graphics modes most lines exhibit a stair-step effect (jagggies) which
detracts from the straightness of the line. Anti aliasing "blurs" those
stair-steps to create the illusion of a straight line.
Lines in standard graphics are a single pixel (screen element) wide,
with that pixel being the actual color of the line. Anti-aliasing draws
most lines using 2 pixels, with each pixel pair summing to a full
intensity of the desired color, visually. In this way, the eye is fooled
into seeing two pixels as only one, at some position midway between the
two anti-aliased ones.
Anti-aliasing is accomplished by using the palette entries (colors)
above color 15 (16-255) to store graded shades of the first 16 colors (0-
15) compared to the background color. The graded shades of these 16
color are computed and loaded automatically by the driver once
MicroStation communicates the base 16 colors and the background color to
driver. The background color is user set with the AA_BACKGROUND_COLOR
option in the ATIUCFG8.DAT file.
By using this graded palette shading technique, the MicroStation driver
is essentially trading the number of available colors (16 from 256) for
smooth anti-aliased lines. If you try operating the MicroStation driver
in anti-aliased mode in a 16 color graphics mode, the MicroStation driver
will ignore the anti-aliasing and just use the 16 colors available for
that graphics mode. This is done because the MicroStation driver assumes
that your graphics board is only capable of 16 simultaneous colors and,
since anti-aliasing requires at least 256 colors, ignores the anti-
aliasing mode.
The USCONFIG.EXE Program
The MicroStation configuration program USCONFIG.EXE, when run, will
search the DRIVERS sub-directory for all files with the extension .MGL
and display the first line of each file found as an entry under the
Vendor Supplied Driver selection menu. If the user picks a .MGL menu
entry, an initialization program specified by the .MGL file's second line
(if any) will be executed before continuing.
3
The UCONFIG.DAT File
There is a file called UCONFIG.DAT, located in the DATA sub-directory,
created by MicroStation when User Preferences are saved during a
MicroStation session. If MicroStation is configured to use a protected
mode driver, the variable MS_PMGRAPH will be set in the .DAT file to the
path(s) containing your protected mode driver that exist at the time the
UCONFIG.DAT file is executed. If you subsequently exit MicroStation and
reconfigure the display driver for a different protected mode driver,
MicroStation will not recognize the new configuration unless you change
the UCONFIG.DAT file. Using a text editor, change the line containing
the MS_PMGRAPH to point to the new protected mode driver(s). Do not
delete this file, otherwise you will lose all your other MicroStation
customizations.
Becoming an Integral Part of MicroStation
Because the MicroStation Driver is for MicroStation applications only,
it can become an integral portion of that program and is basically
transparent to the user. The MicroStation Driver runs in protected-mode
taking advantage of your 386 computing power. MicroStation Driver is
not a TSR (terminate and stay resident program) so it does not have to be
loaded in the valuable lower 640K of RAM that many other programs
require.
4