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-
- Revision 2.0 April 27, 1992
- OS/2 SVGA NETINFO
- -----------------------
- INTRO:
-
- This document is a collection of information about OS/2 and SVGA video
- adapters. I'll start out with known problems, some FAQs, and then
- go into a description of all the SVGA-related files under OS/2 and thier uses.
- If you find erroneous or incomplete information, please send a note to the
- email address that the end of this document. Thanks and enjoy!
-
- KNOWN PROBLEMS, AFFECTED SYSTEMS, AND SOLUTIONS:
-
- P: Video goes out of sync entering a DOS or WINOS2 fullscreen.
- A: Video adapters using the Tseng ET4000 chipset with batch #TC6059AF or
- higher.
- S: Get the new VSVGA.SYS dated 4-8-92 or later.
-
- P: When I window a DOS fullscreen running in SVGA I often get a Trap E.
- A: Will be prevalent on overcommited (low-memory) systems. The PM driver you
- are using can also have an effect.
- S: Get the new VSVGA.SYS dated 4-20-92 or later.
-
- P: Install / bootup hangs
- A: Video cards based on the Western Digital PVGA1D chipset.
- S: Get the new BVHSVGA.DLL dated 4-21-92 or later.
-
- P: Get a SYS3176 error starting any DOS session
- A: Tseng ET3000 based adapters
- S: ? Soon
-
- P: ? Install
- A: Oak technologies video cards
- S: ?
-
- The latest VSVGA.SYS and BVHSVGA.DLL files will be distributed wherever
- possible..I don't know how they will find there way to you..but if you
- need them, ask around and look for them. On the internet, the latest fixes
- will be on HOBBES.NMSU.EDU, which happens to be an excellent FTP site for
- all kinds of OS/2 goodies.
-
- QUESTIONS AND ANSWERS:
-
- Q: I'm having problems with my video.
- A: Start by reading the README in your root directory.
-
- Q: What SVGA support is actually provided with OS/2 2.0 GA edition?
- A: The only support that is provided in the shrink wrapped version is the
- ability to switch away from a DOS or OS/2 fullscreen and have the current
- state of your video card saved.. and this is only after you have turned
- SVGA ON, and if you have one of the adapters listed in the readme..although
- everyone with a Tseng, Trident, ATI, Headland, or Western Digital chipset
- should try turning SVGA ON at least for a while to see if it fixes any
- unseemly video problems they might be having.
-
- Q: What is the most important thing to remember about turning SVGA ON?
- A: When you type SVGA ON (as per readme) it must be in a DOS FULLSCREEN!
-
- Q: For what adapters has DOS + OS/2 fullscreen save/restore been tested?
- A: ATI VGA Wonder XL
- Boca Reseach SVGA
- Orchid Prodesigner II
- STB Powergraph
- Trident 8900C and 8900B
- Video 7 VRAM II
- Paradise VGA Professional
-
- Q: Are these the only cards which are "compatable" with OS/2?
- A: NO. Our support is designed to be generic for the Trident, Tseng, ATI,
- Headland, and Western Digital chipsets. There are likely many more cards
- which work under OS/2 which we havn't even tried. If you have a card which
- isn't on this list, but does work, please send a note to the email address
- at the bottom of this document with the name of the card and any small
- limitations you found.
-
- Q: How do I get my PM desktop to use SVGA?
- A: OS/2 does not provide any PM SVGA drivers.. they are available from the
- video board manufacturers. Trident has an amazing set of OS/2 2.0 16-bit
- PM drivers that include seamless windows support and virtual desktops.
- Orchid has 16-bit 2.0 drivers in beta test..maybe released. And there are
- many OS/2 1.3 drivers around which function fine under 2.0. Do not be
- deterred from using a PM display driver labeled for OS/2 version 1.3
-
- Q: What is the difference between 16-bit and 32-bit PM drivers?
- A: Because OS/2 shipped at the end of March without the 32-bit
- graphics engine, the video subsystem is all 16-bit. Therefore, all PM
- drivers that work on OS/2 2.0 GA are 16-bit. This will change come summer
- when the 32-bit graphics engine ships. At that point it will become
- possible to have a fully 32-bit graphics subsystem. BTW: 32-bit does not
- imply 32-bit color, it only means 32-bit computation and data transfer.
-
- Q: What is a virtual desktop?
- A: It is a PM display driver that uses all of the adapter's video memory to
- store a desktop that is bigger than what's actually displayed. So, you
- could have 1024x1024 of desktop space, with only 640x480 being displayed on
- the screen. You move to other portions of the desktop by dragging the
- mouse to the edge of the screen, which scrolls the desktop. Because of the
- way OS/2 is designed, this is an extremely quick operation and will be very
- smooth even on the slowest video cards. The PM driver has to be coded to
- support virtual desktops, and Trident is so far the only chipset to support
- it.
-
- Q: What is Seamless Windows, and can it co-exist with SVGA?
- A: Seamless windows is the ability to run Windows 3.x programs on the PM
- desktop.. Microsoft said it could never be done!! The way it is achieved
- is by making a "hole" in the PM desktop that the seamless windows driver
- writes into. Special code has to be put into both the windows driver and
- the PM display driver to support this. Stone Li from Trident was able to
- produce 800x600/16 seamless drivers for Trident in about a week, and has
- been the only one to produce SVGA seamless support so far.
-
- Q: Will my Windows 3.0 drivers work in WinOS2?
- A: Yes, you should be able to simply update the SYSTEM.INI to point to a new
- windows display driver, or just copy over VGA.DRV in the
- OS2\MDOS\WINOS2\SYSTEM directory. Keep in mind, however, that Windows in
- SVGA will only work if you have SVGA ON.
-
- Q: Why do I have to deal with this SVGA ON and OFF crap?
- A: Because we've torn out many clumps of hair discovering all of the crazy
- things that can happen when you try to provide video support for for so
- many different boards, each with their own quirks. Most importantly, we
- found that turning SVGA ON actually caused some system's video to become
- worse.. so we had to have a way to give the user the ability to switch back
- and forth. And so was born the SVGA ON OFF thing. Hopefully a more
- elegant system will be developed in the future.
-
- Q: I have an ATI 8514 Ultra or Graphics Ultra, does it work under OS/2?
- A: This card is 100% 8514 compatable, and OS/2 detects and treats it like an
- 8514. On difference, though, is that you should update the video line in
- your CONFIG.SYS that reads:
- DEVICE=\OS2\MDOS\VVGA.SYS
- to:
- DEVICE=\OS2\MDOS\VSVGA.SYS
- Because OS/2 detects it as 8514, you can use OS/2's 8514 PM in WinOS2
- display drivers with no problems.
-
- Q: What is the outlook for OS/2 support for boards based on the S3 or TI
- chipsets?
- A: Boards which are co-processed are the fastest, but also take the longest to
- develop software for. No manufacturers have announced dates yet for
- support for any of these cards. The more these manufacturers are
- "encouraged" by owners of their cards, the faster the support will arrive.
- So, get on the phone and call! (but be pleasant :-)
-
- Q: I'm getting some corruption returning to my WinOS2 fullscreen
- A: Set your VIDEO_SWITCH_NOTIFICATION in the DOS SETTINGS to ON.
-
- Q: Even in VGA, games in a DOS fullscreen are shakey
- A: Set your VIDEO_RETRACE_EMULATION in the DOS SETTINGS to OFF.
-
- Q: Alot of DOS apps in a window have messed up colors
- A: This is a limitation of the VGA desktop. The color palatte of the DOS
- session has to be translated to PM, and the 640x480/16 desktop doesn't
- offer enough colors to do a good translation. The only solution to the
- problem is to use a 256 color PM driver.
-
- Q: The graphics of some of my apps are completely screwed up when in a window
- A: Chances are, this app is using a non-standard VGA mode that the card can
- support, but which OS/2 doesn't. Support for some of these modes (like
- 320x400/256 and 360x480/256) will likely be added in base OS/2 support
- soon.
-
- Q: My friend has the same video card as me, and it doesn't work.. can't I
- just give him a working SVGADATA.PMI file?
- A: No. The SVGADATA.PMI has to be specific to each adapter/monitor setup.
-
- Q: If I have SVGA ON, can I use 132 column modes in an OS/2 fullscreen?
- A: yep.
-
- Q: If I have SVGA ON, can I window a DOS fullscreen onto the PM desktop, even
- if it is Super VGA?
- A: yep!
-
- Q: If I have SVGA ON, can I take a window with a SVGA image in it can paste
- to the clipboard?
- A: YEP!
-
-
- THE FILES:
-
- \OS2\SVGADATA.PMI
- This file serves as a flag to tell OS/2 whether SVGA support has been
- enabled with SVGA ON. The file actually contains data on
- 1. What video chipset your SVGA card has.
- 2. What SVGA modes, from the supported list, your adapter is capable of
- setting. The list of supported modes is:
- a. 640x480/256
- b. 800x600/16
- c. 800x600/256
- d. 1024x768/16
- e. 1024x768/256
- f. 132x25 text
- g. 132x43 or 44 text
- 3. What values are in the video registers when the card is in each
- mode.. this data is used by OS/2 to save and restore the registers
- to their proper state when switching between sessions with
- different SVGA modes set.
- This data file must be generated by typing SVGA ON from a DOS
- FULLSCREEN, because what SVGA ON actually does is set all the possible
- modes using the video card's BIOS and then read out the values of the
- registers into the .PMI file. If SVGA ON is run from a DOS window,
- OS/2's video virtualization takes over, and the BIOS doesn't set the
- svga modes properly.
- \OS2\SVGA.EXE
- This is the utility that generates the .PMI file and places it in the
- \OS2 subdirectory. Syntax is SVGA [ON][OFF][STATUS], where
- ON: creates the \OS2\SVGADATA.PMI file and enables SVGA support.
- OFF: deletes the .PMI file.
- STATUS: returns the chipset type OS/2 thinks your card is.
- \OS2\DLL\DISPLAY.DLL
- This file determines what video resolution the PM desktop uses.
- This is the PM display driver and the heart of OS/2 video. The
- equivalent file on a Windows system is the VGA.DRV (in the case of
- VGA) file. For the first release, SVGA systems will have a VGA
- display driver installed on their system. Already, SVGA drivers are
- available from most of the main board manufacturers. In
- this document, I'll try to list some of the ones that are working.
- \OS2\DLL\BVHSVGA.DLL
- This file is the Base Video Handler for OS/2. Any OS/2 application
- that sets a video mode calls this DLL. In most cases, however, the
- only application that sets any video modes is the PM display driver
- and the MODE.EXE utility (for setting 132 column modes). The first
- time this DLL would be called is after the OS/2 bitmap logo appears
- (PM starts up then). This DLL is specified in the CONFIG.SYS in the
- following manner:
- SET VIO_VGA=DEVICE(BVHVGA,BVHSVGA)
- BVHVGA is used to set, save, and restore VGA modes, BVHSVGA for SVGA
- modes.
- \OS2\MDOS\VSVGA.SYS
- This is the virtual video device handler for DOS sessions. All calls
- to change the video mode from a DOS session are handled through this
- driver. This driver's job is to allow the user to set a SVGA mode, and
- when the user switches away, save the current state of the video card
- (its registers and its video RAM). Then, when the user returns to the
- DOS session, restore the video card to it's previous state. When there
- is no .PMI file (SVGA is OFF) this driver acts like a VGA driver,
- except for adapter-specific code in it to make sure the VGA modes work
- right on the SVGA adapter. Therefore, even if you don't want SVGA,
- you'll probably want VSVGA.
- \OS2\MDOS\WINOS2\SYSTEM\VGA.DRV
- \OS2\MDOS\WINOS2\SYSTEM\SWINVGA.DRV
- These are the WINOS2 and seamless WINOS2 drivers, respectively. They
- determine what resolution WINSO2 uses.
-
- Bernie Thompson PSU student and IBM co-op
- Send comments/additions to:
- BERNIET@BCRVMPC1.VNET.IBM.COM
-
- ***************************************************************************
- * DISCLAIMER *
- * ---------- *
- * The opinions and suggestions contained herein are my own and not those *
- * of my employer. This document does not represent any sort of guarantee *
- * or assurance. Just tips guys... nothing legal, get it? Good. :-) *
- ***************************************************************************
-