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- ID:XG XGA video and Quarterdeck Products
- Quarterdeck Technical Note #208
- by Quarterdeck Testing & Compatibility Department
- last revision: 6 February 1992
-
- XGA.TEC
-
- This is about XGA, a new high-resolution video standard developed by IBM,
- and how it works with Quarterdeck products.
-
-
- WHAT DO I DO ABOUT THE "UNRECOGNIZED MICROCHANNEL ADAPTER 8FDB" REPORT WHEN I
- BOOT WITH QEMM-386 (OR QEMM 50/60 OR QRAM)?
-
- Add this line:
-
- 8FDB XGA Video Adapter
- /NT
-
- to the file "MCA.ADL" in the QEMM (or QRAM) directory. All the "/NT" does is
- pass the NT parameter to QEMM-386; the only service this provides is to keep
- the QEMM-386 logo from being defaced during boot.
-
- DOES THIS CARD USE HIGH ADDRESS SPACE?
- The XGA card has an Adaptor ROM whose position cannot be set with the
- Reference Diskette: it is self-configuring only. QEMM-386 detects this use
- of the high address space and does not map over it. Version 6 of QEMM-386
- does not Stealth this ROM because it is not accessed by interrupt.
-
- WINDOWS ENHANCED MODE
- Does Windows complain about a video conflict when QEMM-386 is loaded?
- The problem is a bug in XGAVDD.386, Windows' XGA driver. It will not load if
- there is RAM at the first 4K region of the 32K region in which the XGA ROM is
- located. Therefore, on a system with the XGA at D600-D7FF, it fails if QEMM-
- 386 has placed High RAM at D000-D0FF. So an eXclusion of D000-D0FF ("X=D000-
- D0FF") on the QEMM386.SYS line of the config.sys:
-
- device=c:\qemm\qemm386.sys ram x=d000-d0ff
-
- fixes the problem. A better solution is to use the default Windows *VDDVGA
- driver instead of XGAVDD.386. We know of no adverse consequences to doing
- this; you may still use XGA video modes in Windows Enhanced with the *VDDVGA
- driver. This is done by replacing the line:
-
- display=XGAVDD.386
-
- in the SYSTEM.INI file with:
-
- display=*VDDVGA
-
- WINDOWS STANDARD MODE
- You can't run Windows Standard mode in an XGA video mode under versions
- of QEMM-386 up to and including 6.00. It frequently seems to work, but
- eventually the system crashes and reboots. Using Windows Standard mode in a
- VGA mode is no problem. QEMM-386 6.01 and later versions are able to work
- with Windows Standard Mode configured for XGA.
-
- DESQVIEW
- DESQview does not support XGA-specific modes. DESQview loses control of
- the screen completely when a program enters an XGA-specific mode. DESQview
- cannot display its menus or other DESQview windows on the screen, though the
- XGA application can display successfully from within DESQview. A work-around
- would be to switch a program running in an XGA mode to text mode (for example,
- shell to DOS or open a DOS window from Windows 3) when you wish to switch to
- another DESQview window. There are no problems using an XGA card in VGA modes
- in DESQview.
-
-
- ************************************************************************
- *This technical note may be copied and distributed freely as long as it*
- *is distributed in its entirety and it is not distributed for profit. *
- * Copyright (C) 1990-2 by Quarterdeck Office Systems *
- ************************ E N D O F F I L E *************************