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1991-11-26
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ID:XG XGA video and Quarterdeck Products
Quarterdeck Technical Note #208
by Quarterdeck Testing & Compatibility Department
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.
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.
Copyright (C) 1991 by Quarterdeck Office Systems
* * * E N D O F F I L E * * *