[Freedos-user] EMM386 causes Ctrl-Alt-Del to fail with some video cards

2006-04-14 Thread John Hupp



Hello, all. Here is another issue arising 
from my check-out of the new Service Release 2.

I find that loading EMM386.EXE can cause 
Ctrl-Alt-Del to fail. I boot fine, then press Ctrl-Alt-Del from the DOS 
prompt. Thescreen goes black, but the video and system BIOS boot 
messages never reappear. Very occasionallythe keyboard is locked 
altogether and does not execute Ctrl-Alt-Del.


The problem seems to be related to interaction with 
certain video cards - perhaps just PCI cards or cards with a BIOS. I had 
the problem with these cards:
- Diamond Stealth 64 DRAM PCI v2.09 (S3 Trio64 
chip) circa 1994-95 - confirmed with two identical cards
- ATI 3D PCI (Rage LT Pro AGP chip) circa 
1998-99

I did not have the problem with these 
cards:
- Diamond Viper PCI v3.08 (Weitek Power 9000-9001 
chipset) circa 1993-94
- ATI Mach64 PCI (ATI Mach64 chip) circa 
1994-95
- unbranded PCI card (Avance Logic ALG2302 chip) 
age unknown
- Trident 9680 PCI (Trident TGUI9680 chip) circa 
1994-95
I trigger the problem even with 
this minimal DOS configuration:

CONFIG.SYS (from either the hard drive or 
floppy)
DOS=UMB
DEVICE=C:\FDOS\BIN\HIMEM.EXE
DEVICE=C:\FDOS\BIN\EMM386.EXE

(I tried various combinations of EMM386 options: 
NOEMS, X=Test, VDS)
(I also tried SWITCHES=/E/F/N)

AUTOEXEC.BAT: none

Further as-tested system info:
- M Tech R534F Super Skt 7 AT-style mobo with SiS 
5571 chipset
Pentium 100
16 MB
(2) 2.1 GB FAT32 partitions
CD-ROM
floppy
AT keyboard (NOTE: I tried a different known-good 
keyboard to eliminate that possibility)
no mouse connected

--John Hupp


Re: [Freedos-user] EMM386 causes Ctrl-Alt-Del to fail with some video cards

2006-04-14 Thread Michael Devore

At 06:15 PM 4/14/2006 -0400, you wrote:
Hello, all.  Here is another issue arising from my check-out of the new 
Service Release 2.


I find that loading EMM386.EXE can cause Ctrl-Alt-Del to fail.  I boot 
fine, then press Ctrl-Alt-Del from the DOS prompt.  The screen goes black, 
but the video and system BIOS boot messages never reappear.  Very 
occasionally the keyboard is locked altogether and does not execute 
Ctrl-Alt-Del.

I trigger the problem even with this minimal DOS configuration:

CONFIG.SYS (from either the hard drive or floppy)
DOS=UMB
DEVICE=C:\FDOS\BIN\HIMEM.EXE
DEVICE=C:\FDOS\BIN\EMM386.EXE


That's not minimal.  Recommended minimal is EMM386 X=TEST.  Most minimal 
would be EMM386 NOEMS NOVDS X=A000-EFFF.


You should also try NOALTBOOT option since you're having problems with 
Ctrl-Alt-Del.  ALTBOOT is the default condition.





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Re: [Freedos-user] EMM386 causes Ctrl-Alt-Del to fail with some video cards

2006-04-14 Thread chris evans
It probally general protection fault interaction between the vesa 3.0 
video driver and the memory mapped regions that video card wants to 
access.  Have EMM386 exclude the memory area a000-h.


--chris
http://nxdos.sourceforge.net/

John Hupp wrote:

Hello, all.  Here is another issue arising from my check-out of the 
new Service Release 2.
 
I find that loading EMM386.EXE can cause Ctrl-Alt-Del to fail.  I boot 
fine, then press Ctrl-Alt-Del from the DOS prompt.  The screen goes 
black, but the video and system BIOS boot messages never reappear.  
Very occasionally the keyboard is locked altogether and does not 
execute Ctrl-Alt-Del.






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