VGA Display Card in a 386i, strange experience
Paul Matz
ppgbms!paul at philabs.philips.com
Tue Dec 13 19:56:07 AEST 1988
We are in the process of developing a hybrid Unix/DOS system that uses a
VGA display for the DOS application. We've had some interesting and
strange results. Here are some of them, and some questions for the
masses:
o With a VGA card installed in an AT slot, and the appropriate lines in
boards.pc and setup.pc un-commented (distribution version of boards.pc
contains VGA definition that is commented out), it seems impossible
to start a DOS task that uses the display connected to the VGA card,
as its "primary" display device, without also openning a blank DOS
window on the 386i monitor. Using the "-w" option to start DOS from
a sunview command window, the error message:
can't un-track memory, permission denied.
is received, and the sunview window where the command was issued hangs
and finally coredumps. It seems that there is conflict between the
software emulated text-only (monochrome or CGA?) interface and the
hardware on the VGA card that is also capable of doing that work. Is
there a way to fool VP/ix into thinking the VGA card is just another
peripheral, eliminating this conflict, while still providing the VGA
characteristics to a DOS application?
o Is there a list of VGA cards that Sun has tried and are known to
work well?
o Does DOS on the 386i make a distinction between the "primary" and
"secondary" display, as does DOS on a PC?
o Will "DOS -w" ever work from a serial login or rlogin connection?
"DOS -w" seems to work in a psterm window running under NeWS. Am
I being fooled? Does sunview need to be running for DOS to work?
Please send any responses to: ppgbms!paul in addition to posting
responses.
Thanks (wishful thinking)
Regards,
Paul Matz
PPG Biomedical Systems
Pleasantville, NY.
914-741-4685
ppgbms!paul
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