I am seeing something weird, and I’m wondering if anyone
else has seen it. A customer using an old 4.22 one a 486
system with Watcom Graphics at 1024x768 mode is putting up
some circles on the screen. When porting to 4.25 on a P133,
the speed in which the circles are drawn is very slow. It
appears that the slowness may be related to an increase in
the time it takes to switch video memory banks.
We tried this on a variety of old Video card hardware
with no improvement. Anyone have any idea what might
be going on?
Mitchell Schoenbrun --------- maschoen@pobox.com
How about the old software on the P133?
I had a problem before where a faster processor was outrunning some older
hardware (commercial ISA card) and slowed the whole system down. Turns out
because I couldn’t get the old 486, the whole system needed to be changed.
CHL
“Mitchell Schoenbrun” <maschoen@pobox.com> wrote in message
news:Voyager.010801201625.204B@schoenbrun.com…
I am seeing something weird, and I’m wondering if anyone
else has seen it. A customer using an old 4.22 one a 486
system with Watcom Graphics at 1024x768 mode is putting up
some circles on the screen. When porting to 4.25 on a P133,
the speed in which the circles are drawn is very slow. It
appears that the slowness may be related to an increase in
the time it takes to switch video memory banks.
We tried this on a variety of old Video card hardware
with no improvement. Anyone have any idea what might
be going on?
Mitchell Schoenbrun --------- > maschoen@pobox.com
Previously, Captain High Lighter wrote in qdn.public.qnx4.devtools:
I had a problem before where a faster processor was outrunning some older
hardware (commercial ISA card) and slowed the whole system down. Turns out
because I couldn’t get the old 486, the whole system needed to be changed.
I’m curious to know more about how the faster processor was outrunning the
hardware. Do you mean the video hardware, or something else?
Thanks
Mitchell Schoenbrun --------- maschoen@pobox.com
No, it was a disk drive interface. It is probably not exactly relevant, I
was just making the point it might not be OS-related if you changed the
processor also.
I never investigated what the mechanism was once I understood how to get rid
of it: Replace the other hardware also, although slowing the fast processor
down with disabling memory cache also worked to speed the system
performance. Perhaps onboard BIOS extensions did bad things?
The only problem I ever had with actual VGA hardware was newer onboard BIOS
extension with an older 286 processor, but this is obviously not your
problem. Although interesting some company (with a name like
supercompressed carbon) will sell the incompatible BIOS software with only
revision letter change on the board.
I was just stating the obvious about how does old OS work on new hardware.
Too many times I have made an assumption the problem was in software or
hardware and wasted time because my assumption was wrong, and I would have
got there faster if some one made the obvious suggestion (even I admit I
would hate him after…)
“Mitchell Schoenbrun” <maschoen@pobox.com> wrote in message
news:Voyager.010803160414.205D@schoenbrun.com…
Previously, Captain High Lighter wrote in qdn.public.qnx4.devtools:
I had a problem before where a faster processor was outrunning some
older
hardware (commercial ISA card) and slowed the whole system down. Turns
out
because I couldn’t get the old 486, the whole system needed to be
changed.
I’m curious to know more about how the faster processor was outrunning the
hardware. Do you mean the video hardware, or something else?
Thanks
Mitchell Schoenbrun --------- > maschoen@pobox.com