> I am having similar problems with some machines. It looks, at least in my
> case, that the new computers
> doesn't recognizes interruptions that comes from a ISA card, unless you
> directly specify in the PC Setup.
> The problem is that some machine have this option in the Setup, others
> (like Dell computers) don't. If
> someone knows how to solve this question in general please tell me.
I had the problem a couple of days ago with an Athlon board. The fix is
to go into the bios and manually configure the interrupt you are using to
be dedicated to the ISA bus and not to be an available candidate for PnP
configuration.
After I did this, everything worked properly. I wrote a very simple irq
program which simply writes 0xff, 0x00 to the printer port so I could
observe the interrupt response time. THe typical time from the rising
edge of my interrupt generator, to the rising edge of the printer pulse is
about 9-microseconds. This with no load, on a 600mHz athlon using a 2.2.18
and rtlinux-3.0 both of which I downloaded from the rtlinux site two days
ago. When I did this same test two or three years ago with a 200mhz
pentium and linux-2.0.27, some early rtl patch, I got nominal response
times of about 2-microseconds. It's strange that its slower now. Perhaps
the motherboard?
C. Wayne Wright
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C.W. Wright,[EMAIL PROTECTED], Ph:757-824-1698
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NASA, Goddard Space Flight Center
Building N-159 Room E117, Code 972,Wallops Flight Facility
Wallops Island, Va. 23337 Telecommute phone: 410-742-7333
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