22 Jun
2005
22 Jun
'05
1:14 a.m.
On Tue, 21 Jun 2005, Paul Koning wrote:
True. Bad analogy. The "CT bus" (what you
find in a PRO) is about as
different from Unibus/Qbus as the ISA bus, only uglier yet.
The truly bizarre thing is that there are hints of DMA capability in
the books, but no actual PRO I/O device does DMA -- not even the hard
drive controller or the ethernet card. That's one of the many strikes
against it...
So far, I believe that's caused by the periphs of the system,
not
the system (or bus) itself. I can't see any reason why DMA, as is
"advertised", indeed, would not work. Once I'm done with Ultrix
on it, I probably will check with my hardware buddies and see if
we can do some CTI boards- for the heck of it.
--f