FDDI, was: Re: [rescue] u2 drive trays
mcguire at neurotica.com
Tue Aug 19 12:48:36 CDT 2003
On Tuesday, August 19, 2003, at 01:34 PM, Jonathan C. Patschke wrote:
>> the defpa.* bus_dma changes, were, according to the netbsd diffs
>> quite straightforward, if i interpret it right.
>> the pqd.* changes are a magnitude larger
> What is pdq, anyway? Is that the actual controller chip on the DEFxA?
PDQ is the name of DEC's general FDDI interface architecture, which
most of their FDDI controllers use. I don't know much about it, but I
do know there's an 68K on there...serious smarts. It's also nice in
that it implements SMT on the board, which some other controllers
don't. Probably because of the aforementioned smarts. :)
DEC's PDQ-based FDDI controllers are:
DEFPZ (Mezzanine PCI)
DEFQA (Qbus...which is slower than FDDI!)
Dave McGuire "You don't have Vaseline in Canada?"
St. Petersburg, FL -Bill Bradford
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