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[Paul Koning]

>>>>> "Tony" == Tony Duell <ard at p850ug1.demon.co.uk> writes:

 >> >>>>> "Tony" == Tony Duell <ard at p850ug1.demon.co.uk> writes:
 >> 
 Tony> I suppose you could include the Pro 325 and 350 (no I/D, F11
 Tony> chip) and the Pro 380 (split I/D, J11 chip). But those will not
 Tony> run normal PDP11 software, the I/O is totally different I
 Tony> believe.
 >> It certainly is -- different and very badly conceived.  But then
 >> again, Unibus and Q-bus are also different (though not by the same

 Tony> Unibus and Qbus are actually quite similar, to the extent that
 Tony> devices for either bus generally look the same to the software
 Tony> (the DL11 and DLV11 serial ports have the same registers, same
 Tony> bit allocations, ...

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...

	  paul