Paul Koning <Paul_Koning at Dell.com> wrote: I think he might have meant PRO-385 as an improvement on the PRO-380...? :-) However, the J11 originally didn't deliver the planned 20 MHz, but it sure delivered more than 10 MHz. The reason the PRO-380 stayed at 10 MHz anyway was because the support chips DEC used for the PRO couldn't handle higher speeds. So even though the J11 could deliver atleast 15 MHz (which is what the 11/53 and 11/73 uses) and probably 18 MHz (which is what later 11/73 and the 11/8x use), the PRO (unfortunately) stopped at 10 MHz (which you can't blame on the J11). Even worse (I think) is that P/OS never supported split I/D space, nor supervisor mode, so the PRO makes very little use of the J11 cpu. (The 11/9x machines eventually used 20 MHz J11 cpus.) I couldn't agree more. :-) Johnny -- Johnny Billquist || "I'm on a bus || on a psychedelic trip email: bqt at softjar.se || Reading murder books pdp is alive! || tryin' to stay hip" - B. Idol