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From: kent@decwrl.dec.com (Christopher A. Kent)
Newsgroups: comp.arch,comp.unix.wizards,comp.os.minix
Subject: Re: pdp-11/55
Message-ID: <72@bacchus.DEC.COM>
Date: Thu, 8-Oct-87 02:41:51 EDT
Article-I.D.: bacchus.72
Posted: Thu Oct  8 02:41:51 1987
Date-Received: Sat, 10-Oct-87 18:39:07 EDT
References: <1755@ncr-sd.SanDiego.NCR.COM> <275@usl> <29933@sun.uucp> <2949@phri.UUCP> <1806@gryphon.CTS.COM> <3019@ames.arpa>
Reply-To: kent@decwrl.UUCP (Christopher A. Kent)
Organization: DEC Western Research Laboratory
Lines: 14
Xref: mnetor comp.arch:2549 comp.unix.wizards:4762 comp.os.minix:1832

A very large difference between the 11/60 and 11/70 was that the 11/70
had split instruction and data spaces. So operating systems that knew how
to make use of this feature (that is, Unix) could run much larger programs.

The 11/45 was the only other 11 to have this feature. DEC never produced an
operating system that took advantage of it, because EVERYTHING was supposed
to be able to run on the least common denominator hardware. On the other
hand, I've heard all sorts of stories about what they're doing to squeeze
more and more bits into RSTS, so who knows if this is still true?

chris
-- 
Chris Kent	Western Research Laboratory	Digital Equipment Corporation
kent@decwrl.dec.com	decwrl!kent			(415) 853-6639