Newsgroups: alt.folklore.computers
Path: utzoo!henry
From: henry@utzoo.uucp (Henry Spencer)
Subject: Re: Y VAX? [was : TECO on a DEC-System 10]
Message-ID: <1990Jan19.193106.25786@utzoo.uucp>
Organization: U of Toronto Zoology
References: <153.UUL1.3#5131@mvac23.UUCP> <457@ns-mx.uiowa.edu> <3479@tahoe.unr.edu>
Date: Fri, 19 Jan 90 19:31:06 GMT

In article <3479@tahoe.unr.edu> ted@tahoe.unr.edu (Ted Sarbin) writes:
>The PDP-11/40 was NOT an OEM version of the 11/45.  The OEM version of
>the 11/45  was the 11/45.  The 11/40 was a microprogrammed, machine
>which was slower than the 11/45 ...

Basically correct but slightly misleading.  The 11/20 was the *only*
non-microprogrammed 11, and indeed its design compromises account for
some of the 11's oddities (e.g. INC and ADD #1 don't set condition codes
the same way).  The next generation -- 05 aka 10, 40, and 45 -- were all
microcoded.
-- 
1972: Saturn V #15 flight-ready|     Henry Spencer at U of Toronto Zoology
1990: birds nesting in engines | uunet!attcan!utzoo!henry henry@zoo.toronto.edu