Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!mnetor!seismo!rutgers!caip!cbmvax!grr
From: grr@cbmvax.cbm.UUCP (George Robbins)
Newsgroups: net.arch
Subject: Re: 68000 Memory Managment (Bechtolsheim patent) (SUID Patent)
Message-ID: <877@cbmvax.cbmvax.cbm.UUCP>
Date: Sat, 11-Oct-86 13:22:49 EDT
Article-I.D.: cbmvax.877
Posted: Sat Oct 11 13:22:49 1986
Date-Received: Sat, 11-Oct-86 22:05:46 EDT
References: <727@sauron.UUCP> <610003@hpcnoe.UUCP> <2197@vrdxhq.UUCP>
Reply-To: grr@cbmvax.UUCP (George Robbins)
Organization: Commodore Technology, West Chester, PA
Lines: 48

In article <2197@vrdxhq.UUCP> deller@vrdxhq.UUCP (Steven Deller) writes:
>In article <610003@hpcnoe.UUCP>, jason@hpcnoe.UUCP (Jason Zions) writes:
>> Jerry Leichter says:
>> 
>> 
>> If memory serves, the PDP-15 was a pair of -11's hooked up in tandem (in the
>> same way a PDP-12 was a pair of PDP-8's in tandem). Exactly what the PDP-15
>> and PDP-12 were used for, I couldn't tell you.
>> 
>Sorry to correct you, but your information is so far off base that it requires
>correcting.  The PDP-15 and PDP-12 were not at all how you describe them.
>
>The PDP-15 was an 18-bit computer, derived from the 18-bit PDP-9, which 
>derived from the 18-bit PDP-7 (one of the original UNIX base machines), which
>had a common ancestor with the 36-bit PDP-6 in the PDP-4.  The PDP-15
>primarily added 8 index registers and slight modifications to the instruction
>set to handle them, plus some better I/O controls.

Perhaps this person was confused by the PDP-15/76, which was a PDP-15 with a
small PDP-11 (/05?) built in as an I/O processor.  The PDP-11 was somewhat
modified so the parity bits in its memory and data paths could be used to
pass the 18 bit data used by the PDP-15.

>  PDP-14 was a non-computer, methodology for building discrete logic
>    systems from R and S series flip-chips (DTL logic).

Noooo, the PDP-14 was a 'programmable' industrial controller.  The PDP-16 was
the do-it-yourself 'computer' using register transfer modules.  I'd never
seen something so intersting with such completely confusing documentation.

They were M series (DTL and/or TTL) modules, please.  The R and S were DCD
(diode-capacitor-diode) logic used in the original PDP-8 and other products
in that timeframe.
  
Now to leave something correctable: (-8

My old PDP-10 manuals leave the operating system almost nameless, alluding to
things like Timesharing Monitors 10/40 and 10/15 which had been rechristened as
'The Multiprogramming Disk Monitor' and 'Swapping Monitor'.  These had derived
from the PDP-6 monitor programs.  My PDP-6 manuals are buried too far down to
see what they called it.  Now was TOPS-10 a new products, or just a marketing
name for the older monitor program, along with the revisionistic DECsystem-10
name?

-- 
George Robbins - now working for,	uucp: {ihnp4|seismo|caip}!cbmvax!grr
but no way officially representing	arpa: cbmvax!grr@seismo.css.GOV
Commodore, Engineering Department	fone: 215-431-9255 (only by moonlite)