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101090 discussions

PDP-11 architecture Was: internet blocking problem ?

by jnc＠mercury.lcs.mit.edu

> From: Jon Elson elson > I actually LIKED the PDP-11 architecture quite a LOT, but the limited > memory was a big killer. The good thing about the PDP-11 was the 16-bit word size. (It resulted in what's probably the most elegant architecture, in bang/buck terms, of all time.) The bad thing about the PDP-11 was the 16-bit word size. (For the reason you point out.) Noel

10 years, 10 months

punchcard svg file available

by simski＠dds.nl

Hi All, just to let you know that i've made a vector graphics file for A hollerith punchcard. https://hack42.nl/wiki/Bestand:Punchcard.svg enjoy -- Met vriendelijke Groet, Simon Claessen drukknop.nl

10 years, 10 months

internet blocking problem ?

by jnc＠mercury.lcs.mit.edu

> From: Jon Elson > so MANY others who could not access the members.iinet page were finding > they got stopped at cogentco. ^^^^^^^^^^^^^^^^^^^ Well, to be precise 'Cogentco was the last node on the route which responded'. It's impossible to say whether i) that node tossed packets that tried to go further; ii) it forwarded them to some other node (identity unknown) which did toss them (and didn't allow/handle traceroute), etc. One can't draw any conclusions about whether it's i) from the fact that it's _also_ still responding to traceroute packets sent to that address: one would have to know whether it does the a) 'is this packet to a destination I'm filtering' check before it does the b) 'I decremented the TTL and it's now zero', or the other way around. If b) it could be the node that's dropping the packets. But given that other 'last hops' are also producing similar results, I'm still thinking it's Ii.net which is tossing the packets, not the 'last hop' one can see on traceroutes. Noel

10 years, 10 months

PDP-11 architecture Was: internet blocking problem ?

by jnc＠mercury.lcs.mit.edu

> From: Johnny Billquist > it really is a few bits short of perfect ... > .. when you look at the EIS and FPP extensions, which could not > retain the general instruction layout format because of a lack of bits. Well, if they'd tried to keep the same general layout, I don't think EIS, floating point, etc would have all fit in 16 bits. Maybe they should have made it a 18-bit machine? ;-) But I keep circling back to the observation that the -11 architecture's incredible flexibility/complexity ratio happened precisely _because_ it had to be crammed into 16 bits (along with a big dollop of genius :-). Given that I think the big challenge of the next generation of computer science is going to be managing complexity, it's too bad we don't teach more young CS students the -11 and UnixV6 - to show them just how much you _can_ do, with how _little_, if you put your mind to it. > I still would not consider overlays as any part of the PDP-11 > architecture. But maybe that is just me. No, I agree with you 100%. Plenty of PDP-11 OS's did not support them. Noel

10 years, 10 months

IBM 026

by COURYHOUSE＠aol.com

who could be lucky enough to own 2 link 8s? Ed@ In a message dated 9/11/2015 10:22:34 A.M. US Mountain Standard Time, wdonzelli at gmail.com writes: Yeah, about those... Warning! Warning! -- Will On Sep 11, 2015 11:06 AM, "Paul Koning" <paulkoning at comcast.net> wrote: > > > On Sep 11, 2015, at 10:58 AM, Noel Chiappa <jnc at mercury.lcs.mit.edu> > wrote: > > > >> From: Ed Sharpe > > > >> well SMECC needs one hopefully to make work so we can show the youn'ins > >> how cards were punched! > > > > Well, here's an 029 (not quite what the OP was looking for, but good > enough > > for you all, I expect) for a not insane amount of money: > > > > http://www.ebay.com/itm/281796720725 > > Is that TWO Linc-eight systems in the background??? > > paul > >

10 years, 10 months

IBM 026

by jnc＠mercury.lcs.mit.edu

> From: Ed Sharpe > well SMECC needs one hopefully to make work so we can show the youn'ins > how cards were punched! Well, here's an 029 (not quite what the OP was looking for, but good enough for you all, I expect) for a not insane amount of money: http://www.ebay.com/itm/281796720725 Noel

10 years, 10 months

KDJ11-A/M8192 identified as PDT11/50 from resorc /a?

by holm＠freibergnet.de

..have repaired a HH725 Harddisk /TA7245BP was bad since a tantal Elko had a short) and booted now RT11 V5.07 with the new now repaired 1/73 CPU. Resorc /A give the following informations: .resorc /a RT-11XB (S) V05.07 Booted from DL0:RT11XB Resident Monitor base is 111774 (37884.) USR is set NOSWAP TT is set NOQUIET Indirect file abort level is ERROR Indirect file nesting depth is 3 PDT 11/150 Processor FP11 Hardware Floating Point Unit Extended Instruction Set (EIS) KT11 Memory Management Unit Cache Memory 50 Cycle System Clock Device I/O time-out support Multi-terminal support Hmm, is that normal that the CPU gets identified as PDT11/150? Interestingly it finds an FP11 but the Socket is empty. For an M8186 the output is more that what I've expected: .resorc /a RT-11XB (S) V05.07 Booted from DL0:RT11XB Resident Monitor base is 111774 (37884.) USR is set NOSWAP TT is set NOQUIET Indirect file abort level is ERROR Indirect file nesting depth is 3 PDP 11/23 Processor FP11 Hardware Floating Point Unit Extended Instruction Set (EIS) KT11 Memory Management Unit 50 Cycle System Clock Device I/O time-out support Multi-terminal support Regards, Holm -- Technik Service u. Handel Tiffe, www.tsht.de, Holm Tiffe, Freiberger Stra?e 42, 09600 Obersch?na, USt-Id: DE253710583 www.tsht.de, info at tsht.de, Fax +49 3731 74200, Mobil: 0172 8790 741

10 years, 10 months

internet blocking problem ?

by jnc＠mercury.lcs.mit.edu

> From: Don North > Basically see no problems accessing any of the pages on sites. > ... > 12: be2019.ccr21.lax04.atlas.cogentco.com 22.400ms asymm 8 > 13: no reply > 14: no reply > 15: ae0.cr1.mel4.on.ii.net 217.966ms asymm 19 Oh, that's really interesting. A bunch of us get as far as Cogentco, and then it stops working. But you get through... which implies that the _route_ in Cogentco to Ii.net is OK. Which in turn implies that it's Ii.net who are blocking (via packet drop, I assume), based on the IP _source_ address. So it sounds like the earlier post (too lazy to track it down) which says this is Ii.net responding to complaints from others (since they haven't blocked access to _all_ of ii.net, just that 'members' site) is right. Noel

10 years, 10 months

Amiga 2000HD spotted, STL

by jwest＠classiccmp.org

Local electronics haunt has an Amiga 2000HD on the shelf. I was in a rush so didn't get any particulars. It did not appear to have a monitor or keyboard. Didn't see a price tag, but just from past experience I'd guess the owner tagged it around $50. I'm not in to them, no interest.. But if someone is interested I'd be happy to look further, ship, etc. J

10 years, 10 months

IBM 026

by COURYHOUSE＠aol.com

well SMECC needs one hopefully to make work so we can show the youn'ins how cards were punched! hopefully something to be gotten here in AZ but I am open.... Thanks Ed# _www.smecc.org_ (http://www.smecc.org) In a message dated 9/10/2015 5:27:02 P.M. US Mountain Standard Time, isking at uw.edu writes: Are you looking for one to buy, to use, to study for restoration...? I know some folks who have them, but they're not for sale. :-) On Tue, Sep 8, 2015 at 4:59 PM, <COURYHOUSE at aol.com> wrote: > wow... that is absurd! $24,999 > someone needs rehab... > > > In a message dated 9/8/2015 4:57:08 P.M. US Mountain Standard Time, > hilpert at cs.ubc.ca writes: > > > http://www.ebay.com/itm/RARE-VINTAGE-IBM-26-INTERPRETING-CARD-PUNCH-OWN-A-PI > ECE-OF-HISTORY-/161725243156?hash=item25a7935f14 > -- Ian S. King, MSIS, MSCS, Ph.D. Candidate The Information School <http://ischool.uw.edu> Dissertation: "Why the Conversation Mattered: Constructing a Sociotechnical Narrative Through a Design Lens Archivist, Voices From the Rwanda Tribunal <http://tribunalvoices.org> Value Sensitive Design Research Lab <http://vsdesign.org> University of Washington There is an old Vulcan saying: "Only Nixon could go to China."

10 years, 10 months

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