Re: DMC integral modem line card schematics

Great, thanks much! paul > On May 11, 2021, at 5:37 PM, Al Kossow via cctalk > wrote: > > On 5/11/21 2:15 PM, Paul Koning via cctalk wrote: >> Does anyone have a DMC11 integral modem line card schematics set? > > another set is up now on bit

Re: LK201 emulator for PS-2 keyboard

> On May 12, 2021, at 1:17 AM, Steve Malikoff via cctalk > wrote: > > Jonathan said >> Just curious; have you thought of adding VSXXX-?? mouse emulation, using >> input from either USB or PS/2 mouse? >> With a mini-DIN output? These are becoming hard to find (aside perhaps from >> our Austr

Re: LK201 emulator for PS-2 keyboard

> On May 12, 2021, at 1:12 PM, Antonio Carlini via cctalk > wrote: > > On 12/05/2021 17:53, Paul Koning via cctalk wrote: >> I remember those. I thought Jonathan was talking about the round ones, but >> I suppose the protocol is identical. There was also a tabl

Re: DECNet for Pro 300 series boxes

> On May 17, 2021, at 2:43 PM, Bob Smith via cctalk > wrote: > > My recollection of Decnet for Pro boxes is that the available SW was > for an end node and not a routing or other capability for the > 380/350/325 boxes. That's how I remember it as well. I think the DEC notion was that a Pro

Re: DECNet for Pro 300 series boxes

> On May 17, 2021, at 8:14 PM, Bill Degnan via cctalk > wrote: > > ... > Maybe I am misunderstanding, but why would the pro be anything but more > decnet-able? > > Bill I'm not sure what you mean. A Pro is a PDP-11 so it could do many DECnet things, especially the Pro 380 since it has mo

Re: Melted computer feet

> On May 20, 2021, at 12:42 AM, Tom Hunter via cctalk > wrote: > > I usually try the following commonly available chemicals listed in > increasing strength: > > 1) warm water with detergent on a microfibre cloth and some elbow grease > 2) alcohol > 3) lighter fluid or white spirit > 4) aceto

Re: IBM PC Network

> On May 23, 2021, at 3:18 PM, Lyle Bickley via cctalk > wrote: > > On Sat, 22 May 2021 23:00:31 -0600 > Grant Taylor via cctalk wrote: > >> ... >> You can find commercial Token Ring cards that support, 4 Mbps, 16 Mbps, >> /and/ *100* Mbps. I see them on eBay monthly. >> >> I heard that

Re: IBM PC Network

> On May 23, 2021, at 5:18 PM, Wayne S wrote: > > ISTR That the 2 main issues hindering wide spread adoption of TR was cost and > and not knowing where TR development was headed. > The Type 1 cabling needed to each port on the hub was expensive vs thick/thin > Ethernet with taps (as were th

Re: Writings on AI from 17 years ago....

> On May 24, 2021, at 4:31 PM, Chris Zach via cctalk > wrote: > > Well if it winds up in the dumpster then that's yet another lesson to not > trust "Museums". It's actually funny than MC was taken from the storage shed > and turned up at another "Museum". > > Oi. > C I've worked with a mu

Re: Writings on AI from 17 years ago....

> On May 24, 2021, at 7:03 PM, Mark Huffstutter via cctalk > wrote: > > If They eventually have a local garage sale I'm going to head down there > With my Explorer and a U-Hump trailer to pick up the CDC 6500... ;>) That would be great! You could get help with that. paul

Re: Writings on AI from 17 years ago....

> On May 25, 2021, at 9:35 AM, Tom Hunter via cctalk > wrote: > > ... > Don't trust that museums will abide by your wishes when you donate an item. At least in the USA, that's true for all museums, and for some insane reason the courts permit them to do this. There are infamous court cases

Re: Writings on AI from 17 years ago....

> On May 25, 2021, at 1:09 PM, Al Kossow via cctalk > wrote: > > On 5/25/21 8:58 AM, William Donzelli via cctalk wrote: >>> I believe that enthusiastic and competent individuals will look after >>> valuable items much better than most museums can. >> As one who does estate cleanups profession

Re: RSTS/E version numbers

> On May 31, 2021, at 8:06 AM, Antonio Carlini via cctalk > wrote: > > Can someone explain RSTS/E version numbers to me? > > They seem to be all over the place: V2A-19, V4A-12, V4B-17, V5A-21, V5B-24, > V5C-01, V6A-02, V6B-02, V6C-03. > > Then it seems to have switched scheme but the "-num

Re: RSTS/E version numbers

> On May 31, 2021, at 10:04 AM, Paul Koning via cctalk > wrote: > > > >> On May 31, 2021, at 8:06 AM, Antonio Carlini via cctalk >> wrote: >> >> Can someone explain RSTS/E version numbers to me? >> >> They seem to be all over the pla

Re: RSTS/E version numbers

> On May 31, 2021, at 1:55 PM, Antonio Carlini wrote: > > On 31/05/2021 15:04, Paul Koning wrote: >> >> The earlier rule was that the first number is the major version, the letter >> is the minor version. As of V7 it changed to major number dot minor number. >> In either case, the dash nu

Re: VAXstation 4000/vlc mouse issue

> On Jun 1, 2021, at 12:27 PM, Zane Healy via cctalk > wrote: > > On May 31, 2021, at 8:08 PM, Zane Healy via cctalk > wrote: >> >> I’m using a VSXXX-AA mouse (Hocky Puck), and when I use the middle-button on >> the mouse, it messes up DECwindows, and I’m no longer able to use the other

Re: BA11 power filter

> On Jun 1, 2021, at 4:16 PM, Steve Maddison via cctalk > wrote: > > After a few years in storage I'm finally getting to play with my PDP-11 > stuff again. Figured I'd start small so rolled out the 11/23. PSU looks > fine, pulled all the cards and checked voltages, no problem. Shortly after >

Re: BA11 power filter

> On Jun 2, 2021, at 6:34 AM, Steve Maddison via cctalk > wrote: > > On Tue, 1 Jun 2021 at 22:38, Paul Koning wrote: >> >> I'm not sure if you're talking about the same sort of device I had trouble >> with, so FYI: the Pro power supply is a box the size of an old-fashioned >> Bible, with

Re: Early Programming Books

> On Jun 20, 2021, at 4:43 AM, Paul Birkel via cctalk > wrote: > > I know of two early computer (in the stored program sense) programming > books. > >1951: Preparation of Programs for an Electronic Digital Computer > (Wilkes, Wheeler, & Gill) > >1957: Digital Computer Programming (M

Re: Early Programming Books

> Begin forwarded message: > > From: Norman Jaffe via cctalk > Subject: Re: Early Programming Books > Date: June 20, 2021 at 10:26:27 AM EDT > To: "General Discussion, On-Topic Posts Only" > Reply-To: Norman Jaffe , "General Discussion: On-Topic and > Off-Topic Posts" > > I have two books

Re: Early Programming Books

> On Jun 20, 2021, at 1:19 PM, Norman Jaffe via cctech > wrote: > > Basically, pre-1960, there couldn't be a 'general book on programming', since > every system was a unique environment - the only languages that could even be > remotely considered to be common were ALGOL 60 and FORTRAN II..

Re: Early Programming Books

> On Jun 21, 2021, at 12:19 AM, ben via cctalk wrote: > > On 2021-06-20 9:01 p.m., Brent Hilpert via cctalk wrote: >> On 2021-Jun-20, at 7:38 PM, ben via cctech wrote: >>> On 2021-06-20 8:13 p.m., Toby Thain via cctech wrote: >>> Tried the Shunting Yard algorithm? But watch out, it was i

Re: Early Programming Books

> On Jun 21, 2021, at 5:23 AM, ben via cctalk wrote: > > ... > I want to transformatiom before full parsing expressions, as a text process. > string "a+(b+c)*c" becomes "((b+c)*c)a+". As an academic exercise that's pretty trivial. But why would you want to do that? Apparently some people t

Re: Early Programming Books

> On Jun 21, 2021, at 5:03 AM, Paul Birkel via cctalk > wrote: > > Well, utility depends on the objective. One that immediately springs to mind > in an era when "computing" had a dearth of practitioners would be to inform > various audiences "what is involved". > > The Dekker (1957) refer

Re: VT100 colors

> On Jun 21, 2021, at 9:48 AM, Antonio Carlini via cctalk > wrote: > > ... > I can't get t mine either but I think they were originally light cream, but > not bright white. That sounds right. > ... > I remember the tube colour being green, I think I remember seeing amber and I > believe t

Re: Early Programming Books

Since the question was asked "where do I find those CWI (MC) reports?"... CWI has a document search, but they don't make it easy to find. Here it is: https://ir.cwi.nl -- I haven't explored all the things it can look for, but it definitely can find documents by words of the title, or by author

Re: Early Programming Books

> On Jun 21, 2021, at 1:53 PM, Van Snyder via cctalk > wrote: > > On Mon, 2021-06-21 at 06:02 -0700, jim stephens via cctalk wrote: >> That 1620 would have been a fantastic addition to their running >> display. Much easier to work on than what it sounds like the 1401 is. >> And with a dup

Re: IBM 1620; was: Early Programming Books

> On Jun 21, 2021, at 2:43 PM, Chuck Guzis via cctalk > wrote: > > On 6/21/21 10:55 AM, Paul Koning via cctalk wrote: >> > memory. Nobody explained why that was a real problem. >> >> Core memory is fairly sensitive to temperature. In the case of the 16

Re: IBM 1620; was: Early Programming Books

> On Jun 21, 2021, at 3:52 PM, Chuck Guzis wrote: > > On 6/21/21 11:53 AM, Paul Koning wrote: > >> Perhaps you were thinking about the CDC 6500 at the late lamented LCM? That >> got some replacement stacks, which was an interesting puzzle because the >> read data connection out of the memo

Re: Early Programming Books

> On Jun 21, 2021, at 11:26 AM, Chuck Guzis via cctalk > wrote: > > On 6/21/21 1:39 AM, ben via cctalk wrote: > >> I have 'borrowed' copy of the Green dragon book. >> The book promotes code generation for a multi register machine. PDP 11, >> PDP 10, IBM 360. "(C) Bell Labs 1979 " I think is

Re: Early Programming Books

> On Jun 21, 2021, at 6:03 PM, Chuck Guzis wrote: > > On 6/21/21 1:13 PM, Paul Koning wrote: >> >> The reason Dijkstra maligned the 1620 is not because of its lack of >> registers but because of its lack of interrupts and inability to save the >> full execution state. > > Somewhere I've go

Re: VT340 Emulation

> On Jun 22, 2021, at 6:32 AM, Grant Taylor via cctalk > wrote: > > On 6/22/21 1:49 AM, emanuel stiebler via cctalk wrote: >> Be careful. The "native" resolution of the vt340 is 800x480 in 4:3 format ... > > 800x480 isn't 4:3 aspect, like VGA 640x480 / SVGA 800x600 / XGA (?) 1024x768. > Bu

Re: VT340 Emulation

> On Jun 22, 2021, at 12:57 PM, Zane Healy wrote: > > > >> On Jun 22, 2021, at 6:19 AM, Paul Koning via cctalk >> wrote: >> >>>> Imagine a Tekronox Emulation on a 4K display ;-) >> >> Like a Tek 4019? I remember seeing those in T

Re: Early Programming Books

> On Jun 22, 2021, at 3:40 PM, ben via cctalk wrote: > > ... > Lisp is evaluated, not compiled from what little I have read. > If I could read the papers (for free) I could know more. > Refal "Recursive functions algorithmic language" from Russia > looks just what I was looking for. Around sin

Re: Early Programming Books

> On Jun 22, 2021, at 5:43 PM, ben via cctech wrote: > > ... > 1965 to 1985 generated most of the new computing languages,operating > systems and ideas. Sadly most of it seems lost source code wise. > Ben. I might push the start of that back to 1955, but apart from that I agree you have a go

Re: Early Programming Books

> On Jun 23, 2021, at 1:17 PM, Lee Courtney via cctalk > wrote: > > "A Purdue professor had a 20-drawer card file of 1620 software. The fire > marshall insisted he had to get rid of it. I understand he gave it to > CHM. Is it still there?" > > Yes. Catalog entry here: > https://www.computerh

Re: On compiling. (Was a way off topic subject)

> On Jun 23, 2021, at 1:22 PM, Stan Sieler via cctalk > wrote: > > Paul K got it right: > "Any language can be interpreted or compiled. For some languages, like > LISP and TECO, interpreting is a rather natural implementation techniques, > while for others (C, ALGOL) compilation is the obvio

Re: On compiling. (Was a way off topic subject)

> On Jun 23, 2021, at 2:44 PM, Chuck Guzis via cctalk > wrote: > > There are the languages that are otherwise nearly impossible to compile. > > Consider SNOBOL4 (although there is a compiled version called SPITBOL, > but without several hard-to-implement features). One can construct > state

Re: On compiling. (Was a way off topic subject)

> On Jun 23, 2021, at 5:02 PM, Chuck Guzis wrote: > > On 6/23/21 1:14 PM, Paul Koning wrote: > >> I don't remember the details at this point, but I assume the "execute TECO >> macro" operation in the Stevens PDP-10 TECO compiler is done in that way. >> And of course these could keep the co

Re: On compiling. (Was a way off topic subject)

Somewhat related to the point of compiling and executing mixed together is a very strange hack I saw in the Electrologica assembler for the X8 (the company issue one, not one of the various ones built at various labs for that machine). It is essentially a "load and go" assembler, so the code is

Re: On compiling. (Was a way off topic subject)

> On Jun 24, 2021, at 1:02 AM, ben via cctalk wrote: > > On 2021-06-23 6:48 p.m., Paul Koning via cctalk wrote: >> Somewhat related to the point of compiling and executing mixed together is a >> very strange hack I saw in the Electrologica assembler for the X8 (the >

Re: VT340 Emulation

> On Jun 24, 2021, at 9:30 AM, Mark Matlock via cctalk > wrote: > > >> On Jun 24, 2021, at 1:25 AM, Zane Healy wrote: >> >> And all this time I thought that I wanted a VT525! How much are the >> VTLAN40’s going for? >> >> Zane > > Zane, >If you explain to Mitch Miller at Keyways t

Re: VT340 Emulation

> On Jun 24, 2021, at 1:07 PM, Al Kossow via cctalk > wrote: > > On 6/24/21 9:06 AM, Paul Koning via cctalk wrote: > >> LK201s use 4800 baud UART interfacing. PC keyboards with DIN connectors >> (PS-2) have a very different type of interface, nothing like a UAR

Re: Interesting photos of a computer graphics lab from 1968

> On Jun 24, 2021, at 1:37 PM, Mike Begley via cctalk > wrote: > > A friend of mine collects old photos, and sent me a link to this set he just > recovered from film. He doesn't know much about the provenance, but it might > be interesting to figure out what we can about them. > > The lin

Re: VT340 Emulation

> On Jun 24, 2021, at 8:51 PM, Grant Taylor via cctalk > wrote: > > On 6/22/21 9:12 AM, Ethan Dicks via cctalk wrote: >> The OP said he meant with "real" connectors, but in my case, I've >> encountered strange buffering issues with USB serial dongles (since they are >> really block-mode dev

Re: VT340 Emulation

> On Jun 25, 2021, at 4:48 AM, Peter Corlett via cctalk > wrote: > > On Thu, Jun 24, 2021 at 06:46:41PM -0600, Grant Taylor via cctalk wrote: > [...] >> The 4k monitors that I've worked with have been ultra high DPI. This means >> that things that don't have DPI settings end up being tiny on

Re: VT340 Emulation

> On Jun 25, 2021, at 10:24 AM, ben via cctalk wrote: > ... > Well you can find mother boards with real COM port, but they are rare. One place you can find them easily is on industrial computers. My firewall machine is one, because I wanted it to be fanless. It has the usual pile of USB po

Re: VT340 Emulation

> On Jun 26, 2021, at 11:31 AM, Tapley, Mark B. via cctalk > wrote: > > At one point FTDI had a reasonably good reputation, and I own one of those > devices based on that reputation. I have used it with no obvious problems > connecting a TRS Color Computer 3 to an iMac G3 for a floppy-drive

Re: VT340 Emulation

> On Jun 26, 2021, at 7:08 PM, Maciej W. Rozycki wrote: > > On Fri, 25 Jun 2021, Paul Koning via cctalk wrote: > >>> Well you can find mother boards with real COM port, but they are rare. >> >> One place you can find them easily is on industrial computers

Re: VT340 Emulation

> On Jun 28, 2021, at 4:23 AM, David Brownlee via cctalk > wrote: > > ... > I noticed this the other day, just in case it's of interest to anyone > on this thread. > > | https://www.tindie.com/products/nsayer/ftdi-be-gone/ > | FTDI-be-gone is a USB-to-serial adapter. ... Rather than use a >

Re: FTGH for pickup in So Cal: PDP-11/44, Macs, Atari ST, RiscPC, ...

> On Jul 6, 2021, at 4:57 PM, Zane Healy via cctalk > wrote: > > On Jul 5, 2021, at 7:30 PM, Cameron Kaiser via cctalk > wrote: >> >> UMAX Astra 2100U flatbed USB scanner with power supply. Powers on. Works >> with classic Mac OS but probably most systems. No driver disc. > > > This shou

Re: OT: SiC Radio for Venus lander

> On Jul 10, 2021, at 8:58 AM, Rodney Brown via cctalk > wrote: > > Alan Mantooth, Carl-Mikael Zetterling and Ana Rusu (28 April 2021) > "The Radio We Could Send to Hell: Silicon carbide radio circuits can take the > volcanic heat of Venus" IEEE Spectrum > https://spectrum.ieee.org/semicondu

TECO

For the TECO fans out there this might be of interest: https://github.com/pkoning2/pyteco paul

Re: Looking for VAX6000 items

> On Jul 13, 2021, at 11:34 PM, Chris Zach via cctalk > wrote: > >> When we got an 8530 at work in the early 90s (needed a machine with a >> Nautilus bus for specific hardware testing), it was definitely a >> 3-phase machine and since we were in an industrial setting, I just >> tapped into ou

Re: Looking for VAX6000 items

> On Jul 14, 2021, at 7:43 AM, Brian Roth via cctalk > wrote: > > > >> Interesting. Were the power supplies 3 phase input? Like you I have >> noticed that most pdp and vax gear just pull 120 volt legs off the 3 >> phase to balance power loads. So you can run them on a couple of 120 >> c

Re: Looking for VAX6000 items

> On Jul 14, 2021, at 12:33 PM, Guy Sotomayor via cctalk > wrote: > > I've found 2 issues w.r.t. "rotary converters". > > * They *always* consume lots of power regardless of the actual load Really? That seems odd. A rotary converter is merely a three phase motor with run capacitors. Jus

Re: Looking for VAX6000 items

> On Jul 14, 2021, at 3:53 PM, Guy Sotomayor wrote: > > > On 7/14/21 9:50 AM, Paul Koning wrote: >> >>> On Jul 14, 2021, at 12:33 PM, Guy Sotomayor via cctalk >>> wrote: >>> >>> I've found 2 issues w.r.t. "rotary converters". >>> >>> * They *always* consume lots of power regardless of th

Re: Koning TECO

Neat. FYI, I just pushed a bugfix and an improvement to color handling. paul > On Jul 15, 2021, at 12:21 AM, Adam Thornton via cctalk > wrote: > > Paul Koning may be pleased to know that his implementation of TECO has > supplanted Blake McBride's TECOC as the standard TECO in the Rubi

Re: Koning TECO

different TECO than I'm used to if 'Color' is > involved... :) > > Cool implementation of it, though. > > Warner > > On Thu, Jul 15, 2021 at 8:38 AM Paul Koning via cctalk <mailto:cctalk@classiccmp.org>> wrote: > Neat. FYI, I just pushed a bugfix and

Re: Looking for VAX6000 items (Paul Koning)

> On Jul 15, 2021, at 4:19 PM, Michael Thompson via cctech > wrote: > >> >> From: Paul Koning >> To: Chris Zach , "cctalk@classiccmp.org" >> >> Subject: Re: Looking for VAX6000 items >> >> A number of the large disk drives use 3 phase motors; RP04/5/6 are >> examples as well. >> >

Re: Looking for VAX6000 items (Paul Koning)

> On Jul 15, 2021, at 4:33 PM, Michael Thompson > wrote: > > The power cord is three-phase, and actually daisy-chains to a second and > third drive. The phases on the AC output connector are rotated to balance the > load on all three phases when three drives are daisy-chained. If you look a

Re: Writings on AI from 17 years ago....

> On Jul 16, 2021, at 3:52 AM, Lars Brinkhoff via cctalk > wrote: > > ... > https://wiki.livingcomputers.org/ That produces a page load error. paul

Re: core matt repair

> On Jul 20, 2021, at 10:04 PM, John Foust via cctalk > wrote: > > At 12:13 PM 7/20/2021, pspan via cctalk wrote: >> I worked at a company called DMA located in Amery Wisconsin during the 80's >> and 90's that did do core mat repair. > > And why were they in Amery, WI - a very small town?

Re: core matt repair

> On Jul 20, 2021, at 8:15 PM, Brent Hilpert via cctech > wrote: > > ... > The development of 3-wire topologies over 4-wire would have helped > automation, or reduced manual effort, considerably. For stringing, the really > awkward aspect of the original 4-wire topology was the sense wire t

Re: Compaq Deskpro boards/hard drives from the late 1990s

> On Jul 21, 2021, at 12:00 PM, Grant Taylor via cctalk > wrote: > > On 7/21/21 3:20 AM, Liam Proven via cctalk wrote: >> ... >> E.g. nobody wants 10base-2 or Thick Ethernet cards much any more. UTP, >> slightly more so: 10base-T, not much, 100base-T somewhat yes. > > Um ... that's not true

Re: core matt repair

> On Jul 21, 2021, at 3:20 PM, Jules Richardson via cctalk > wrote: > > On 7/21/21 9:32 AM, Tom Hunter via cctalk wrote: >> Hi Jos, >> Resoldered how? >> The wires are _very_ thin (I guess 0.1 mm or thinner - think of human hair) > > It's not at all scientific, but I took a photo via a loupe

Re: Reading MT/ST Tapes

One of those magnetic fluid tape checking devices would show the bits very easily at that density (or even a lot higher). It seems to me this sort of thing should be no problem at all for the various general purpose tape reading machines that have been built, especially the ones with MR heads

Re: Skew vs. interleave

> On Jul 30, 2021, at 5:35 PM, Mike Stein via cctalk > wrote: > > There's a small discussion on S100computers about the terms 'skew' and > 'interleave'. > > In CP/M documentation 'skew' refers to what's usually called interleave > these days, i.e. offsetting sectors on a track to compensate

Re: Branching the thread away from Compaq deskpro boards: "What We Have Lost"

> On Aug 1, 2021, at 2:45 PM, ben via cctalk wrote: > > On 2021-08-01 12:32 p.m., Chuck Guzis via cctalk wrote: > >> Would the 68K have succeeded if it were not for Apple and Commodore? >> --Chuck > I suspect if they had the proper virtual memory, it would have been picked > up as a Unix cpu,

Re: Help reading a 9 track tape

> On Aug 2, 2021, at 11:11 AM, James Liu via cctech > wrote: > > Thanks for feedback and offers to assist. I received the tape from > one of the maintainers of Schoonship at CERN, and it was probably made > around 1978 at SLAC. > > For some background, Tini Veltman developed Schoonship in t

Re: Help reading a 9 track tape

> On Aug 2, 2021, at 4:14 PM, Bill Gunshannon via cctalk > wrote: > > On 8/2/21 12:19 PM, Paul Koning via cctalk wrote: >>> On Aug 2, 2021, at 11:11 AM, James Liu via cctech >>> wrote: >>> >>> Thanks for feedback and offers to assist. I r

Re: Help reading a 9 track tape

> On Aug 2, 2021, at 8:45 PM, Chuck Guzis via cctech > wrote: > > On 8/2/21 8:11 AM, James Liu via cctech wrote: >> Thanks for feedback and offers to assist. > > Happy to contirubte. > >> For some background, Tini Veltman developed Schoonship in the 1960's >> at CERN on the CDC 6600. My

Re: Compilers and languages (Was: Help reading a 9 track tape

> On Aug 3, 2021, at 2:44 PM, Chuck Guzis via cctalk > wrote: > > On 8/3/21 9:46 AM, ben via cctalk wrote: > >> Hardware makes software interesting, or is it the other way around? >> With C being developed on a PDP 11, you had no decimal operations, >> but IBM had PL/I that did. Every thing

Re: Help reading a 9 track tape

Perhaps the work could be split up: reading the track waveforms is the one step that requires special hardware (and the skill to handle the tape with minimal damage). Given a collection of recovered waveforms, the data recovery can then be done by anyone. paul > On Aug 5, 2021, at 8:3

Re: Help reading a 9 track tape

> On Aug 5, 2021, at 2:55 PM, Chuck Guzis via cctalk > wrote: > > On 8/5/21 11:20 AM, Jon Elson via cctalk wrote: >> They have air bearing "hubs" that the tape wraps over, and nothing but >> the tape head and cleaner blades touch the oxide side of the tape. But, >> they can still suffer from

Re: Help reading a 9 track tape

> On Aug 5, 2021, at 3:57 PM, Len Shustek via cctalk > wrote: > > > On Aug 5, 2021, at 8:39 AM, Jay Jaeger via cctech > > wrote: > > I know Paul well (we were contemporaries at U. WI). He does not do that > > very often. He did not indicate any issue with a fire at the building that > >

Re: Help reading a 9 track tape

> On Aug 6, 2021, at 1:21 PM, John Foust via cctalk > wrote: > > At 11:45 AM 8/6/2021, Jay Jaeger via cctalk wrote: >> On 8/5/2021 2:57 PM, Len Shustek via cctalk wrote: On Aug 5, 2021, at 8:39 AM, Jay Jaeger via cctech wrote: I know Paul well (we were contemporaries at U. WI

Re: howto bitsavers BASIC-11 v2 disk image under simh

> On Aug 11, 2021, at 7:06 PM, Fritz Mueller via cctalk > wrote: > >> ... > > Ah ha! Thanks much, Glen! > > simh is usually pretty good about padding out attached images, No, I don't think that is true. What is true is that recent versions of SIMH will create full size container files f

Re: How do CRT's age?

I'm a bit confused by the wording. Is the question "how well do they age if not used"? I would say they should last pretty much indefinitely so long as the vacuum seal is correctly made and not cracked, and of course there is no other evidence of mechanical damage. paul > On Aug 13,

Re: Linearizing PDF scans

> On Aug 17, 2021, at 1:47 PM, ED SHARPE via cctalk > wrote: > > but does tumble OVER compress things? Over compress? The normal, and only really valid, practice with black & white documents is lossless compression, where that term has no meaning. There are those who don't understand th

Re: Ultrix-11

I thought V7M and Ultrix were entirely diferent and unrelated things. At least on the Pro, DEC released a betal version of the one (which I tried when it came out) and then canceled it and replaced it by a release of the other. I forgot which came first, other than that the beta was really clun

Re: Ultrix-11

> On Aug 19, 2021, at 4:37 PM, John Forecast via cctalk > wrote: > > >> On Aug 19, 2021, at 9:37 AM, Bill Gunshannon via cctalk >> wrote: >> >> On 8/19/21 12:23 AM, Warner Losh via cctalk wrote: >>> On Wed, Aug 18, 2021 at 10:07 PM Bill Degnan wrote: pretty cool >>> Thanks!

Re: Multiprocessor Qbus PDP-11

> On Aug 19, 2021, at 7:39 PM, Charles Dickman via cctalk > wrote: > > There are indications in the KDJ11-B processor spec on bitsavers that the > M8190 could be used in a multiprocessor configuration. For example, bit 10 > of the Maintenance Register (17 777 750) is labeled "Multiprocessor S

Re: Multiprocessor Qbus PDP-11

> On Aug 20, 2021, at 4:07 PM, Guy Sotomayor via cctalk > wrote: > > There were a couple of other PDP-11 multiprocessors that I know of (and used): > > * C.MMP (eventually 16 PDP-11/40e's in an SMP configuration with a > crosspoint switch accessing a large memory). It ran a capability >

Re: Multiprocessor Qbus PDP-11

> On Aug 20, 2021, at 4:31 PM, John Forecast via cctalk > wrote: > > See: > > > > > for more info on multi-processor PDP-11s including KDJ11-B’s. > > John. Nice. Intere

Re: DEC UNIBUS and use of cassette

> On Aug 21, 2021, at 11:48 PM, Jay Jaeger via cctalk > wrote: > > ... > There were third party cassette systems, typically using some kind of digital > cassette format, that you could hook up with a terminal. One was made by > Sykes that I played with once upon a time: > > http://www.bit

Re: 3d modelling software

I haven't used it for 3d printing work, but from other use I can recommend FreeCAD3d. That is open source software, so free for everyone, not just for "students". It has a GUI, and it can also be scripted using Python, which is a great way to construct very complex models. I've used it to mod

Re: 3d modelling software

tweaking the model). > > alan > >> On Aug 23, 2021, at 09:59, Paul Koning via cctalk >> wrote: >> >> I haven't used it for 3d printing work, but from other use I can recommend >> FreeCAD3d. That is open source software, so free for everyone, not ju

Re: Extremely CISC instructions

> On Aug 23, 2021, at 8:38 PM, Tom Stepleton via cctalk > wrote: > > Hello, > > For the sake of illustration to folks who are not necessarily used to > thinking about what computers do at the machine code level, I'm interested > in collecting examples of single instructions for any CPU archi

Re: Extremely CISC instructions

> On Aug 23, 2021, at 8:38 PM, Tom Stepleton via cctalk > wrote: > > Hello, > > For the sake of illustration to folks who are not necessarily used to > thinking about what computers do at the machine code level, I'm interested > in collecting examples of single instructions for any CPU archi

Re: Extremely CISC instructions

> On Aug 24, 2021, at 6:34 AM, Diane Bruce wrote: > > On Mon, Aug 23, 2021 at 09:09:55PM -0400, Paul Koning via cctalk wrote: >> >> >>> On Aug 23, 2021, at 8:38 PM, Tom Stepleton via cctalk >>> wrote: >>> >>> Hello, >>>

Re: Extremely CISC instructions

> On Aug 24, 2021, at 11:57 AM, Peter Corlett via cctalk > wrote: > > On Tue, Aug 24, 2021 at 08:47:33AM -0500, John Foust via cctalk wrote: >> At 04:13 AM 8/24/2021, Peter Corlett via cctalk wrote: >>> move.b ([0x12345678, %pc, %d0.w*8], 0x9abcdef0), ([0x87654321, %sp], %a0*4, >>> 0x0fedcba

Re: Extremely CISC instructions

Another interesting architecture, not sure if it quite fits your question: the orthogonal computer. You could think of that as vector processor with serial arithmetic -- a cross of a Cray-1 and a PDP-8/S :-) It was invented in the 1960s by William Shooman, and sold for a time by Sanders Associ

Re: Ultrix-11

> On Aug 25, 2021, at 12:04 PM, Douglas Taylor via cctalk > wrote: >> > In the video on youtube and in my experience the screen formating codes seem > to be incorrect. You can see this in the video when a man page is brought > up. The bolding does not occur. I get the same result after i

Re: Extremely CISC instructions

> On Aug 25, 2021, at 2:21 PM, Tony Duell via cctalk > wrote: > > On Wed, Aug 25, 2021 at 7:17 PM Patrick Finnegan via cctalk > wrote: >> >> Landscape monitors work fine as portrait for me when I turn them on their >> side. > > You may have problems converging a colour CRT, particularly an

Re: Extremely CISC instructions- C compilers.

> On Aug 25, 2021, at 2:58 PM, Todd Goodman via cctalk > wrote: > > ... > P.110 of https://walden-family.com/bbn/bbn-print2.pdf has some slight > information. > > It was advertised by Bolt, Beranek and Newman as the first computer to be > designed around the C language. > > It had 10-bit

Re: Ultrix-11

> On Aug 25, 2021, at 4:47 PM, Bill Gunshannon via cctalk > wrote: > > Same thing at the moment. I really don't remember much from the past > as I haven't used Ultrix-11 in several years. I suspect it has > something to do with number of bits and parity. Could be. Since parity always was

Re: Extremely CISC instructions

> On Aug 25, 2021, at 11:41 PM, Tony Duell wrote: > > On Wed, Aug 25, 2021 at 7:47 PM Paul Koning wrote: >> >> >> >>> On Aug 25, 2021, at 2:21 PM, Tony Duell via cctalk >>> wrote: >>> >>> On Wed, Aug 25, 2021 at 7:17 PM Patrick Finnegan via cctalk >>> wrote: Landscape monito

Re: Ultrix-11

> On Aug 26, 2021, at 7:24 AM, Peter Corlett via cctalk > wrote: > > Terminal styling control codes are hit-and-miss even when exclusively using > modern tools. These days, I pretty much exclusively use iTerm2 as my > terminal emulator, which has a bewildering array of compatibility-tweaking

Re: Scanning Suggestions (Bookmarks & Colour)

> On Aug 27, 2021, at 4:50 PM, Antonio Carlini via cctalk > wrote: > > I have a few manuals to scan and I'm looking for suggestions, about how to > add bookmarks and how to handle colour. > ... > For photographs or shaded areas that don't necessarily come out well under > those settings, I

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