test-drb

test-drb@ccmp.vtda.org

101090 discussions

by w9gb＠icloud.com

??Many of the classic Rocker & Lever Actuator switches from the 1960s & 1970s were discontinued, due to industry consolidation (M&A) in 1990s and the convert or obsolete decisions (RoHS compliance), a decade later. This likely means you will need to ?adopt? to current offerings == OR == plow through remaining discontinued surplus parts. For example, Mendelsons only lists about 5% of their Dayton warehouse inventory. https://meci.com/electronics/parts/switches/rocker.html == These Large Actuators are sometimes referred to as Wide Paddles. C&K refers to this PC board mounting as the V3 Style, VERTICAL MOUNT, V-BRACKET It is still offered for the C&K ?T-series? Subminiature Toggle Switches. https://www.mouser.com/datasheet/2/60/ttoggle-1324393.pdf C&K Selector Guide (current production models) http://www1.futureelectronics.com/doc/C%20-%20K%20COMPONENTS/D102J12S115DQA… NKK (Japan) refers to this mounting style as Bracket & Reinforced Bracket for their ?M-series? Miniature Rocker Switches. You purchase the Actuators separately, for the pivot ? like your example. https://www.mouser.com/datasheet/2/295/MrockersSnapin-29723.pdf gb === From: "Charles" <xxxx at centurytel.net> To: "cctalk digest" <cctalk at classiccmp.org> Subject: Looking for front panel switch At some earlier time, I'd either lost (or cannibalized for a PDP-8) one of the switches. Subminiature SPDT toggle switches are readily available >from C&K and Mountain, but I cannot find one with the four-pin mounting bracket and the "ears" to hold the paddle lever pivots. Attached is a picture showing part of the front panel. https://imgur.com/bIrmZt7 Does anyone have a matching switch they're not using? I have a spare black lever, but it's supposed to be blue for that nibble which would be even better ;) Thanks for any help. ==

6 years, 6 months

Looking for front panel switch

by charlesmorris800＠centurytel.net

> https://www.tedss.com/MT-SPDT-7101 Thanks :) It's only slightly different (the mounting pins look to be a bit closer together than my switches dated 1975, but I can drill a couple holes in the PC board, and swap my matching lever onto it.) Certainly a lot closer than the totally non-matching chrome bat handle unit I stuck in there for now! -Charles -- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus

6 years, 6 months

Vintage Computer Warehouse Liquidation

by tsraguso＠gmail.com

This is my first of many posts that I will make about this sale. I am liquidating a large warehouse filled with vintage computers including Apple, DEC, IBM, Commodore, Tandy/Radio Shack, HP, and more. Many items are currently inaccessible due to large piles of junk and video games. So far, I have found: Apple Lisa 2 Tandy 6000 HD IBM 5251 Keyboard MicroVAX 3900 (currently inaccessible) MicroVAX II (currently inaccessible) Cromemco System One Ohio Scientific Challenger 2p Lots of Apple II series IBM 5110 Piles of VT100s Even more VT220, VT320 Northstar Advantage Osborne 1 Various Kaypros PC clones Commodore B-Series Just about every kind of TRS-80 IBM XT with monitor in box NeXT cube Almost every type of Macintosh Amigas IBM PS/2 P70 HP 3000 (inaccessible) 1970s HP computers Boxes filled with Cromemco and Northstar manuals A pallet of 1980s PC clones (inaccessible) Heaps of CRT monitors Mechanical Keyboards At least 20 Apple Extended Keyboard II's I have barely scratched the surface of the warehouse, and will keep you updated when I find more items, or am able to move the large systems. The DEC terminals are not yet for sale, since I have not yet found the keyboards. I am not taking offers on the entire warehouse at this time. Please feel free to text me with questions Thomas Raguso (832) 374-2803

6 years, 6 months

Mystery chip SCM44506L

by wrm＠dW.co.za

Hi all From a friend's estate I have a Motorola 24-pin 0.6" purple ceramic DIP. SCM44506L 7610 B Any idea what this can be? W

6 years, 6 months

Able document at VCF Midwest

by jnc＠mercury.lcs.mit.edu

> From: Christian Corti >> we only have those for the UNIVERTER and QNIVERTER > And what about the stuff on bitsavers? That's where I got my copies of the UNIVERTER and QNIVERTER docs. I guess I missed grabbing a few; and I see a few more have been added since I last looked: http://www.bitsavers.org/pdf/able/ So we also have the Quadrasync, DH/DM, MICROVERTER and UNIMAP. There are still quite a few missing, though... Noel

6 years, 6 months

Looking for front panel switch

by charlesmorris800＠centurytel.net

This fall I decided to restore my first homebrewed computer that I made 40(!) years ago and still have... a 2 MHz 8080A, 1K of static RAM, a 1702A (256 byte) EPROM, cobbled up an S-100 connector for a VB-1B video card, an 8-bit I/O port that used an EBCDIC keyboard (ASCII translation table in the EPROM), and of course a hand-made front panel PC board with blinkenlights & switches. I had a good time learning assembly language (and hand-assembling)... I also toggled in WADUZITDO once or twice. That's a functional interpreted language in 256 bytes plus char in/out routine, for the youngsters ;) I sold the VB-1B years ago, and can't find the keyboard which got lost in a move years ago. So if I want to play with small 8080 programs, I'll need to add a UART (and redo the primitive monitor program for serial I/O instead of memory-mapped display). Recently I bought one of Martin Eberhard's ME-1702A boards with pre-programmed PIC, acquired all the parts from junkbox and Mouser, and just got THAT working. Surprisingly enough, the monitor seems to still have all the right bits after 40 years. Anyway. At some earlier time, I'd either lost (or cannibalized for a PDP-8) one of the switches. Subminiature SPDT toggle switches are readily available >from C&K and Mountain, but I cannot find one with the four-pin mounting bracket and the "ears" to hold the paddle lever pivots. Attached is a picture showing part of the front panel. https://imgur.com/bIrmZt7 Does anyone have a matching switch they're not using? I have a spare black lever, but it's supposed to be blue for that nibble which would be even better ;) Thanks for any help. -- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus

6 years, 7 months

LISP implementations on small machines

by jnc＠mercury.lcs.mit.edu

> From: Eric Smith > Code can be executed from the MMU PAR registers on processors with > 22-bit addressing (11/23, 11/24, 11/44, 11/70, and J-11 based systems). My QBUS machine is apart at the moment, so I can't verify this before posting, but I don't think this hack works on the J-11 machines; I documented this behaviour here: http://gunkies.org/wiki/KDJ11_CPUs#Code_in_PARs It does work with F-11 processors (/23, etc). Not sure about model A F-11's, which only have 18-bit QBUS addressing. Noel

6 years, 7 months

[OT] Looking for a CHEAP Metcal WS1 workstand

by alexandre.tabajara＠gmail.com

Subject says all =) ---8<---Corte aqui---8<--- http://www.tabajara-labs.blogspot.com http://www.tabalabs.com.br ---8<---Corte aqui---8<---

6 years, 7 months

Off topic- precision tooling

by useddec＠gmail.com

I have a sizable quantity or tooling for sale or trade including : circular blades, mostly Levin, 1 1/4 d, 1/4 arbor from .008 to 03 and probably others. drill bits- Levin. 13mm, .0028" etc.and 15 tubes only some labeled, B & D, Cleveland decimal sets, Precision twist and other companies sizes 60 through over 100 or so.. Morris taps and dies, 0-80 through 0000-160, about 20 sizes. Most are new, but a few might be used. If you have any interest, contact me off list. If there enough interest I'll try to make a detailed list. They are a pain for me to work with, but cheap to ship. I also have larger size taps, die , and bits up to 1 1/2 or so, I think a #3 or #4 Morse taper Thanks, Paul

6 years, 7 months

LISP implementations on small machines

by mark.kahrs＠gmail.com

The first implementation was done for the 7090 by McCarthy (hence CAR and CDR --- Contents of Address Register and Contents of Decrement Register). If you want to see a tiny implementation then look for the PDP-1 implementation done by L Peter Deutsch. There's a book chapter and then I found this report: http://s3data.computerhistory.org/pdp-1/DEC.pdp_1.1964.102650371.pdf

6 years, 7 months

SGI Challenge M memory boards

by dennis.grevenstein＠gmail.com

Hi, Jon wrote: > I have 15 pieces of memory SIMMs for the Challenge M series > (funny, seems like there should be an even #). Pics here : > > http://pico-systems.com/images/SGIChallenge.JPG A Challenge M is basically a server variant of an Indigo2. What you have looks like memory for a Challenge L or Onyx. Dennis

6 years, 7 months

Fwd: VAX + Spectre

by paulkoning＠comcast.net

"Spectre" is one of two notorious bugs of modern CPUs involving speculative execution. I rather doubt that VAX is affected by this but I suspect others here have a lot more knowledge. paul > Begin forwarded message: > > From: coypu at sdf.org > Subject: VAX + Spectre > Date: September 17, 2019 at 5:32:42 AM EDT > To: port-vax at netbsd.org > > So, this is a bug report: > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86811 > > GCC would like to know if VAX needs Spectre-related work. > Are any of the VAXes ever made capable of speculative execution? the > first tech for doing it was in 1967, so not entirely far-fetched.

6 years, 7 months

Computer Automation Naked Mini circuit boards

by pontus＠Update.UU.SE

I have a Naked Mini, where are you located? I couldn't see your images.. not sure if my vcfed account is still good. So I don't know what you have. /P On Wed, Oct 02, 2019 at 09:31:09AM +0000, Roland via cctech wrote: > Hello, > I was wondering if anyone has a Computer Automation Naked Mini. > I have these boards and I have no clue what to do with it. So if anyoneis interested please let me know. Pictures are in this vcfed topic: > http://www.vcfed.org/forum/showthread.php?68302-Computer-Automation-Naked-M… interested in swap with omnibus material... > > Regards, Roland

6 years, 7 months

Computer Automation Naked Mini circuit boards

by useddec＠gmail.com

I have two Naked Minis, possible unused, That I would love to find a home for. On Wed, Oct 2, 2019 at 4:31 AM Roland via cctech <cctech at classiccmp.org> wrote: > Hello, > I was wondering if anyone has a Computer Automation Naked Mini. > I have these boards and I have no clue what to do with it. So if anyoneis > interested please let me know. Pictures are in this vcfed topic: > > http://www.vcfed.org/forum/showthread.php?68302-Computer-Automation-Naked-M… > interested in swap with omnibus material... > > Regards, Roland >

6 years, 7 months

Raymond Check discusses MS DOS Floppy Disk Cache

by cliendo＠gmail.com

How did MS-DOS decide that two seconds was the amount of time to keep the floppy disk cache valid? https://devblogs.microsoft.com/oldnewthing/20190924-00/?p=102915

6 years, 7 months

LISP implementations on small machines

by harper＠secureoutcomes-hq.com

Correction!? IBM 704!Jack-----------------------------------------------------Jack HarperSecure Outcomes Inc2942 Evergreen ParkwaySuite 300Evergreen, Colorado 80439303.670.8375 Officewww.secureoutcomesinc.com for Product Info. -------- Original message --------From: Jack Harper <harper at secureoutcomes-hq.com> Date: 10/2/19 13:36 (GMT-07:00) To: Lars Brinkhoff <lars at nocrew.org>, "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org>, Bill Degnan via cctech <cctech at classiccmp.org> Cc: Bill Degnan <billdegnan at gmail.com> Subject: Re: LISP implementations on small machines Hello List -That jives with a conversation I had with John McCarthy before he died.He said that he and friends began the LISP 1.5 (really 1.0) implementation on the IBM 709 - and we both agreed that the idea of LISP running in an enormous pile of vacuum tubes was and is amazing:)Jack-----------------------------------------------------Jack HarperSecure Outcomes Inc2942 Evergreen ParkwaySuite 300Evergreen, Colorado 80439303.670.8375 Officewww.secureoutcomesinc.com for Product Info.-------- Original message --------From: Lars Brinkhoff via cctalk <cctalk at classiccmp.org> Date: 10/2/19 07:42 (GMT-07:00) To: Bill Degnan via cctech <cctech at classiccmp.org> Cc: Bill Degnan <billdegnan at gmail.com> Subject: Re: LISP implementations on small machines Bill Degnan wrote:> First full version 7090 and then a version was ported tot he PDP-1> that was less powerful.? This is straight from the LISP manual on> site.Which LISP manual is that?The LISP I Programmer's Manual from 1960 says IBM 704.? It also says "aversion of LISP I is being prepared for the IBM 709".http://bitsavers.org/pdf/mit/rle_lisp/LISP_I_Programmers_Manual_Mar60.pdf

6 years, 7 months

LISP implementations on small machines

by harper＠secureoutcomes-hq.com

6 years, 7 months

HP vintage boards being sold as scrap

by sales＠elecplus.com

https://www.ebay.com/itm/174036836066 Cindy Croxton Electronics Plus 1613 Water Street Kerrville, TX 78028 830-370-3239 cell sales at elecplus.com --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus

6 years, 7 months

Need DM11 documentation

by jnc＠mercury.lcs.mit.edu

Hi, does anyone out there have any DM11 documentation? The only thing I could find online is the "DM11-BB model control option manual" (DEC-11-HDMBA-A-D) - and it's the impetus for this request, actually. One page 1-5, pg. 15 of the PDF, it has a diagram of which boards go into which slots on the DM11 backplane - and ir has _two_ boards marked M7245! So something's clearly wrong. The DM11 is a fascinating oddball of an interface, BTW. (It's in the 1972 edition of the "peripherals and interfacing handbook".) A lot of its internal state is kept in main memory, and accessed via DMA! This includes the incoming data shift registers!!! So it can really chew up a bus - probably why it was dropped ASAP. I guess when it was done, memory in chips must have been expensive and/or not very dense; and it must have been before the first UART chips. Noel

6 years, 7 months

VCF Midwest 14 Videos

by silent700＠gmail.com

The videos are up! The last of the VCF Midwest 14 Talks videos, shot in glorious 4K and lovingly edited by the intrepid Trixter, have been rendered and posted to our YouTube channel: http://youtube.com/vcfmidwest Check out the Talks you missed this year and in years past, as well as select attendees' videos that we've linked from our page. If you'd like, click the Subscribe button on our profile to let us know you want to see more. Thanks to all those who presented at VCFMW this year and to all that shot video when we were too busy to document our own show. For some of us, it's the only way we see it. 'Til next year... -j

6 years, 7 months

Course materials for MIT 6.031 (c. 1974) scanned

by derschjo＠gmail.com

Thought someone here might find this interesting; I have a binder of materials describing the entire course (descriptions of the PDP-11/45 DELPHI system, readings, coursework, quizzes, exams (with answers)) for MIT 6.031 "Structure and Interpretation of Computer Languages", 1974. http://yahozna.dyndns.org/scratch/scans/mit/MIT%206.031%20Structure%20And%2… It starts with PDP-11 assembly language, moves on to Algol and LISP and is over a thousand pages of material. Get studying! - Josh

6 years, 7 months

Looking for S100 SCP-500C, Disk Master, Seattle Computer Products

by ethan＠757.org

Looking for a SCP-500C Disk Controller to go with my CPU Support and 8086 boards.

6 years, 7 months

phone systems, old and less-old

by jwest＠classiccmp.org

I know some peeps here are phone pholks?..See www.ezwind.net/phonestuff <http://www.ezwind.net/phonestuff> One is an old ?bell system western electric?. It seems to have a few 66 blocks just under the cover, a power supply, and some kind of modules that plug in. The other is a Nortel Networks ICS. It feels way too light, not sure if anything is in it. There is another piece of Nortel gear on the wall, seems to be some kind of wireless? thingy called Nortel Networks Call Pilot 100. I know zilch about phone systems, and don?t want to know anything about phone systems ? They were on the wall of a warehouse telco closet that my client just rented and we need the space on the dmarc wall for a rack. If someone wants them, and is willing to pay ship/pack (ups) from 63146 let me know within 2 days or they go to the skip. J

6 years, 7 months

Course materials for MIT 6.031 (c. 1974) scanned

by jnc＠mercury.lcs.mit.edu

> From: Josh Dersch > Any idea what ultimately happened to that 11/45? MIT offered it to me as a gift, but I was a total idiot (and also didn't have future vision), and as I was so busy with the IETF/IESG at the time (which might have been the right call, given how the Internet - note the correct capitalization - has changed the world) I didn't have time to arrange the shipping, and it was given to FTP Software. I recently tried to track it down, to find all the software on it (before I discovered a couple of sets of dump tapes I had made BITD in my basement), and they gave it to one of their employees and it was apparently scrapped. > Are the Algol and LISP available anywhere? Not up yet, but if anyone wants either, I can try and find time to get them up. For the Algol interpreter, all I have is the binary (runs under the MIT-hacked PWB1 - not sure if it would run until vanilla V6) and the manual; the source was unfortunately not saved when the drives were moved from DSSR/RTS (the DELPHI group) to my group, CSR. (Although there may at one point have been a copy retained on a now long-lost pack, along with a lot of other 6.031 stuff, like problem sets sources; I do have a file which is a listing of the disk contents.) For the LISP interpreter, we do have the source (in MACRO) too. Alas, to build it, one needs the 'bind' binder (which groks .REL files, which are based on DEC's relocatable binary format), which was i) written in BCPL, and ii) the current binary can't rebuild itself (I forget the details, whether it's the BCPL compiler, the MACRO assembler, or 'bind' which can't be re-built; it was a couple of years back I was playing with all that). Luckily, we do have some older binaries which can probably be used to work around the issue. Of course, if one just wants to use the existing interpreter binary, one can avoid all that. Noel

6 years, 7 months

HP vintage boards being sold as scrap - WON

by guykd＠optusnet.com.au

Yesterday: >These will go up on my site at http://everist.org/pics/pcbs Then promptly the web hosting server goes down, since this morning of 20190930 Tue in Australia. I don't yet know why, or have any estimate of when it will come back up. Guy

6 years, 7 months

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