RE: I hate the new mail system

When I hit "reply" I get both the originator's email and the lists email in my 'to' field. I can simply delete the list when I want to only reply to the originator. -Original Message- From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Dennis Boone via cctalk Sent:

RE: Cross-talk square-wave?

There are few things that come to mind here. The op seemed to indicate the lines are terminated. If they are not terminated in the characteristic impedance of the source and the transmission line, it is very unlikely he would be seeing nice square waves at either end. The reflections would

RE: Model 28 Teletypes in Edmonton, Alberta

I might have missed it, but did you offer this on the greenkeys list (or would you like me to forward it?) they are tty enthusiasts. Eugene -Original Message- From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Richard Loken via cctalk Sent: Wednesday, March 29, 2017 6:42

RE: Cross-talk square-wave?

I am still not convinced it is coupling at all. You would expect the affected line to show a signal like dV/dt , no? I just don't think you can get square waves from square waves. That's not to say the input of some logic somewhere isn't getting triggered by unintended coupling and then getting

RE: Cross-talk square-wave?

017 08:48 PM, W2HX via cctalk wrote: > I am still not convinced it is coupling at all. You would expect the affected > line to show a signal like dV/dt , no? I just don't think you can get square > waves from square waves. Yes, you can. The capacitance of typical cables is about 35 pF per f

OT: PCI Ethernet or USB 2.0 ethernet?

Friends, I have an instrument that has an intel motherboard with 400 MHz FSB PCI (not PCI-e). It has a 100 mbps Ethernet card and it would be very useful to get faster networking. The chassis of this instrument is such that I cannot fit a traditional PCI 1GB Ethernet card (I've tried). So I

RE: LGP-30 Update

Impressive progress! Well done! 73 Eugene W2HX -Original Message- From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Cory Heisterkamp via cctalk Sent: Sunday, March 19, 2017 5:40 PM To: General Discussion: On-Topic and Off-Topic Posts Subject: LGP-30 Update Hey guys,

booting os/8

Hi folks, I have a PDP-8/e that I've been working on. I have completed construction of AK6DN's RX01/02 emulator. I got to the step tonight where I was trying to boot an OS/8 disk image and nothing was happening. I realized that I do not have the bootstrap diode board in my 8/e so begin the

RE: Looking for Apollo Workstations for TV show

Please all be careful here. Myself and a friend lent some beautiful Teletype Model 28's ASRs and KSRs with special reperfs, etc. My friend, the real TTY expert, accompanied the machines on set of a TV pilot ("GOOD GIRLS REVOLT "). When they were returned to him, all three of his machines were

RE: In Hong Kong any old computing places to go?

If you ever have the chance to go to HK again, definitely also get your Chinese visa. I used to travel to China and I used to only get 3 and 6 month visas. But in the last year or two, they now grant 10 year visas which I obtained although I have no current plans to visit china. Although I

RE: VCF Midwest: Photos and Videos

Wow. Really impressive meet. congrats -Original Message- From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Jason T via cctalk Sent: Sunday, September 24, 2017 12:05 AM To: General Discussion: On-Topic and Off-Topic Posts Subject: VCF Midwest: Photos and Videos The 12th

RE: Why women were the first computer programmers

Oh, brother. 1955 is calling. -Original Message- From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Rod Smallwood via cctalk Sent: Thursday, August 24, 2017 12:15 AM To: Brian Walenz via cctalk Subject: Re: Why women were the first computer programmers On 24/08/2017

RE: DEC VT 420 comm cable?

to confuse phone and serial cables. Sounds sane, but the MMJs were hard to get a hold of and a real pita in practice. Warner On Fri, Jun 15, 2018 at 3:35 AM, Jonathan Casiot via cctalk < cctalk@classiccmp.org> wrote: > > > On 15/06/2018 03:45, W2HX via cctalk wrote: > >>

DEC VT 420 comm cable?

Hi friends, I just received a refurb'd VT-420 with green screen. I see that I need a special 6 pin/modular-type cable for the comm port. I located the adapter to get to DB25 ( https://www.ebay.com/itm/262041938994 ) but I need the interconnecting cable. Anyone know what it is called? Anyone

RE: old DEC stuff

Dang! I was in Dayton/Xenia also this year and never knew that is where Mitch is located! I have spoken to him on the phone. Very nice guy and very willing to work with hobbyists. Next year I will make a point of meeting him in person and picking up some goodies 73 Eugene W2HX -Original

Re: DEC FPJ11-AA

what is the story about this board? Listing says 11/84 but this website says 8190-AE is for 11/83? http://web.frainresearch.org:8080/projects/pdp-11/dcj11.php Which is it? Thanks Eugene W2HX From: cctalk on behalf of Paul Birkel via cctalk Sent:

RE: TRS-80 Fragmentation

The first personal computer I ever came in contact with was the TRS-80 Model 1 (Level II) at a friend of my father's in Long Island around 1979. I learned to program basic at his house and practiced during the summer at my junior high school that had a few Model 1's for kids to work with. The

RE: eBay search fail

I search only for "PDP" (not -11) but I filter on category "Computers/tablets & Networking." It might not have shown up in your search if you searching in "Vintage Computing" category. This one looks like it wasn't listed there -Original Message- From: cctalk

question on hp9000/310

Hello friends, I am totally ignorant about hp9000 machines. I am considering acquiring this machine for fun and learning about the 9000. It has a 9153A and 9134D with other accessories. The system currently boots up to BASIC 4.0 I have read that this machine can also support HP/UX. Can anyone

Re: RK05 spindle pulleys - trade 50Hz vs 60Hz?

That is not the whole story of 400Hz. The other part of that story is that now, all of the downstream equipment that uses the 400 Hz can have much simpler AC to DC power supplies in them. At 400 Hz it is much easier to regulate and filter out ripple. So instead of every piece of equipment each

Re: German Translation, Serial Port?

>> wrote: On 08/09/2018 09:39 PM, W2HX via cctalk wrote: > Hello friends. I need a translation from a German manual describing serial > port parameters. I used google translate but it doesn't quite give me the > warm and fuzzy. Anyone here speak German? Here is what it says:

Re: German Translation, Serial Port?

thanks everyone! From: Paul Koning Sent: Friday, August 10, 2018 9:22 AM To: W2HX; General Discussion: On-Topic and Off-Topic Posts Subject: Re: German Translation, Serial Port? > On Aug 9, 2018, at 9:39 PM, W2HX via cctalk wrote: > > Hello f

RE: Help ID'ing Bridge Rectifier

I agree with chuck. 73 Eugene W2HX -Original Message- From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Chuck Guzis via cctalk Sent: Sunday, August 12, 2018 7:16 PM To: Josh Dersch via cctalk Subject: Re: Help ID'ing Bridge Rectifier I would think, looking at the

German Translation, Serial Port?

Hello friends. I need a translation from a German manual describing serial port parameters. I used google translate but it doesn't quite give me the warm and fuzzy. Anyone here speak German? Here is what it says: Betriebsart: Asynchron 16 Zeichenlänge: 7 bit (mit Sperrschritt) Parity: gerade

TRS-80 floppy

Not mine, just thought it might interest some here https://www.ebay.com/itm/202376723756 73 Eugene W2HX

Re: RL Drive Terminators

I just bought one for about $28. That seemed reasonable to me. Enough to not bother to build it. 73 Eugene W2HX From: cctalk on behalf of Bill Gunshannon via cctalk Sent: Friday, April 20, 2018 9:24

Digilog DLM III?

Hi friends. Looking for a user manual (or anything) for this data line monitor. Here is a picture: http://w2hx.com/x/Digilog/Digilog-DLM-III.jpg Thanks

8085 Dissasembly?

Hi friends. I have a 1990's vintage commercial radio system that uses an 80C85A CPU. I am looking to hopefully modify the firmware to make some small changes in its behavior. The firmware is contained in two EPROMS. Can anyone recommend a decent disassembler to use with this? Preferably

RE: Digilog DLM III?

, Jonathan On Sat, Apr 21, 2018 at 12:07 AM, Ethan Dicks via cctalk < cctalk@classiccmp.org> wrote: > On Fri, Apr 20, 2018 at 11:21 PM, W2HX via cctalk > <cctalk@classiccmp.org> > wrote: > > Hi friends. Looking for a user manual (or anything) for this data > > l

RE: 8085 Dissasembly?

Hi Glen, Allison, Jonathan, Chuck, et. al. Thanks everyone for the suggestions. I investigated the IDA Pro and unfortunately, the freeware version does not support 8085 and their lowest tier version costs $700 (ouch), but I will look into others like DASMx. In case anyone is interested in the

Re: VAX 9440

plus one for the hakko 808. Love it! Never leave home without it! From: cctalk on behalf of Ethan via cctalk Sent: Monday, November 12, 2018 9:34 AM To: Eric Smith; General Discussion: On-Topic and Off-Topic Posts Subject: Re: VAX 9440 > > Some people

WTD: 9 track open reel for PDP-11

Hi friends, I've been building up a nice little PDP-11/23+ with cabinets, RL02's etc. To really round things off, I'm looking for a open reel-to-reel style 9-track tape drive to add to the system (don't ask why, punishment must be somewhere in my nature). Not interested in the

RE: Vintage Radio Catalogs

http://mailman.qth.net/mailman/listinfo/boatanchors might be good. 73 Eugene W2HX -Original Message- From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Columbia Valley Maker Space via cctalk Sent: Friday, December 21, 2018 6:54 PM To: cctalk@classiccmp.org Subject:

RE: Teletype cheap

The guru of ASR33s is WAYNE KB1FDW, teletypepa...@comcast.net sales, repairs, advice. 73 Eugene W2HX -Original Message- From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of steve shumaker via cctalk Sent: Wednesday, November 21, 2018 6:16 PM To: General Discussion:

Re: OT: Phone museum seeks new owner

I found this link from forbes on this issue. Apologies in advance as this site has lots of ads on it, but it is forbes.com https://www.forbes.com/sites/forbestechcouncil/2017/12/04/yes-the-gdpr-will-affect-your-u-s-based-business/#4fb0c03d6ff2 From:

Re: POP-2 silver book

Amazing! I saw POP and I recognized it. I used to work for Professor Robin Popplestone while I was at UMASS Amherst working in their "laboratory for perceptual robotics" around 1988-89. He was quite a character! Died some years ago I heard. Interestingly, he never attained his PHd. Rumor was

Re: Fujitsi 2444AC 9-track tape drive/PDP-11

tape drive/PDP-11 On 3/19/19 8:26 AM, Jon Elson via cctalk wrote: > On 03/18/2019 10:35 PM, W2HX via cctalk wrote: >> 4. Anyone ever make a pertec to USB project? Might be interesting >> to get access to old tapes on more modern computers? >> >> > I have some CDC

Fujitsi 2444AC 9-track tape drive/PDP-11

Hello friends, I recently acquired a NIB 9-track for use in my (someday to be operational) PDP-11/23+ or PDP-11/73 (I've lost track of the details). I got it on ebay for $150 but the shipping from CA to NY was not insubstantial :). The ebay ad showed a well-used unit but when it arrived it

Re: TeleVideo's MmmOST

fascinatingly advanced for 1981. From: cctalk on behalf of Patrick Finnegan via cctalk Sent: Wednesday, April 10, 2019 4:50 PM To: General Discussion: On-Topic and Off-Topic Posts Subject: TeleVideo's MmmOST I've been adding a few more blog posts, and

Re: Fujitsi 2444AC 9-track tape drive/PDP-11

. From: cctalk on behalf of Glen Slick via cctalk Sent: Thursday, April 11, 2019 9:10 PM To: General Discussion: On-Topic and Off-Topic Posts Subject: Re: Fujitsi 2444AC 9-track tape drive/PDP-11 On Thu, Apr 11, 2019 at 5:55 PM W2HX via cctalk wrote

Re: Control Console, but not PDP-10

And don't forget about the 25% buyer's premium! Wow From: cctalk on behalf of Ethan Dicks via cctalk Sent: Friday, April 12, 2019 1:59 AM To: Paul Birkel; General Discussion: On-Topic and Off-Topic Posts Subject: Re: Control Console, but not PDP-10 On

PDP-11/83 w/FPU?

?Hi friends. I am putting together a PDP-11 set up. i have a few CPUs available to me, a 11/23+, an 11/73 and I also have available to me an 11/83, M8190-AE . I would like to try to run as many different OS's as may interest me, including some unixes as possible (bsd...etc). My question is,

Re: 11/93 Rebuild

I would love it if anyone on this list who maintains a wiki for PDP-11's could collect all of the various methods and instructions. I am still far from ready to do things like this (moving images to a PDP) but it is in my future. I could go through all the emails in the archive on the subject

Re: Uniprobe

I hope the creator of the uniprobe will someday create a Q probe! From: cctalk on behalf of Jim Manley via cctalk Sent: Saturday, June 1, 2019 2:35 AM To: marc.how...@ieee.org; Marc Howard; General Discussion: On-Topic and Off-Topic Posts Subject: Re:

RE: apollo psa test point adaptor

21, 2019 at 12:31 PM W2HX via cctalk wrote: > > > >BTW I got my Apollo IRIG at the same auction that Adrian got the Apollo PSA > >tester from. > > Wow, didn't know that NASA had testers for prostate specific antigen! They use them when exploring Uranus.

Re: DEC disc pack inspection unit on eBay

What is this used for? RL02's or something? and what does it do? From: cctalk on behalf of Bob Rosenbloom via cctalk Sent: Friday, May 10, 2019 1:49 AM To: cctalk Subject: DEC disc pack inspection unit on eBay There's a mis-categorized disk pack

Re: apollo psa test point adaptor

>BTW I got my Apollo IRIG at the same auction that Adrian got the Apollo PSA >tester from. Wow, didn't know that NASA had testers for prostate specific antigen!

RE: Fujitsi 2444AC 9-track tape drive/PDP-11

-Original Message- From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Glen Slick via cctalk Sent: Tuesday, March 19, 2019 12:41 AM To: General Discussion: On-Topic and Off-Topic Posts Subject: Re: Fujitsi 2444AC 9-track tape drive/PDP-11 On Mon, Mar 18, 2019 at 8:35 PM W2HX via

RE: Fujitsi 2444AC 9-track tape drive/PDP-11

Oh, oops. That went completely over my head. I missed that detail entirely. We'll keep our fingers crossed that this will work :( 73 Eugene W2HX -Original Message- From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Dennis Boone via cctalk Sent: Wednesday, May 01, 2019

Re: Fujitsi 2444AC 9-track tape drive/PDP-11

>>But plain old flat straight ribbon cable in a 10" length will do for the 2444; even at 6250, frequencies aren't much higher than 1MH Sounds like I might be ok. Except mine are 10 feet not inches! I guess I'll just have to try them out. Thanks everyone!

RL01 Platter Removal?

?Hi all, I have a crashed RL01 disk (very crashed). I'd like to remove it from the plastic cover to display it. I opened up the case but cannot figure out how to remove the platter? I took 4 philips screws out which only served to remove a metal ring. It seems that the handle is somehow

Re: Fujitsi 2444AC 9-track tape drive/PDP-11

-track tape drive/PDP-11 On Mon, Mar 18, 2019 at 8:35 PM W2HX via cctalk wrote: > > Now for some questions. > > 1. I've been told the QT13 is a very good card to interface here. I've > been looking for a while on ebay without luck. I do see a QT14 on ebay right > now at a

Re: Pertec Interface Cable Length

>All of my Pertec tape drives (in the past) were located in a differentrack from the actual computer so the cables were always over 10' long and usually close to if not 20'. Never had a problem. That is because a) you had the proper termination in place and b) the signalling speed of the

Re: Pertec Interface Cable Length

>Would folding the excess cable up and covering with anti-static plastic help? unlikely. The typical problem is that the longer the cable, the higher the capacitance of the transmission line. Therefore you get a lot of problems with rising and trailing edges of the signals which can cause all

Re: TRS-80 Fireworks

Be sure to read this article. The caps used in this capacity (pun intended) are specialized... https://www.allaboutcircuits.com/technical-articles/safety-capacitor-class-x-and-class-y-capacitors/ From: cctalk on behalf of Marvin Johnston via cctalk

DEC MS630/M7609 Question

Hi there. I just acquired a board with the number M7609. It was advertised as an M630-CA which my research tells me is supposed to be 16MB. How do I tell on the board if this is 8MB or 16MB? There does not seem to be a suffix on the board that I can see. What to look for? 73 Eugene W2HX

Re: DEC MS630/M7609 Question

Thanks, Lyle. I was reading this. I guess its wrong? https://en.wikipedia.org/wiki/MicroVAX The MS630 memory expansion module was used for expanding memory capacity. Four variants of the MS630 existed: the 1 MB MS630-AA, 2 MB MS630-BA, 4 MB MS630-BB and the 16MB MS630-CA. Wouldn't be the

Re: UniBone: Linux-to-DEC-UNIBUS-bridge, year #1

LOVE the ideas, loved it when I first heard of it. But I'm a QBUS guy! Put me on the list when (if) you ever make one for qbus. GREAT idea! Eugene From: cctalk on behalf of Jörg Hoppe via cctalk Sent: Friday, November 15, 2019 8:07 AM To: General

Re: UniBone: Linux-to-DEC-UNIBUS-bridge, year #1

amongst us de Nigel ve3id On 15/11/2019 15:23, David Bridgham via cctalk wrote: > On 11/15/19 3:01 PM, W2HX via cctalk wrote: >> LOVE the ideas, loved it when I first heard of it. But I'm a QBUS guy! Put >> me on the list when (if) you ever make one for qbus. GREAT idea! >> Eugene

Re: DEC KA650 VAX memory troubleshooting

Wow. Very nicely done! Which logic analyzer did you use to capture those displays? 73 Eugene W2HX From: cctalk on behalf of Joseph Zatarski via cctalk Sent: Sunday, November 24, 2019 1:28 AM To: General Discussion: On-Topic Posts Subject: Re: DEC KA650

Re: First Internet message

software is currently non-patentable. Not sure the order of when it was/wasnt but currently is not. From: cctalk on behalf of Paul Koning via cctalk Sent: Thursday, December 26, 2019 5:09 PM To: Fred Cisin; General Discussion: On-Topic and Off-Topic

RE: State of New Jersey needs COBOL programmers

Not sure about that. I worked for Pershing in Jersey City around that time. They were (are?) a clearing house for tens of millions of dollars' worth of stock and bond trades every day. Lots of cobol to be remediated still in 1999. Oh, and I also worked on decimalization (stocks used to be

VAX 11-780 Rack Available

Hi friends. This rack is available for free. I am located in 10510 happy to drive, up to say 1.5 hours to meet up to transfer vehicles? https://w2hx.com/ForSale/DEC%20Rack/20200719_114742.jpg https://w2hx.com/ForSale/DEC%20Rack/20200719_114751.jpg it is in very nice condition. Comes with

article on TRS-80 in Nuts and Volts

Don't know if anyone gets/reads this old rag but I thought I'd share an article I came across: https://www.nutsvolts.com/magazine/article/the-trs-80-model-1 73 Eugene W2HX

RE: [HECnet] RSTS/E patches

Are these patches discussed below only for patching SIMH to fix problems with it? Or are these fixes that are for actual PDP hardware implementations of RSTS? -Original Message- From: cctalk On Behalf Of Tony Nicholson via cctalk Sent: Monday, September 14, 2020 6:10 PM To:

RE: IDE-SD adapter question

Discussion: On-Topic and Off-Topic Posts Cc: cct...@classiccmp.org Subject: Re: IDE-SD adapter question Hi Eugene, On Fri, Jun 26, 2020 at 09:39:57PM +, W2HX via cctalk wrote: > Hi all, > However, I do get errors "sector not found" and if I A)bort I get INT 24 > error.

IDE Hard Drive Question

Hi friends, Sorry for the long email that follows: I am working with an old military PC model SAIC V2LC. The PC is a 486 and is from around 1992 give or take a couple of years. Probably 1995 latest. The computer has one 3.5" floppy and a removable IDE hard drive in a removable carrier. It

RE: IDE-SD adapter question

Could it be related to the fact that it is a 2GB SD card and I believe IDE controllers of that day could only address something like 500MB? Should I consider trying to partition the SD card into a 500MB partition? Eugene From: Richard Cini Sent: Friday, June 26, 2020 6:08 PM To: W2HX ;

IDE-SD adapter question

Hi all, Thanks for previous help on this project. I am working on an old 486 computer and I have replaced a 40 pin IDE hard drive with this SD adapter... https://www.amazon.com/gp/product/B07G29TZPS/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8=1 In general it seems to mostly be working. I can see

RE: IDE Hard Drive Question

Thank you EVERYONE. Yes I confirmed that the red disc is a heater and the little device on the side is a temp sensor. All is good. I will send a new email out with some new questions but wanted to tie off this discussion with thanks to all Eugene -Original Message- From: cctalk On

RE: IDE-SD adapter question

Peter and Maciej. Thank you very much for the input. I don't believe this BIOS supports anything other than CHS. At least I don't see a way to toggle between CHS and LBA. Is this what I should be looking for? An option to enable LBA mode? I am not opposed to going to CF, but I have no other

RE: Apple 1 and memorabilia up for auction in Boston (NOT on Epay)

What am I missing? The picture shown on RR auctions shows the board with no chips? -Original Message- From: cctalk On Behalf Of Adrian Stoness via cctalk Sent: Thursday, December 10, 2020 10:32 PM To: Ali ; General Discussion: On-Topic and Off-Topic Posts Subject: Re: Apple 1 and

RE: Soldering DB connectors

Crimp pins 100%! -Original Message- From: cctalk On Behalf Of Chuck Guzis via cctalk Sent: Wednesday, November 11, 2020 8:11 PM To: dwight via cctalk Subject: Re: Soldering DB connectors On 11/11/20 2:19 PM, dwight via cctalk wrote: > I've not had issues just soldering the wires on.

neat VGA tester

For you folks that work on machines with VGA monitors. https://www.mpja.com/11-16-20.asp?r=344017=2 I don't own one but it seemed interesting enough to pass on. 73 Eugene W2HX

RE: 400 Hz

I will add that aircraft are one of the main users of 400 Hz. This is because weight is always an critical design consideration. So with smaller transformers, smaller capacitors, etc, you can save a LOT of weight on electronic devices in an aircraft. 73 Eugene W2HX -Original Message-

RE: DEC PDP-8/e Omnibus backplane lubrication

I would use caig deoxit. They have a version that has lubrication properties. I think it is the "S" series. Eugene -Original Message- From: cctalk On Behalf Of Tom Hunter via cctalk Sent: Monday, May 10, 2021 11:14 PM To: General Discussion: On-Topic and Off-Topic Posts Subject: DEC

RE: DEC PDP-8/e Omnibus backplane lubrication

Ok, good article. From what I read, there are some things it doesn’t do. Author states "What it will not do. IT WILL NOT REMOVE RUST. IT WILL NOT REMOVE OXIDATION" cool beans. He also states that it isn’t as good as military products for aluminum salt fog. I hope the Op wasn’t planning to use

RE: DEC PDP-8/e Omnibus backplane lubrication

Very interesting. In probably 30 years I've been repairing equipment and among the dozen or so electronics forums I belong to, you may be the first person I've run across to throw some shade on that product. I've never heard any concerns or warnings about it. And there are some rather reputable

RE: cctalk Digest, Vol 76, Issue 29

> I can still count quite rapidly up to 31 on one hand (either one). That is a neat trick. I have a hard time counting to 21 unless I take off my pants. 73 Eugene W2HX -Original Message- From: cctalk On Behalf Of Mark Moulding via cctalk Sent: Saturday, January 30, 2021 3:45 PM To:

RE: VAX 780 on eBay

> True. But if you're trying to get > $5000 for something, it doesn't seem unreasonable to suggest that investing a bit in getting an extension cord run to the location of the machine would be a good idea. The absence of that effort makes me wonder if the owner knows what the outcome of such

RE: VAX 780 on eBay

The other benefit to 3phase power to something like a computer is that the filter caps required can be much smaller. Once you rectify three phases 60* you get MUCH less ripple because every 60 degrees you have a new peak arriving. When you have a real gas (electron) guzzler like one of these,

RE: Apple I auction

Anyone know what this sold for? 73 Eugene W2HX Subscribe to my Youtube Channel: https://www.youtube.com/c/w2hx-channel/videos -Original Message- From: cctalk On Behalf Of s shumaker via cctalk Sent: Friday, October 22, 2021 9:07 PM To: General Discussion: On-Topic and Off-Topic Posts

RE: DEC 3000/600 Alphaserver problems

A bad tant will show 0V across it and it will show 0V (or very close to it) across all the other tants used as filter caps on that same rail. I would turn it back on and measure all of your rails. See which is affected. Then pull out every card in the system that uses that rail (probably all

RE: Found! Ge 115 computer brochure

Here is some Baudot Art. Hot off the model 28 73 Eugene W2HX Subscribe to my Youtube Channel: https://www.youtube.com/c/w2hx-channel/videos -Original Message- From: cctalk On Behalf Of Fred Cisin via cctalk Sent: Sunday, March 13, 2022 5:33 PM To: General Discussion: On-Topic and

RE: Found! Ge 115 computer brochure

Well, I made the error thinking an email reflector full of very high tech people (discussing vintage computers) would not support attached images in 2021. Ok, so here is the picture as a link. I'll be curious to see if this reflector allows links or strips them.

RE: Found! Ge 115 computer brochure

Btw I have since resent the message with a link to the .jpg but I don't think it has come through. I suspect both images and links may be verboten on this list. Ironic considering the advanced technical proclivities of the membership! 73 Eugene W2HX Subscribe to my Youtube Channel:

RE: LSSM is chasing this, was Re: General Data? Computer

> For a number of years they had on display the world's oldest broadcast > transmitter, an FM transmitter from 1919 invented in The Hague by Hanso > Idzerda. Interesting as that would have predated the invention of FM by Edwin Howard Armstrong in 1933 (or at least what we thought was the

RE: Rack Discussion Continued - Slide lubricant

> then grease them with light, white lithium grease. Fully agree! 73 Eugene W2HX Subscribe to my Youtube Channel: https://www.youtube.com/c/w2hx-channel/videos

RE: Source for replacement caps in H744 regulators

My 2c. I am not familiar with a "whine" but certainly a "hum." Sometimes if a power supply has seen a lot of heavy load over its lifetime, the heat generated can begin to do things to the transformer. And once that heat has done its "thing" to the transformer, it stays that way. And no

RE: Testing H745 Regulators

Any chance you have a second supply you can parallel with the one you're using? Some bench supplies are dual supplies and have a parallel mode so you can benefit from both sides of the supply and they can track the same voltage. Or just put two supplies in parallel with the same voltage set on

RE: Retro networking / WAN communities

Internet message processor (BBN I think) 73 Eugene W2HX Subscribe to my Youtube Channel: https://www.youtube.com/c/w2hx-channel/videos -Original Message- From: cctech On Behalf Of Wayne S via cctech Sent: Tuesday, April 12, 2022 1:24 PM To: Grant Taylor Cc: General Discussion:

RE: Retro networking / WAN communities

I could be wrong, but I always thought the distinction between hub and bridge was, all traffic is broadcast to all ports on a hub. A bridge allows traffic to be segregated (albeit still on the same subnet). 73 Eugene W2HX Subscribe to my Youtube Channel:

RE: Advice on Desoldering an IC

I would not attempt any desoldering without my hakko 808. I never leave home with out it. While you are sucking and heating the pin, wiggle the pin and it work great. I've desoldered 40 pin chips without trouble, they drop right out of the board. I desoldered this 40 pin chip from a working

RE: Advice on Desoldering an IC

Just be careful around cerroblend. According to Wikipedia... "... is a metal alloy that is useful for soldering and making custom metal parts, but which is toxic to touch or breathe vapors from." "...is toxic because it contains lead and cadmium, and contamination of bare skin is considered

[cctalk] Silly question about S-100 and video monitors

Hi all, I recently acquired an S-100 computer, and it came with a video card and a keyboard (3rd party products, not originally equipped with these). I am trying to figure out the benefits of having a video card and keyboard vs just using a serial port and terminal. Certainly if the video card

[cctalk] Re: Silly question about S-100 and video monitors

board, RF modulator and a parallel keyboard were much cheaper than any serial terminal back then. The RF modulator was separate from the video board (usually hung on the back of the TV) for noise reasons. -Original Message- From: W2HX via cctalk [mailto:cctalk@classiccmp.org] Sent:

[cctalk] Re: Logic Analyzers - HP/Agilent 16700B or 1670G?

Or this looks cool http://www.retrocmp.com/tools/qprobe/327-qprobe2023-overview 73 Eugene W2HX Subscribe to my Youtube Channel: https://www.youtube.com/@w2hx/videos -Original Message- From: Martin Bishop via cctalk Sent: Sunday, August 20, 2023 4:42 PM To: General Discussion:

RE: Advice on Desoldering an IC

Indeed! Great investment. 73 Eugene W2HX Subscribe to my Youtube Channel: https://www.youtube.com/c/w2hx-channel/videos -Original Message- From: cctalk On Behalf Of Rob Jarratt via cctalk Sent: Friday, April 22, 2022 2:04 PM To: 'General Discussion: On-Topic and Off-Topic Posts'

RE: new Z80 monitor ROM works with no RAM

Dang! That Z80 computer looks AWESOME. Is there a website that talks about it? Is this a homebrew project or something he plans to make available as a kit? 73 Eugene W2HX Subscribe to my Youtube Channel: https://www.youtube.com/c/w2hx-channel/videos -Original Message- From: cctalk On

[cctalk] Re: Wang bar napkin story [WAS:RE: Re: "Revival" of a dedicated Micropolis webpage on internet]

I always thought it was interesting how 5 1/4 is 3U (rack units). I thought there might have been some relationship to that. But could have been just coincidence. 73 Eugene W2HX Subscribe to my Youtube Channel: https://www.youtube.com/c/w2hx-channel/videos -Original Message- From: Tom

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