test-drb

test-drb@ccmp.vtda.org

101090 discussions

by fedorkow＠mit.edu

? Al K has read hundreds of these Whirlwind tapes using a standard 8-track optical reader, so I think we can confirm that it is punched with the common geometry, except one track narrower, with four bits on one side of the sprocket holes, and three bits on the other. ? The tapes are for pedagogical purpose, so if I can punch on inch-wide tape and perhaps trim the width later, that works just fine. Thanks all! ?/guy Date: Fri, 26 Mar 2021 16:01:38 -0700 From: Al Kossow <aek at bitsavers.org> To: cctalk at classiccmp.org Subject: Re: punching paper tape Message-ID: <f52af974-dbc4-0a51-409e-b4cc2b9076e9 at bitsavers.org> Content-Type: text/plain; charset=utf-8; format=flowed On 3/26/21 2:58 PM, Steve Malikoff via cctalk wrote: > OK thanks for that. I just had a browse and read that "Whirlwind used > the same paper tape format that was popular with Teletype machines" so > I gather it's nothing special after all. the best picture i have at hand of what a ww tape looks like is on the right of http://bitsavers.org/bits/MIT/whirlwind/X4222.2008_Whirlwind_ptp/pictures/s… you can see it is narrower by one punch than a normal 8-channel tape

5 years

Hard To Believe This Person Is Serious

by robert.jarratt＠ntlworld.com

https://www.ebay.co.uk/itm/313467585213

5 years, 1 month

punching paper tape

by fedorkow＠mit.edu

Is there someone in North America that might be willing and able to help out a small historical display project by punching a few short paper tapes? I'm glad to try to accommodate whatever coding requirements are easiest. Thanks! /guy fedorkow fedorkow at mit.edu

5 years, 1 month

Logic Analyser Usage Advice

by robert.jarratt＠ntlworld.com

I have an old HP 1630G logic analyser. I am trying to use it to debug a problem with an 82C206 peripheral controller (or rather I think damage between the CPU and the peripheral controller). I am not very experienced with logic analysers and I wonder if I am using it correctly. What I am trying to do is see which internal registers are being read/written and the values. To do this there are two signals (XIOR and XIOW) that trigger the read/write on their rising edge. So I have connected the XIOR and XIOW signals to the J and K clock inputs and set the LA to clock on the rising edge. I have then told the LA to trigger on a particular address range (in the State Trace screen if anyone is familiar with this LA). When I run the analyser it complains of a slow clock. This makes sense, because I am using the read/write signals to drive the clock inputs so that I only capture actual reads and writes to the peripheral controller. However, I don't seem to be getting sensible values in the trace and I am wondering if the LA is really not capturing anything because of the slow clock? I don't think it makes sense to clock the LA on the actual clock signal because I won't be able to capture the address and data values on the rising edge of the read/write signals and I would end up with traces full of useless data. Am I doing it right, or is there a technique that I am missing here? Thanks Rob

5 years, 1 month

MaxSpeed VGA MaxStation

by commodorejohn＠gmail.com

So, some months ago, I was in an electronics surplus store and picked up what was obviously an X terminal - tiny metal slab with a VGA connector, serial & parallel, AT keyboard, and RJ45 "communication" port. I got it bare, without the external PSU that would've gone with it, and I've since been unable to determine just what the heck I'm supposed to feed this thing. It's a standard barrel jack, but there's no markings on the case or the PCB to give any clue as to what voltage/amperage or polarity it expects, and Google has been no help at all. Does anyone have any recollection of these things? Any idea what they want for juice? To throw an extra mysterious wrinkle into this, when I popped open the case to get a look at the PCB, I found that, apart from the CPU, DART, and ROM, the only non-glue ICs on the board were an 8K SRAM and a W82C476 RAMDAC - but 8K isn't even remotely enough for a VGA screen, not even a monochrome one at VGA resolution! Am I missing something on how these things operated? Given this, my only guess would be some kind of insane networked-framebuffer scheme where the host would blast video data in on the fly, but there's no way this was even 100Mbps Ethernet, and 10Mbps isn't nearly fast enough to transfer 150KB at 60FPS, and there's no memory to buffer it for a slower refresh. What in the heck is going on here?

5 years, 1 month

seeking docs for Monlithic Systems 303-0158 unibus memory

by fritzm＠fritzm.org

Subject line says it all -- I'm working on a restoration that includes one of these, and it looks as if it needs some troubleshooting/repair. I didn't see docs posted at Bitsavers. Anybody have a manual squirreled away? cheers, --FritzM.

5 years, 1 month

DEC CTI Bus Technical Manual, or looking for Ken Wellsch or Megan Gentry

by bdweb＠mindspring.com

Hello All, Does anyone have a copy of the DEC CTI Bus Technical Manual (EK-00CTI-TM-002) I can scan? If not, does anyone have an email address for Ken Wellsch or Megan Gentry as they both appear to be authorities on the CTI bus (see https://en.wikiversity.org/wiki/DEC_Professional_(computer)/Archive question 10)? Thanks in advance! --Bjoren Davis

5 years, 1 month

VCF Swap Meet in Wall, NJ

by jeffrey＠vcfed.org

Announcing our second Annual Vintage Computer Federation Swap Meet! Last year's Swap Meet was very successful so ... we are doing it again! *DATE*: April 24, 2021 (RAIN DATE: April 25, 2021) *TIME*: 8AM to 2PM *ADDRESS*: Parking Lot on Monmouth Boulevard, Wall, NJ Across from Infoage Museum and Brookdale College *GPS location*: https://goo.gl/maps/m1AAS4UUziGXnoPeA (40.1848793,-74.0630848) *WEBSITE*: http://vcfed.org/wp/vcf-swap-meet *EMAIL*: swapmeet at vcfed.org *PHONE*: 732-722-5015 Free to buyers. Vendor cost is per space. First space is $20, each additional space is $10. You can park in your space and sell out of your vehicle. *SEND PAYMENT TO*: paypal at vcfed.org (FRIENDS AND FAMILY OPTION) Write in the note section: [your name] VCF Swap Meet 4/24/2021 Number of spaces: *SWAP MEET SIGNUP*: https://forms.gle/kNCL8WVxTQcnw5nA6 * Reservation doesn't guarantee sales. * The Vintage Computer Federation is only providing a space, vendors must bring their own tables, tents, cars. * In case of inclement weather, money paid will be refunded. * All items that you bring must be taken with you. No items are to be left behind. * Port-o-potty on site. Jeff Brace ========================================= Vice President & Board Member Vintage Computer Festival East Show-runner Vintage Computer Federation is a 501c3 charity http://www.vcfed.org/

5 years, 1 month

BS was Re: VCF Swap Meet in Wall, NJ (Liam Proven)

by marvin＠west.net

What a bunch of ^%#%#@$^. FYI, this is a listserver designed for classic computer discussions. Please save your diatribes for a more appropriate venue!!! Marvin > Look, TBH, sorry to be That Guy, but what it sounds like is made-up > mumbo-jumbo with as much basis in science as saying his choler is too > low and phlegm and bile out of equilibrium. > > It's an anti-masker trying to justify killing other people. It's no > more valid than a gun nut shouting about the constitution when they've > never been near a "well-organized militia" in their life. > > Keep well away from any people like this in real life. Do not come > into physical contact with them, ever, anywhere. > > -- > Liam Proven ? Profile: https://about.me/liamproven

5 years, 1 month

Any info on a Western Peripherals DC-230 disk controller?

by derschjo＠gmail.com

Any ideas what this disc controller is? https://www.ebay.com/itm/PDP-11-Backplane-Western-Peripherals-DC-230-Disk-C… Can't find much about this on the 'net, other than that it was a controller for Diablo/Pertec style drives -- no idea if it's an RK11 clone or something else entirely. Looks to be suitable for a PDP-11/20 given the little notch missing from the side there, and the lack of a separate power harness for the backplane. - Josh

5 years, 1 month

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