test-drb

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101090 discussions

dfitoimd: decoding Intel M2FM floppy flux images (was Re: Intel 432 floppy flux images for decoding)

by spacewar＠gmail.com

Because the cwtool support for Intel M2FM floppy disk flux images isn't publicly available, I've written a crude Python 3 program for converting such images (in DFI format) to ImageDisk images, and put it on github: https://github.com/brouhaha/dfitoimd My ADPLL data separator has parameters to control the proportions of frequency adjustment and instantaneous phase adjustment that are done at each flux transition. I've experimented with the parameters quite a bit, but it's still not good enough to reliably recover all sectors >from the disk images that started this thread. The default parameters are currently 0.5% frequency adjustment and 10% instantaneous phase adjustment. I was actually fairly surprised that I didn't get better results with more frequency adjustment and less instantaneous phase adjustment. It's entirely possible that my algorithm isn't very good. The code can handle normal IBM 3740 single-density FM format as well, though there are other published programs that already do that. There's a start at code for IBM System/34 double-density MFM format also, but it hasn't been tested at all as I don't happen to have any suitable DFI images. The dfitoimd program is quite slow; on a typical Intel M2FM image with two revolutions per track and 25 MHz sampling, it takes 64 seconds on a 4.0 GHz AMD CPU. I'm pretty sure that rewriting it in C/C++/C# or the like would make it much faster, but I specifically chose Python as I find it easier to experiment with the algorithms.

10 years, 1 month

Atlanta Open House tomorrow!!

by jwest＠classiccmp.org

I'm posting this on behalf of Cindy at Elecplus I can't post to cctalk when I am away from home. I am in Atlanta, and the owner of the warehouse hs agreed to let people come in tomorrow. Please can you post the following for me? First come first served, no shipping on the really cheap items. Model M 101/103 terminal keyboards $10 each, no cracked cases, may not have complete caps. Hundreds of keyboards for other terminals starting at $30 each, tested and complete. A full pallet of AEK 1 and 2 keyboards More expensive items include a Burroughs keyboard, complete and in good condition, a 1978 terminal in working condition, and the following terminals/keyboards, tested, no screen burn, keyboards are complete. DEC VT100 (no keyboards), 220, 320, 420.Wyse 50 and 60 with keyboards. Qume 62 and 101+ with keyboards.Link MC2 and 3 with keyboards. ADDS 4000 with keyboards. HP 700/22, 700/43, 700/60, 700/90, 700/92, 700/94, 700/96 with keyboards. LOTS of working vintage test equip. Some pics are here: <https://drive.google.com/open?id=0BxqLDyoLYuCKbkEwdmlST2lKaUU> https://drive.google.com/open?id=0BxqLDyoLYuCKbkEwdmlST2lKaUU Thank you! Cindy

10 years, 1 month

HP 110 AC Adapter

by COURYHOUSE＠aol.com

and with the right hil interface card can be used with hp-150 also. Ed# _www.smecc.org_ (http://www.smecc.org) In a message dated 8/10/2016 1:56:14 P.M. US Mountain Standard Time, Thanks (and thanks also to Rik for his input). The appropriate adapter is reasonably cheap on eBay ($20 with shipping) so I have one on its way. I've wanted an HP 110 for awhile (but never went out of my way to get one) so this should be fun to play with. And the 9114 drive that came with it can also be used with my HP-75, so that'll be cool as well. Thanks for the tips! - Josh

10 years, 1 month

HP 110 AC Adapter

by Martin.Hepperle＠MH-AeroTools.de

Josh, for testing you can also remove the battery and connect a 6V DC power supply to the computer. Under the battery cover there is also a picofuse which may be blown if someone was tinkering with the machine before. The HP 110 is interesting if you want to play with HP-IL - it has some BIOS routines to control the HP-IL. The other remarkable thing is that he has MS-DOS in ROM and all data on RAM disks m(which is rather limited, though). Ideally you would also want a 9114 3-1/2" floppy disk drive for it. If the computer works, you can rebuild the battery pack. The lead cells are still available e.g. under the name Hawker Enersys Cyclone 2V/2.5Ah. You can use 3 single cells (about 7$ each) and make them into a pack. Good luck Martin

10 years, 1 month

the value of old test and repair equipment

by sales＠elecplus.com

I had to pass up a large qty of old test equip at the recycler last time because they wanted too much for it. For instance, an old HP signal generator would have cost me $25, with no way to test it, and no guarantees that it was complete or working. So my question is, does as-is old test and repair equip that won't be particularly cheap have interest to you guys? Cindy Croxton Electronics Plus 500 Pershing Ave. Kerrville, TX 78028 830-370-3239 cell sales at elecplus.com AOL IM elcpls

10 years, 1 month

Photo album and video from VCF West

by jwsmail＠jwsss.com

https://goo.gl/photos/KdnDMBHeryMZqctV9 Youtube Channel playlist of videos. Some walking around Saturday morning before the show, Charles Anthony's exhibit. Also a fellow who dropped by after my buying a PDP 11/34 and was one of the engineers. I recorded an impromptu interview with him. https://www.youtube.com/watch?v=UtmVGeVhr7A&list=PL5NK70kdq3-JGwb_8GXFN5SqD… Sherman Foy and I had a great time attending and participating in the event this year. Thanks to the organizers, staff and volunteers that were there to put it on. Thanks Jim

10 years, 1 month

VCFMW 11 Updates and Special Guest

by silent700＠gmail.com

Hello retro fans - we are approaching the one month point before the Eleventh Vintage Computer Festival Midwest and plans are quickly coming together. Here are a few announcements and updates to bring you up to speed: - We're happy to announce our very special guest speaker, former Commodore engineer, Bil Herd! Bil will deliver an entertaining 90-minute talk and Q&A on his time at Commodore and his many post-Commodore adventures in engineering that continue today. - We are going to be packed FULL! And that means full of great exhibits, including the ones listed here: http://vcfmw.org/ex.html. The main hall's tables are all accounted for but there will be some unassigned space in one of the side rooms for late-comers and impromptu displays. - VCFMW Auction - an experiment last year, now a feature! Quality entertainment and a fundraiser for the show, 4pm Saturday will see another auction of donated items at low starting bids. If you have items you wish to donate for auction, please get in touch with show organizers Friday night or early Saturday. Auctions items need not be classic computing related. No registration is required for the auction. - The Free Pile tradition continues! One corner of the "Grove" side room (http://vcfmw.org/HIEGV_FloorplanDetail.jpg) will be dedicated to the infamous Free Pile - leave your junk there but be prepared to take it home if it's still there Sunday afternoon! No printers, please! - Hotel rooms are still available at the $84/night convention rate; please follow the link at http://vcfmw.org or use the code "VCF" when calling the hotel; if you are unable to obtain the con rate, please let me know as I may have to ask the hotel to expand the reservation block. - We remind you that VCF Midwest is a community-funded show; we receive no funding from any other organization. If you appreciate what we do and you are able, please visit the donation links on our site at http://vcfmw.org. Please feel free to help us get the word out and re-post this message in your favorite vintage-related forum. Thank you for your interest and support and we'll see you in September! -j

10 years, 1 month

SWTPC 6800

by vintagecomputer＠bettercomputing.net

I think for me what gets confusing is where the various pins are. ?I have to read and re-resd pinouts to figure out where stuff should be. ?I sometimes have a brain fart and get it backwards. ?Yesterday part of my problem with my Tektronix box was having the numbering of pins on the terminal's DB25 backwards. ?Once I had that figured out it was just a matter of looping certain pins and we were good. ?It just adds an extra layer of fiddling. I have a question though.. there have been a few times where I thought the 6800 crashed but may not have. ?In several cases.. I sent a large loader file across and noticed errors coming through.. so I'd stop the machine. ?This was after teraterm said it had sent everything through. ?Is it possible the serial port on my PC is still trying to send out garbage for a while, messing up my connection to the 6800 until it finishes? ?I kept moving cards around but eventually it seemed to start working after so many powerups and time had passed.. Sent from my Samsung device -------- Original message -------- From: Brent Hilpert <hilpert at cs.ubc.ca> Date: 2016-08-09 9:49 AM (GMT-08:00) To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> Subject: Re: SWTPC 6800 On 2016-Aug-09, at 6:47 AM, Ethan Dicks wrote: > On Fri, Aug 5, 2016 at 6:55 PM, Chuck Guzis <cclist at sydex.com> wrote: >> On 08/05/2016 02:15 PM, Brad H wrote: >>> I have one more question for you guys -- I have a few CT-1024 >>> terminals and would really like this system to work with one of >>> those.? However, all of the CTs are quite delicate and are set I >>> think for 7, E, 2 @ 110 baud via soldered jumpers. >> >> Well, 110 bps is a bit on the slow side--great for teletypes, not so >> much for video terminals. > > And I am not aware of any USB serial adapters that do 110 bps.? If > anyone knows of any, post brand and model numbers. It didn't do 110, but I chanced across one USB/serial adapter that goes down to 75 bps. which fortuitously was just what I needed at the time for the model 28 teletype (with the appropriate gears) I was attempting to drive. The 75 wasn't readily accessible, I had to go to a low level in the unix config code and try sequential factors in the configuration for the rate, 75 being another factor of 2 down in the standard rate series 19,200 . . 9600 . . 1200 . . 300 . . 150 . .

10 years, 1 month

CCS S-100 system avail in Minneapolis

by billdegnan＠gmail.com

I was contacted about a CCS S-100 system available for pickup in the Minneapolis area. Contact me privately. Includes CP/M software, etc. A full station wagon full of stuff/docs. I don't know the guy, just trying to help out. http://www.vintagecomputer.net/contact.cfm Bill

10 years, 1 month

Video From VCF West

by vintagecomputer＠bettercomputing.net

Thanks muchly. ?Interesting.. his 6800 has the all black front panel but has the db25 holes in the back.. mine doesn't have the db25s. Sent from my Samsung device -------- Original message -------- From: william degnan <billdegnan at gmail.com> Date: 2016-08-08 6:30 PM (GMT-08:00) To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> Subject: Re: Video From VCF West > > > > Very cool stuff!? Thanks so much to everyone providing videos. > I'm curious.. I had heard Michael Holley would be there with a bunch of SWTPC stuff.. did that happen? > Brad > > http://www.vintagecomputer.net/VCFWest_2016/SWTPc_Exhibit.jpg He is the guy on the right, at his exhibit. B

10 years, 1 month

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