test-drb

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101090 discussions

by COURYHOUSE＠aol.com

the red apple ref book had a 5 level running off game port or??? something as I remember....Ed# In a message dated 10/15/2015 11:20:28 P.M. US Mountain Standard Tim, unclefalter at yahoo.ca writes: Thanks for this great explanation. So would anyone doing computing back in the early 70s have used a 5 level machine? I saw this one on ebay (or is it two? Not sure what the deal is here) It's probably sacked: http://www.ebay.com/itm/Teletype-equipment-1-model-28-writer-1-reperforater- 1-50vdc-supply-etc-/121784463105?hash=item1c5aeb6f01:g:UR8AAOSwnDZUJHWs -----Original Message----- From: cctalk [mailto:cctalk-bounces at classiccmp.org] On Behalf Of Brent Hilpert Sent: Thursday, October 15, 2015 10:07 PM To: General Discussion: On-Topic and Off-Topic Posts <cctalk at classiccmp.org> Subject: Re: Fair price and ways to find a teletype On 2015-Oct-15, at 6:25 PM, Brad wrote: > > Also separate question to others: I want to stay away from the Baudot machines, right? (ie. Model 28, etc) I'd say it largely depends on what your interests or purposes are. A brief overview of the technology: In the main, there were 3 generations of teletypes: Era Common Model Code Speed Common Interface Mechanism ====== ============ ========== ======= =============== ============ 1) 1930s-40s: Model 15,19 5-level ~30-50 bps 60mA current loop Modified Typewriter Cage 2) 1950s-60s: Model 28 5-level <=75 bps 60mA current loop Typebox 3) 1960s-70s: Model 33 7/8-level/ASCII 110 bps 20mA current loop Type Cylinder These are the "page printers" that would type across and down sheet paper fed from a roll. There are other models, variations on the above. Not included here are the tape printers, simpler mechanisms that printed in one dimension on a narrow paper tape, ala stock tickers. The mechanism was the overriding distinction between these generations as speed and code capability followed from the mechanism: 1) Modified Typewriter Cage: Decoding bars select 1-of-30-odd symbol/type arms arrayed in an arc, to swing and hit the paper, just like a common typewriter. 2) Typebox: An ~ 1" by 2" metal box holds typeface symbol pins in two 4*8 matrices. The box is shifted up/down and left/right to bring a selected symbol pin between a hammer and the paper. 3) Type Cylinder: A cylinder embossed with the typeface is moved up/down and rotated CW/CCW to select a symbol. The 5-level devices are commonly referred to as Baudot devices but this is not strictly correct as they generally use the ITA2/USTTY codes (International Telegraphy Alphabet No.2). The speed of Model 28s (at least) was determined by a selected gear-set. 5-level machines need code conversion of course. They all need current loop interfaces. A lot of old computer equipment will do 110 bps as the 33s were so associated with computers. For working form modern equipment, the bit rates for all of them are potentially awkward. When working on the 28s, which were geared for 75 bps, I lucked out as I found the USB-serial interface I was using could do 75 bps - not entirely surprising as 75 is a factor of 2 down in the common 9600,1200,300 bps series. How many USB-serial interfaces are capable of this I have no idea. Regardless, the baud rates are slow enough that bit-banging from a program is not difficult, or an adjustable RC oscillator to a UART should do. ----- No virus found in this message. Checked by AVG - www.avg.com Version: 2015.0.6172 / Virus Database: 4447/10805 - Release Date: 10/12/15

10 years, 6 months

The Burroughs B5900 and E-Mode

by lproven＠gmail.com

I don't know if this memoir is well-known or not, but I thought it might interest. ? The Burroughs B5900 and E-Mode A bridge to 21st Century Computing By Jack Allweiss Copyright 2010 My name is Jack A. Allweiss, also known as ?The Father of the B5900 System?. I did not give myself that title, my friends and co-workers at Burroughs Corporation did, and I consider it a great honor. This true story is about the B5900, and why it was an important milestone for Burroughs and later Unisys, as well as the computer industry in general. ? http://jack.hoa.org/hoajaa/BurrMain.html -- Liam Proven ? Profile: http://lproven.livejournal.com/profile Email: lproven at cix.co.uk ? GMail/G+/Twitter/Flickr/Facebook: lproven MSN: lproven at hotmail.com ? Skype/AIM/Yahoo/LinkedIn: liamproven Cell/Mobiles: +44 7939-087884 (UK) ? +420 702 829 053 (?R)

10 years, 6 months

nut bars? ;)

by jwest＠classiccmp.org

Perhaps my google skills are challenged (probably so), but I can't find this. Is there a modern source of nut bars that one could order with specific thread size and # of holes (NEMA pattern)? Yeah, I know I'm being OCD and can just use individual nuts. But after you keep losing a handful of standard nuts in the bottom of the rack, I see why they used nut bars. In some cases, nut bars are very preferable to cage/clipon nuts. J

10 years, 6 months

8-sector decpacks?

by JoshD＠LivingComputerMuseum.org

Does anyone have any idea what drive/system an 8-sector decpack would have been used with? We have a few of them on our shelves at the LCM and I can't find any reference that mentions 8-sector packs. (Just the usual 12 and 16-sector ones.) They're clearly labeled "decpack 1100 BPI - 8" and the sector ring marks out eight sectors. These are RK05 (IBM 2315) style packs. Thanks, Josh Sr. Vintage Software Engineer Living Computer Museum www.livingcomputermuseum.org<http://www.livingcomputermuseum.org>

10 years, 6 months

FOUND RE: nut bars? ;)

by jwest＠classiccmp.org

Cindy wrote... ----- Are the one you want made by Accuride perhaps? http://www.accuride.com/media/1975/rackmountaccessories_pdf_3.pdf They call them "bar nuts" :-) ----- BINGO! That's the ones :) Thanks Cindy!!

10 years, 6 months

Fair price and ways to find a teletype

by radiotest＠juno.com

At 07:59 PM 10/15/2015, drlegendre . wrote: >Sounds like another nice freebie M15 just popped up on the greenkeys list.. >though it's stateside, and once again in St. Louis! There ought to be plenty of the 15-RO units kicking around in the States. Time was when every almost radio station in the country had one (or sometimes two in larger markets) for AP or UPI. I have an ex-UPI 15-RO that I would like to get rid of. I once thought of restoring it, but I have too many other more useful things awaiting restoration. Dale H. Cook, Roanoke/Lynchburg, VA Osborne 1 / Kaypro 4-84 / Kaypro 1 / Amstrad PPC-640 http://plymouthcolony.net/starcity/radios/index.html

10 years, 6 months

The Burroughs B5900 and E-Mode

by jnc＠mercury.lcs.mit.edu

> From: Liam Proven > I don't know if this memoir is well-known or not, but I thought it > might interest. > ... > http://jack.hoa.org/hoajaa/BurrMain.html Wow! What a fabulous story/writeup! Highly recommend to everyone. Noel

10 years, 6 months

ULTRIX-11 3.1 manuals / help?

by derschjo＠gmail.com

Hey all -- Anyone have a copy of the ULTRIX-11 3.0 or 3.1 manuals lying around? I've got the 11/44 up and running with an SMD disk and a SCSI 9-track tape drive and I have ULTRIX-11 3.1 installed. (Yay!) But there are issues (Boo.) Unfortunately, the "setup" tool (and *what* a tool it is!) doesn't seem to be able to access the tape drive to install optional software. (I know it's working -- the files are there in /dev, mt talks to it fine and I can dd files off of it no problem). Of course, in a very un-UNIXy move on DEC's part, "setup" is an executable, not a shell script so I can't see what the heck it's trying to do. And in a *very* UNIXy move, "setup" provides no actionable diagnostics whatsoever. It immediately fails (having made no attempt to access the drive as far as I can tell) and prints "Open of distribution device FAILED: Try again <y or n>?" I'd like to be able to restore the rest of the optional software and whatnot; the files on the tape appear to be tar archives so I can just do it manually (and tediously) and I imagine that that's what the setup tool does *anyway*, but I'd like to at least *try* to do it the official way. Anyone have any experience here? Also, having an actual manual would be useful, ULTRIX-11 3.X seems to be considerably different than 2.0 (at least in that it has this wonderful new "setup" program I'm having so much fun with), which is all I've been able to find. Thanks as always, Josh

10 years, 6 months

VT52s, VT61s lots of DEC and DG keyboards- return trip through Maine, MA, NY, PA, OH, IN to IL

by useddec＠gmail.com

I'll be picking up a huge lot of DEC and some DG keyboards( no part numbers yet) over the next few days. I know what some of the DEC gear is and the condition of it, but not of the VTs. I would expect some power supply problems, but have no idea of tube rot/burn or cosmetics, except that all are complete. I don't really want to have to ship any, but I have reached out to one list member and will ship to him any possibly others. Boxing them, putting them in a gaylord and putting them on a pallet is the best I can come up with. This will be costly and labor intense, and if I have to ship, with one exception, I would prefer 4 to 6 units at a time. When I get home in a week or so I'll be putting out a list of unibus options which include the backplane and boards- like DB11-A bus repeater, DR11B, DH11s, a lot of com options, RH11, etc. Any questions, please contact me off list. Thanks, Paul

10 years, 6 months

IBM 029

by jws＠jwsss.com

Someone on FB pointed out that the 029 was announced this day in 1964. I've got one as well as a 129. I didn't realize they were that old of a product. The 029 was the first keypunch I used in school. http://www-03.ibm.com/ibm/history/exhibits/vintage/vintage_4506VV4002.html Thanks Jim

10 years, 6 months

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