test-drb

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101090 discussions

Interested in UNIVAC 9000 Series (and IBM 360)

by jnc＠mercury.lcs.mit.edu

> From: Chuck Guzis > On 11/18/2016 10:00 AM, william degnan wrote: >> Hot business women posing with classic UNIVAC hardware > Models? Yup. Definitely too hot to be business-women! (Hope Chuck doesn't mind being quoted out of context, but it was just too good to let pass... :-) Noel

8 years, 5 months

DEC bus receiver chips

by jnc＠mercury.lcs.mit.edu

So, I was glancing at pair of M784 Flip Chips, on early production, one late, and I noticed that the early one used SP380A's (marked "DEC 380A"), and the later one used DS8640's (marked "DEC 8640"), with the exact same PCB traces. So probably the latter is an alternative for the former. Noel

8 years, 5 months

National Semiconductor 48-bit and 56-bit ECC polynomials

by spacewar＠gmail.com

Has anyone determined what 48-bit and 56-bit ECC polynomials are used by the National Semiconductor hard disk controllers? The DP8496/97 allows choice of hard-wired 16-bit CRC, or 32-bit, 48-bit, or 56-bit ECC. The 32-bit ECC is a common polynomial known as the Glover polynomial, and it's the same one used by WD and others. However, National was apparently extremely proud of the 48-bit and 56-bit polynomials they chose, and the data sheets say that they require a license agreement with National. The more common DP8466 supports 32-bit 48-bit, but allows the user to configure the polynomial. The data sheet states that National's 48-bit polynomial is available under license. WD wasn't as proud of their 56-bit polynomial; it's given in the WD42C22 data sheet. It doesn't seem to match National Semicondutor's 56-bit polynomial.

8 years, 5 months

Fwd: [SIGCIS-Members] Jay Wright Forrester

by aek＠bitsavers.org

-------- Forwarded Message -------- Subject: [SIGCIS-Members] Jay Wright Forrester Date: Fri, 18 Nov 2016 21:27:40 +0000 From: Deborah Douglas <ddouglas at mit.edu> To: Sigcis <members at sigcis.org> I regret to announce the death of one of MIT?s leading computer pioneers Jay W. Forrester. Forrester died Wednesday, November 16 at age 98. The New York Times has published an obituary; MIT?s is being completed as I write. There will many who can offer comments on Forrester?s myriad contributions but here, I would add that he has been a stalwart supporter of the MIT Museum and a regular participant in many programs. I am grateful for his enthusiasm for sharing the details of his knowledge about the Servomechanisms Lab, Whirlwind, SAGE, Lincoln Laboratory, system dynamics and management. As more information becomes available, I am happy to share with interested individuals. Debbie Douglas *Deborah G. Douglas, PhD* ? Director of Collections and Curator of Science and Technology, MIT Museum, Room N51-209 ? 265 Massachusetts Avenue ? Cambridge, MA 02139-4307 ? http://mitmuseum.mit.edu ? http://museum.mit.edu/150 ? ddouglas at mit.edu <mailto:ddouglas at mit.edu> ? 617-253-1766 phone ? 617-253-8994 fax

8 years, 5 months

DNIX and ABCenix install media disk images.

by mattislind＠gmail.com

A guy in Sweden made the effort to image the install media for DNIX 5.3 and 5.12 as well as ABCenix 5.12. https://dl.dropboxusercontent.com/u/96935524/Datormusuem/dnix-imd.tar.bz2 https://dl.dropboxusercontent.com/u/96935524/Datormusuem/ABCnix.tar.bz2 These are for computers made by DIAB (later part of Bull) DS90 and Luxor ABC1600 (branded Luxor but developed by DIAB). https://en.wikipedia.org/wiki/Dataindustrier_AB https://en.wikipedia.org/wiki/ABC_1600 They all were 68k based. The early DS90 had 68010 + 68451 MMU. The ABC1600 had 68008 and some homebuilt MMU. The ABC1600 is quite a nice machine with 768x1024 b/w portrait screen that can be twisted into landscape. It has a simple windowing system. Actually half of the hardware that make up the system is the graphics board. Unfortunately the 68008 makes it quite weak. I hope that the imaged disk can end up in a safer place than my dropbox, for example Bitsavers... Thanks Jonas Malm for doing the disk images (I am just the messanger)! /Mattis

8 years, 5 months

Datamation, May 1972

by kylevowen＠gmail.com

Does anyone have a scanned (or hard) copy of this? I'm trying to locate one, without much success. I'm mostly interested in the article entitled "Capture and Display of Keyboard Music". Thanks! Kyle

8 years, 5 months

NCD16 images. Was: NCD19 / Xncd19

by fjkraan＠xs4all.nl

Hi, Some 20 years ago I briefly had some NCD16's and found some of the tarred images and software from those days. Hopefully it survived the various media transfers. Fred Jan

8 years, 5 months

Datamation, May 1972

by Arno_1983＠gmx.de

Paul Koning <paulkoning at comcast.net> wrote: > Interesting. From around 1975 or so (...) A few years later (...) > Not long after, Lippold Haken created a keyboard that's continuous rather than discrete (think of a keyboard like the fingerboard of a violin); a successor of that is still sold today. This thing here https://en.wikipedia.org/wiki/Continuum_Fingerboard ? Seems a bit like a digital successor to, or at least inspired by, the analogue 1930s "Trautonium" device (https://en.wikipedia.org/wiki/Trautonium) developed by Trautwein and Sala in Berlin, which used a length of resistance wire suspended over a metal rail. Both position (pitch) and pressure (volume)sensitive according to the description. Arno, DO4NAK

8 years, 5 months

Doug Englebart - mouse!

by jnc＠mercury.lcs.mit.edu

> From: Fred Cisin > Who has some time to go clean up Wikipedia? I'll get right on it ... as soon as I finish bailing out the ocean with a spoon. Wikipedia - proof that if you give a million monkeys keyboards, they can create something that vaguely resembles an encyclopaedia. Noel (who was an early Wikipediast, until the Marching Morons arrived)

8 years, 5 months

Double Buffer RK11-C

by jnc＠mercury.lcs.mit.edu

> From: Ethan Dicks > I haven't even made an inventory of it. What would I look for to know? Check out the module utilization chart, either in the RK11-C Engineering Drawings, or here: http://gunkies.org/wiki/RK11_disk_controller (at the top of the section "RK11-C Board chart/count tables"). On a stock RK11-C, slots 1-8, rows C-D (the bottom two rows) are empty. In the "Double Buffer" variant, they are full of Flip Chips. (I'll be documenting the added Flip Chips in the Double-Buffered variant 'soon'.) Noel

8 years, 5 months

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