test-drb

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101090 discussions

by useddec＠gmail.com

I had my hired help here yesterday digging some things out for me. While looking for a LAB-8 for a list member they dug up a Lab Peripheral System 11. If anyone is interested in that or a MINC-11, please contact me off list. Oh, were still looking for the LAB-8. Maybe next weekend... Thanks, Paul

11 years, 5 months

DEC handbooks at LA estate sale

by brendan＠bslabs.net

Just a heads up for anyone around Los Angeles, I was browsing some local estate sale listings and saw one that had a big collection of DEC handbooks from the late-70s/80s: logic, software, microcomputer, peripherals, VAX software source book, VAX Architecture/Hardware/Software. It?s the last two pictures at: http://www.estatesales.net/estate-sales/CA/Los-Angeles/90049/823725 <http://www.estatesales.net/estate-sales/CA/Los-Angeles/90049/823725> Brendan

11 years, 5 months

How to save two Mitsubishi M2896 drive (spindle motor smoked!)

by enrico.lazzerini＠email.it

I have a couple of 8" drives Mitsubishi M2863 slim type that I recovered I think around on 1990 both in excellent conditions with which I created images and written several floppy disks 8". For some reason, including my incompetence, both their spindle motor do not run any more. And powering correctly with only +24Vdc the circuit part of the engine rotation control of the disk (called spindle motor) begins to smoke near a chip LB1620. The schematic contained in the maintenance manual of the drive includes components of other different model of spindle motor circuit. If that were possible, how could I to be able to run the drives correctly: reusing partly engine or even replacing it with analogous maybe even creating handcrafted a motor with pieces of recovery and manage the number of RPM (I think 360rpm for 8" drive) possibly with special circuit ? At this moment there is a shortcircuit between +24vdc pin and ground pin. Pics https://www.dropbox.com/sh/p12w71v69tjgfz7/AAAIReql4Se5ZCkLClPoAVOPa?dl=0 references M2896-63_Maintenance_Manual https://www.dropbox.com/s/8rhukkr1xf78m8c/M2896-63_Maintenance_Manual.pdf?dl =0 M2896-63_Half-Height_Drive_Brochure https://www.dropbox.com/s/elmj3nwz59dz2eo/M2896-63_Half-Height_Drive_Brochur e.pdf?dl=0 Spindle motor SRC SHINANO TOKKI CORP. MADE IN JAPAN 702V Modello DLF-3ME DC24V Any suggestion is welcome. Enrico

11 years, 5 months

MEM11 Status Update

by jnc＠mercury.lcs.mit.edu

> From: Guy Sotomayor > I'm using FRAM. They have unlimited write cycles Although I hear the latest flash have very, very large numbers of write cycles. But if you can get large enough FRAMs, yeah, they seem like a better alternative. > I didn't want to have any sort of removable media as that bring its own > sets of challenges. Oh well, back to loading all the bits in over a serial line (although I suppose if one has some other removable media drive, e.g. a RX02, one could get the bits in that way). >> (Or perhaps even a front-end running on a PC which is connected to >> the MEM11 over the serial line.) > That was my original thought (command front end) but that would mean > writing/supporting a bunch of different programs for different > OS/platforms Well, probably only at most two (Windoze and Linux), and maybe only one (since there are Windows emulation packages for Linux). Although if one stuck to a line-oriented interface, something like CygWin would allow one to have only one version. > and I want the MEM11 to pretty much stand on its own Oh, I agree that that's a worthy goal - the front-end would only be to make it 'user-friendly', instead of cryptic and terse. > the realistic limit will be on the Unibus interface ICs. I have (at > last inventory) enough for ~25 boards. After that I'll have to see if I > can either source additional parts or re-design that part of the board > to use something else. Yes, that _is_ a problem... Noel

11 years, 5 months

Passing of L. Nimoy

by c.murray.mccullough＠gmail.com

How can one not be impressed by L. Nimoy's portrayal of Mr. Spock? His character was logical, almost computer-like, but was far more a portrait of humanity than most care to admit to. Ancient/classic computing was a hall-mark of Star Trek and Spock personified that relationship. Murray :)

11 years, 5 months

3.5" floppy failure mode? Hub not attched to media.

by cclist＠sydex.com

On 02/27/2015 06:17 AM, John Foust wrote: > At 06:45 PM 2/26/2015, you wrote: > You're not concerned about the tolerance and re-centering issues? > You think the cookie will fit back on the hub precisely enough > that it'll be aligned with where tracks were before? Not so much. A 3.5" floppy is recorded at 135 tpi, where an 80-cylinder 5.25" floppy at 96 tpi. On 5.25" Drivetec floppies, the cylinder density is double that--192 tpi. Now consider the hub-clamp mechanism of a 5.25" drive. I suspect that with a bit of care, one can probably get things right most of the time. --Chuck

11 years, 5 months

My Data General MV/2500 is Up-and-Running

by steve＠stephenmerrony.co.uk

I am delighted to report that after a long time, and with help from all over the world, I have finally got my MV/2500DC up-and-running. Some details are on my blog http://www.stephenmerrony.co.uk/dg/2015/02/Disk-Replacement-Success.html Now I am resurrecting my DG Assembler skills to bootstrap a file transfer program onto the machine... Thanks to everyone who has helped. Steve -- /Stephen Merrony http://www.stephenmerrony.co.uk//dg

11 years, 5 months

von Neumann documentary clip

by hilpert＠cs.ubc.ca

Brief clip from a 1966 documentary about von Neumann: https://www.youtube.com/watch?v=Po3vwMq_2xA Goldstine presenting while standing in front of the IAS machine, which appears to be decommissioned and in storage. Fuel for the eternal fire: Goldstine seems to be pretty definite in attributing the stored-program concept to Johnny.

11 years, 5 months

Hilarious post Was: von Neumann documentary clip

by jnc＠mercury.lcs.mit.edu

So, in the course of tracking down the mentioned von Neumann papers, I ran across this: http://www.tomandmaria.com/tom/Writing/MorozovQuixote.htm which is utterly hilarious. (Note: it's even funnier if you're familiar with the work of Borges.) Noel

11 years, 5 months

Removing OpenVMS license paks

by dj.taylor4＠verizon.net

I want to sell a couple of MicroVaxes that I had installed the hobbyist OpenVMS software on quite some time ago. The OpenVMS Hobbyist website says I must delete the license PAKS before I transfer the hardware to someone else. How do you actually do this?

11 years, 5 months

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