test-drb August 2016

test-drb@ccmp.vtda.org

175 participants
281 discussions

StorageTek 2920 9-track manual or instructions wanted

by axelsson＠acc.umu.se

Hi all, I have a Norsk Data ND110324 9-track drive which is a rebranded StorageTek 2920 with SCSI interface. So far I have only found a single manual for it, a quick guide card of 10 pages. Is there a manual out there which describes the unit a bit more in depth, like setting the SCSI address, diagnostic program codes, service, technical specifications and so on. So far I have got it to load a tape automatically and detect the recording density. Next step is to get it to talk to a linux-computer for imaging some old tapes. Thanks in advance, G?ran

8 years, 12 months

Y Combinator is restoring one of Alan Kay's Xerox Alto machines

by curiousmarc3＠gmail.com

Ken's in-depth blog post to go with the previous video http://www.righto.com/2016/07/restoring-y-combinators-xerox-alto-day_11.html > On Jul 5, 2016, at 2:46 PM, Curious Marc <curiousmarc3 at gmail.com> wrote: > > Video from yesterday?s work on the Diablo cartridge disc: > https://youtu.be/PR5LkQugBE0 > Should be up in a few minutes. > We were tickled pink to have official representation from PARC (former Xerox Parc) at the session. > Marc > > Ken?s new post on the monitor repair to go with my previous video. > http://www.righto.com/2016/07/restoring-y-combinators-xerox-alto-day.html > Al Kossow got us a new CRT tube, so we are probably going to try that this week-end. > Marc > > > Latest entry from Ken Shirriff, trying out BCPL (ancestor of C). On the emulator, not yet on the real machine: > http://www.righto.com/2016/06/hello-world-in-bcpl-language-on-xerox.html > > Marc > > There are only two entries right now: > http://www.righto.com/2016/06/y-combinators-xerox-alto-restoring.html > http://www.righto.com/2016/06/restoring-y-combinators-xerox-alto-day.html > Marc > >

9 years

Complete DisplayWriter on eBay

by cctalk＠ibm51xx.net

Well, looks like the seller cancelled the bids and suddenly item is no longer available. Would like to believe it is a mistake but we all know better... -Ali

9 years

DEC Pro 350/380 Memory Cards - Interchangeability?

by robert.jarratt＠ntlworld.com

I have a 350 and 380. Neither work. The 380 is reporting a possible memory error on the LEDs. Will the 350's memory work in a 380 (or vice versa)? Regards Rob

9 years

RQDX3 as secondary MSCP controller

by Mark＠Misty.com

Hi, Last year I rescued a dual-wide 8-position q-bus backplane. I added the wire wrap to convert it from 18 to 22-bit, and now can boot BSD2.11 from CMD/CQD SCSI controller and CF card at DU0, via an AztecMonster CF-SCSI adapter. If I remove the SCSI controller, I can boot XXDP >from an RQDX3 connected floppy drive at DU0. My CPU is an M8192 from the scrap-card guy on e-bay, and I'm using an M7195 SLU/ROM card for console. It's got 23-14534/23-146E4 ROMs. I'm using a 2MW Clearpoint RAM card. I'm fabricating a cool desktop flexiglass case, so I can put the tiny-pdp11/73 on the desk at work. The difficulty I am having is I would like to configure the system with both MSCP controller cards installed, so I can boot from either SCSI or floppy, preferably with the SCSI still starting at DU0 so my BSD2.11 CFs remain portable to my other system. I changed the W1-W11 jumpers on the RQDX3 for 17760334 secondary MSCP address. And, I installed W12 to start at MSCP unit number 4. I used the menu on the SCSI controller to set it for DU0-DU3-only device mappings (SCSI ID 0-3). My understanding is each controller needs the different CSR, and non-overlapping MSCP unit numbers. I confirmed I (finally) got the RQDX3 address jumpers because the bootrom memory map now displays 17760334-17760336 as in use, as well as 17772150-17772152 for the SCSI controller. I was expecting that I'd now be able to boot from the floppy at DU4 (BOOT> DU 4), but after a long pause, I get ?BOOTROM-F- DU 4 device error. I also tried "BOOT> 17760334 DU 4", but still no joy. Another oddness I noted was that with my original RQDX3 config, if I plug the M7516 ethernet card in, that breaks booting from floppy. Are there some other jumper changes I need to make on the RQDX3? Does anyone have any other suggestions about what I might be doing wrong? Mark -- Mark G. Thomas (Mark at Misty.com), KC3DRE

9 years

Wanted - two 27C010-capable EPROM emulators

by classiccmp＠philpem.me.uk

Hi there, Does anyone have a pair of spare EPROM emulators which are capable of emulating 27C010 EPROMs? Ideally two identical ones, but that's optional. I'm trying to reverse-engineer a Securicor Datatrak MkII navigation receiver and build a signal generator which can emulate a chain of Datatrak transmitters. I'm part of the way there, but I've hit something of an impasse: * My emulator isn't good enough to run the firmware on a PC (it crashes when the RTOS starts to boot). * My knowledge of the hardware is full of holes (especially the simple-but-custom ASIC). Porting a monitor ROM using EPROMs would take a fair while, even with the HP16700A to use as a "debugger". I'd like to try patching the firmware, but with bare EPROMs that'll take a while to get right. I could swear these things were as common as housebricks on ebay a year or so ago, but now they're not quite so common... Incidentally, if someone (preferable in the EEA) has a spare HP 16717A acquisition card (for the 16700A series logic analysers) for sale, I'd be very interested in getting another one -- my second 16717A seems to have died while in storage, and spying on the 68k has eaten up all the pod inputs on my one working card. Thanks, -- Phil. classiccmp at philpem.me.uk http://www.philpem.me.uk/

9 years

DEC Indicator Panels page

by jnc＠mercury.lcs.mit.edu

So, I've been working for a while on a page about DEC indicator panels (the standardized 36x4 light arrays which go into a 19" rack, with an inlay to customize it to a particular device). It's online now, here: http://ana-3.lcs.mit.edu/~jnc/tech/DECIndicatorPanels.html Does anyone happen to have a good image of an RK08 panel, or an RF11, which I can use here? Even better, does anyone know of, or have images of, panels which are not listed here? (I am not including the unknown 'RK' panel in the RSTS document, which will be the subject of a separate message.) Thanks! Noel

9 years

X Windows System Design Principles, a lecture by James Gettys

by tlindner＠macmess.org

I think it is dated 1988. https://www.youtube.com/watch?v=KdmNHM9BKY0 Interesting fact: His name is Gettys. Interesting quote: "We should never have done [the] Arc [drawing command], we should have done some spline implementation." -- -- tim lindner "Proper User Policy apparently means Simon Says."

9 years

How to build an ASCII CRT terminal, circa 1967

by COURYHOUSE＠aol.com

same as univac uniscope or? In a message dated 8/31/2016 8:41:06 A.M. US Mountain Standard Time, aek at bitsavers.org writes: On 8/31/16 8:35 AM, Paul Berger wrote: > it would be possible to have it generate 7 bit ASCII > code by using an appropriately "programmed" interposer under the keys. it does say the keyboard generates ASCII on pg 3-2 of the maint manual..

9 years

How to build an ASCII CRT terminal, circa 1967

by aek＠bitsavers.org

Magnetorestrictive delay lines and a charactron. http://bitsavers.org/pdf/rca/terminal/70_750/70-01-752-U_Model_70_752_Video… We got one (no keyboard) a couple days ago with the manual. I'm still cleaning it up. It had something nesting in it and the inside has sunflower seed husks in it. It was made with plastic DIP ICs, no idea of the logic family. The keyboard was made by IBM, don't know what character code it produces. Pretty funky if it encodes ASCII.

9 years

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test-drb August 2016