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101090 discussions

by healyzh＠avanthar.com

I really want to see this set produced, especially for the ?Ada Lovelace? and ?Admiral Hopper? portions of the set. https://ideas.lego.com/blogs/a4ae09b6-0d4c-4307-9da8-3ee9f3d368d6/post/f39b… https://ideas.lego.com/projects/3bf5b46c-6c87-4a2d-a2e1-d31ed0e2739e Zane

3 years, 11 months

External SCSI Drives on DEC2000 AXP

by g4ajq1＠gmail.com

I am trying to format a couple of SCSI drives on the Alpha.? They are connected using the external cable and are mounted in an Open Storage Systems (OSS) box. The drives were working when removed from a PC. SRM shows only one of them coming up as DKA200.? I have set the two drive ID switches to 2 and 3. Lack of info is hampering me, I have gleaned form various sources that the following command should work: >>>t scsi format a 2 0 which just returns >>>OK immediately, without doing anything. VMS allows me to ini the disk, but then when I try to mount it, I get an operator services message saying it is offline, please mount volume in _$3$dka200: Anybody with experience here? cheers, Nigel -- Nigel Johnson, MSc., MIEEE, MCSE VE3ID/G4AJQ/VA3MCU Amateur Radio, the origin of the open-source concept! Skype: TILBURY2591 nw.johnson at ieee.org

3 years, 11 months

cctech Digest, Vol 87, Issue 3

by w9gb＠icloud.com

Power Supplies, due to their Weight, are placed at the bottom of Racks (prevent tip overs ? weight distribution). https://avitech.com.au/?page_id=366 The PDP-11/70 Maintenance and Installation Manual (EK-11070-MM-002) explains that the basic PDP-11/70 system components are located in a double cabinet as shown in Figure 1-1 of that manual. https://i0.wp.com/avitech.com.au/wp-content/uploads/2016/05/major-assemblie… greg > Date: Sat, 4 Dec 2021 19:28:01 -0800 > From: Marc Howard <cramcram at gmail.com> > To: "General Discussion: On-Topic Posts Only" <cctech at classiccmp.org> > Subject: Need picture of power supply mounted in 11/40 cabinet > > Hi, > > I've got an 11/40 I'm going to start working on. Problem is that there are > two power supplies (H742 and H7420) that came with it but neither was > mounted in the rack. > > Could someone post/send/etc. photos of how the power supply mounts in the > rack? Also how is the power cabling routed (I think I'm missing this part)? > > Thanks, > > Marc Howard

3 years, 11 months

Disk cartridge storage racks

by Flash688＠flying-disk.com

I am in need of some disk cartridge storage racks. The kinds I am looking for are the ones used for front-loading cartridges (IBM 2315, DEC RK05, etc.) as well as the ones for top-loading cartridges (IBM 5440, DEC RL02, etc.). They were typically made of welded wire, and stored the cartridges on edge. I could use either the free-standing ones that sit on a shelf, or the ones that were designed to go in a Wrightline cabinet. I am in northwest Oregon and am willing to drive anywhere in the neighboring states to pick them up, or pay for packing and shipping. Thanks, Alan Frisbie

3 years, 11 months

Testers with Alpha or DECstation hardware with framebuffers?

by abs＠absd.org

I've been trying to fixup NetBSD to build usable X servers from up to date Xorg for Alpha and MIPS based DECstations, and wondered if anyone on list had any machines to hand on which they might be willing to test? There is a full distribution (individual set files and bootable ISO image) in http://sync.absd.org/xwsfb/ - the README from that directory is included below. If anything is non obvious, or it would help to have test images in a different format, just let me know Thanks David xwsfb - v1.2 This contains wsfb Xorg builds for NetBSD/pmax and NetBSD/alpha from 2021-12-03 sources Changes from stock NetBSD tree: - Add WSDISPLAYIO_GET_FBINFO to dev/tc TURBOchannel display adaptors - Enable building Xwsfb X server for pmax - Switch alpha from Xorg 1.10 to 1.20 (plus tweaked bsd_ev56 from 1.10) - (diffs in xwsfb.diff) Things to test: - Any and all framebuffers, TURBOchannel (and also PCI on alpha) - Confirm if keyboard mapping is correct (and does console match x11) - Does uxterm work on alpha pmax issues: - uxterm and LC_CTYPE=en_US.UTF-8 in general do not work - Escape does not work on gxemul console (not a regression from stock) To install and test pmax in gxemul - Install gxemul :) - eg pkgsrc/emulators/gxemul - Create a 2GB disk image: dd if=/dev/zero of=pmax.img bs=1m count=2048 - Run: gxemul -X -M 256 -e 3max -d pmax.img -d b:NetBSD-9.99.92-pmax.iso - Follow prompts to install - At the end - select 'Add a user' and make sure it is added to wheel - Exit and halt - Run: gxemul -X -M 256 -e 3max -d pmax.img (wait ~forever for fontcache) - Login as root, edit /etc/X11/ctwm/system.ctwmrc and change "uxterm" to "xterm" - Run: startx - Optionally: (if user is in wheel group), enable xdm=YES in /etc/rc.conf To upgrade an existing NetBSD-9.99.92 install - Ensure you have the following from this location (where arch is alpha or pmax) - ${arch}/binary/kernel/netbsd-GENERIC.gz - ${arch}/binary/sets/xbase.tgz - ${arch}/binary/sets/xcomp.tgz - ${arch}/binary/sets/xetc.tgz - ${arch}/binary/sets/xfont.tgz - ${arch}/binary/sets/xserver.tgz - Copy /netbsd to /onetbsd, then extract netbsd-GENERIC.gz as /netbsd - Wipe /usr/X11R7 then extract x*tgz from / - For pmax only: edit /etc/X11/ctwm/system.ctwmrc & change "uxterm" to "xterm" - Run: startx - Optionally: (if user is in wheel group), enable xdm=YES in /etc/rc.conf

3 years, 11 months

Women of Computing

by jnc＠mercury.lcs.mit.edu

Can we please return to discussions of actual classic computers, before our long-suffering list host shuts the list down _again_ for this sort of argument, this time perhaps forever? Thank you. Noel

3 years, 11 months

Source for DEC TC01 (and similar) bulbs?

by derschjo＠gmail.com

Anyone sitting on a pile of these or know where to find some? These were originally Dialco 507-3917 or Drake 11-507 based on what was installed in mine. 24V, 40mA, white. A total of 23 bulbs were dead on my TC01's panel. I've installed a pile of electrically/physically compatible bulbs that I happened to have, but they're yellow/orange and have a different visual design (the yellow lens sticks out 1/8" or so, whereas the orginals were flush). I'm honestly fine with using them but it'd be nice to have something that looks original. And a small progress update: Found that the IOT decode for READ STATUS B wasn't working, which is done on the W103 decoder at E/F19. With that resolved the diagnostics are behaving much more rationally. This took me much too long to trace down, but I learned a lot about how the controller works and found a fun (but ultimately harmless) bug in the Basic Exerciser diagnostic that threw me off for a couple of days... The Search Scope loop diagnostic shows block numbers going by in both directions so a lot of the drive and controller are working, but there's some glitchiness in bits 2, 5, 8, and 11 of the data so I need to trace that down; I hope it's not the tape head. - Josh

3 years, 11 months

alt.folklore.computers... Altair Bob

by wh.sudbrink＠verizon.net

A very, very long time ago, when dinosaurs still roamed the earth (or at least the computer rooms) there was a guy on usenet who called himself "Altair Bob" and offered to buy Altair computers. This was back when they weren't worth all that much (mid to late 1980s). He must have bought a dozen or so (as I remember). Does anybody know who he really was and what became of his (what I'm assuming was a) collection? Just idle curiosity brought on by a recent discussion of collections being destroyed by widows. Bill S. -- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus

3 years, 11 months

pdp8/L restoration time, part 1: switches

by cz＠alembic.crystel.com

I've decided it's time to fix my second pdp8/L. First one is missing (I think it's at the bottom of the closet) so I'll work on this one for awhile. First problem: Testing the lamps and switches. If the switches don't work or the lamps are out it's not going to be easy to troubleshoot. Currently I'm missing 5 of the plastic switches, and I have 2-3 switches with a broken pivot. Since I was going to need new plastic switch covers I fired up the 3d printer, downloaded the STL file for making them (thank you for putting that up!) and ran off a few for testing. It helps a lot to set the bridge angle value to 60% or so, that allows a nice solid bridge for the two "teeth" that engage the rocker switch. Also don't bother with PLA: The plastic pivots are too weak and break pretty quickly. Use PETG, which requires higher heat (240 instead of 200 at the head and 70 instead of 60 at the base) but it is more than strong enough for the pivots to go in without issues. Testing the switches I found that one of the data/address switches was reading high ohmage (20) when closed in the down direction and two of the data entry (spring loaded) switches were intermittent. Sprayed in a bit of Deoxit, and they now switch cleanly and without bounce. That would probably have driven me crazy if I tried to test with that. Next step: Check out the power supply..... C

3 years, 11 months

Datapoint 2200 on ebay

by osi.superboard＠gmail.com

In my opinion, the Datapoint 2200 on ebay seems to be a 1100 Cassette Terminal. There are two theories - It is a true 1108, as the silver machine label indicates. This 1100 versions showed up in 1974 as described by the LCFGROUP and have been a variant to the 2200 with less memory , using most of the 2200 parts, except the power supply at the back. This has been re-designed. The Datapoint 2200 on ebay is most likely a 1100. But it has the 2200 logo at the front, how can this be ? Ken Whitehead may have the answer for that: StaTuesday 17th July 2012 Ken Whitehead (USA) Other comments re: confusing the 1100/2200/5500/6600 may have arisen >from the fact that all of the enclosures for these models started life with 2200 molded into the plastic bezel. The 1100, 5500 and 6600 models had a separate logo that was applied over the existing 2200 logo. Since double-stick foam tapes were used, over time the tape let loose and the ?new? logo fell off. We had a few customer complaints re: the instant downgrading of their computers when this happened! Alas, we know that for all of those that complained, many more didn?t, giving possible rise to the confusion of what the machine actually was. - My second theory is, it is one of the 1100 terminals, that have been upgraded to a 2200, yes that was possible. The Dataform_1100_Brochure_1974 says: System Expandability. The 1100 user need not fear an application outgrowing an 1100's capabi lit ies. If additional data input locations are required, the 1100 can be upgraded to a Datapoint 2200 DATASHARE System. Seems this was offered along the introduction of the 1100, about 3 years after market introduction of the 2200.With this upgrade came extra 8kb more memory (2 more RAM boards) and a new front cover or removal of the 1100 logo plate ? In any case it is not a Datapoint 2200 as advertised. A real 2200 looks like this: http://datapoint.vintagecomputers.square7.ch/index.html Anyone with another good explanation ? Thomas Sun Nov 28 13:27:20 CST 2021 Previous message: Micro Technology Board Info Next message: Datapoint 2200 on ebay Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] Noticed a Datapoint 2200 on ebay.... https://www.ebay.com/itm/275043446827 They're asking $48,000 I want one...but not for that price! :) Previous message: Micro Technology Board Info Next message: Datapoint 2200 on ebay Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] More information about the cctalk mailing list

3 years, 11 months

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