test-drb October 2016

test-drb@ccmp.vtda.org

203 participants
312 discussions

Time to get rid of weird connected appliances! <<SKYNET MUST DIE>> check this

by COURYHOUSE＠aol.com

Time to get rid of weird connected appliances! <<SKYNET MUST DIE>> check this.... http://www.msn.com/en-us/news/technology/how-your-dvr-was-hijacked-to-help-…

7 years, 6 months

ASTEC 8151 PSU (TRS80, Osborne etc)

by witchy＠binarydinosaurs.co.uk

Hi folks, Now that the bouncing has calmed down I've got a question about this here triple output pretty ubiquitous power supply. This one had some burst caps so naturally wasn't working and was probably why the machine it came out of was taken out of use. I've replaced all of them because why not, along with the .1uF mains filtering cap that would also burst at some point and I still get low output on all rails. I've tested all the major components out of circuit and checked for shorts; in Apple ][ power supplies (also Astec, apart from the ones that aren't) low output is mostly caused by a feedback capacitor (C7) going out of spec, but these are all new and as close a match to the originals I could find. One thing I've not done is reflowed all connections so I'll do that later, but has anyone got experience of common failure modes with these things? Cheers -- Adrian/Witchy Binary Dinosaurs creator/curator Www.binarydinosaurs.co.uk - the UK's biggest private home computer collection?

7 years, 6 months

Free - IBM PS/2 model 30-286, 50, and 77 for spares/repairs. (Bristol, England)

by tomjmoss＠googlemail.com

Hi All, I have a few IBM PS/2s in various states of disrepair that are free to anyone willing to collect from Yatton (Near Bristol), or arrange a courier. Systems as follows: Model 30-286 - powers on to BASIC prompt, bad floppy drive, missing hard drive. A few minor scuffs, should make an easy restoration. Model 50 - Boots from HDD to DOS, has bad sectors but might be OK after a low level format, haven't tried it because the FDD is bad. Includes untested tape drive in the second 3.5" drive bay. Some rust spots on case. Model 77 - Very good cosmetic condition but doesn't power on, corrosion around the BIOS chip so I'm guessing it's because of that. If anyone's interested I can take photos and find out the system specs. I also have one of the later IBM PS/2 mice. Regards, -Tom

7 years, 6 months

PDP-11 RL02 disk emulation

by jnc＠mercury.lcs.mit.edu

> From: Scott Baker > Feedback on this project is most welcome. Any chance it could be put into 'production'? It just seems to me that rather than having 53 people send in individual orders for boards, etc it would be better (and also perhaps get a price break due to volume) to do a small run. (You may not want to produce complete boards, but even kits would be useful.) I think an RL02 simulator is a great idea; those of us with RL0x controllers could use this most of the time, avoiding potential damage to our old drives/disks; I know I would buy several if they were available. Also, what FPGA board are you using? I assume it's one that has an SD card socket or something, for actually storing the bits on? Noel

7 years, 6 months

VTServer/etc for V6 Unix

by jnc＠mercury.lcs.mit.edu

The fact that the installation procedures for V6 and V7 are wholly different, in their technical detail, was apparently not well known. The 'Setting up Unix' documents are more checklists, they don't go into a lot of detail as to what is actually happening, so I have prepared two pages on the Computer History wiki: http://gunkies.org/wiki/Installing_UNIX_Sixth_Edition http://gunkies.org/wiki/Installing_UNIX_Seventh_Edition which go into more detail on what is actually happening. Noel

7 years, 6 months

OT: Excessive bounce notices?

by kspt.tor＠gmail.com

On 22 October 2016 at 17:27, Adrian Graham <witchy at binarydinosaurs.co.uk> wrote: [..] >> Same story from me, and I also wondered about the excessive bounces - >> because of gmail. > > Ditto, and ditto. I also thought it was due to the dyndns attack so just > resubbed after emailing Jay, but if everyone did that who got an excessive > bounce message the poor chap will have quite a full inbox. Yes, it must have been that attack. I wasn't aware of it at the time, probably because I rely on 8.8.4.4. DNS which was never affected. We still need that global task force to hunt down spammers and ddos'ers and get rid of them once and for all. Or at least inflict some discomfort.

7 years, 6 months

Unibus disk controller with modern storage

by shadoooo＠gmail.com

Hello Dave, exactly! But in place of a plain FPGA, nowadays I would choose a FPGA-ARM board, for example the ZedBoard MicroZed or the Myirtech Z-turn, both of them have a Zynq onboard, and they can run linux for the software side and programmable logic for the interface side. Very nice and flexible. For the development, I'm trying to figure if an hybrid QBUS / UNIBUS solution is possible. Of course one have to switch some jumper to avoid conflicts, but hey, in the end you would have a true universal board. What kind of bus transceivers did you used for the QSIC, specially because you have to go from 5V open-drain logic to 3.3V logic? Thanks Andrea On 10/21/2016 07:00 PM, cctalk-request at classiccmp.org wrote: > You mean, perhaps, something like this? > > http://pdp10.froghouse.org/qsic/html/overview.html

7 years, 6 months

Looking for HP98034 / HP9895 ROM images

by cruff＠ruffspot.net

> On Oct 18, 2016, at 11:00 AM, cctech-request at classiccmp.org wrote: > > does anyone of you happen to have the images of the firmware ROM of > HP98034 module and/or of the HP9895 disk drive, please? I?ve sent F.Ulivi the contents of the single ROM version from my 9895A, along with some preliminary reverse engineering work on the contents that I?ve done in conjunction with Eric Smith.

7 years, 6 months

OT: Excessive bounce notices?

by barythrin＠gmail.com

Just curious, I probably could have just asked Jay but incase this was wider spread I received a message that my subscription at my Gmail was suspended due to bounces. I was wondering if that may have been only today and more widespread from the Dyn dns ddos that happened? If so others may want to double check for similar issues as I probably missed some messages today. No biggie, just a PSA if it affected more than myself.

7 years, 6 months

Altos 686/886 (i286) MFM drive parameters

by aek＠bitsavers.org

micropolis 1325 --sectors 16,0 --heads 8 --cylinders 1024 --header_crc 0xffff,0x1021,16,0 --data_crc 0xffffffff,0x140a0445,32,5 --format WD_1006 --sector_length 512 40 meg disk in the system used a 1323, 4 heads instead of 8

7 years, 6 months

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test-drb October 2016