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Looking for bootable floppy image for a PDP11/20

by Martin Eberhard

I'm in the process of restoring a PDP11/20. Here is what is working so far: KA11 PDP11/20 CPU , power supply, programmer's console, etc. 32Kx16 SRAM/ROM board of my own design (Core memory will come later!) KE11-A Extended Arithmetic Element RX211 controller with RX02 drive, cleaned, spindle bearings replaced, aligned, tested, and working DL11-W Serial Line Unit with Real-Time Clock DL11 2nd serial port, modified to operate at 19,200 baud VT100, connected to the DL11-W I've written a program that lets me load a raw disk image (via Xmodem protocol) from the serial port onto a floppy disk, and verify the write. This works great, for both single-density and double-density. (It can set the media density as needed too.) I'm now looking for a bootable RT-11 floppy disk image (just a raw image, e.g. .IMG) that can boot and run on this limited hardware. The file should be exactly 256,256 bytes long if single-density, or 512,512 bytes long of double-density. (Actually, anything bootable on this hardware would be appreciated!) I'm new to this forum - let me know what is the protocol for giving you my email address... Thanks! Martin E.

1 year, 1 month

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null modem for DEC Pro 380

by Cameron Kaiser

DEC Pro owners: does the DEC Professional use a straight-thru serial cable, or null? -- ------------------------------------ personal: http://www.cameronkaiser.com/ -- Cameron Kaiser * Floodgap Systems * www.floodgap.com * ckaiser(a)floodgap.com -- BOND THEME NOW PLAYING: "All-Time High" from "Octopussy" -------------------

1 year, 1 month

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VCF EAST 2025 CALL FOR VOLUNTEERS!

by Jeffrey Brace

Volunteers are the backbone of making VCF East one of the best vintage computer shows. We are in need of volunteers in all areas. VCF East 2025 <https://vcfed.org/events/vintage-computer-festival-east/> takes place April 4-6 in Wall, NJ at the InfoAge Science and History Museums. Register to become a volunteer today! <https://docs.google.com/forms/d/e/1FAIpQLScRIqB1ZuseQ2ANYszT2RTw2_AMnnCv0ZI…> Click here to read Volunteer FAQ <https://vcfed.org/vcf-east-volunteers-faq/> Thanks! Jeff Brace VCF East Showrunner Vintage Computer Federation is a 501c3 charity https://vcfed.org/ <http://www.vcfed.org/>

1 year, 1 month

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AI? Really?

by Anders Gustafsson

Yes. I tried Operas Aria and asked a bit about HP1000 A-series. I started by asking the difference between A900 and A400 and got a reply that was partly correct, then followed up with some specific questions about the A400 that I happen to know rather well. It insisted that it had only 32Mb and it corrected itself. But the problem as always was that the answer LOOKED ok, but there was no way, without prior knowledge to weed out the errors. -- Med vänlig hälsning Anders Gustafsson, ingenjör

1 year, 1 month

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New DRAM (SIMM) board works but gives a parity error, only on cold powerup

by Anders Gustafsson

OK. As usual was the problem quite evident, once I understood it... I have two A400 boards. On that board I tested with I never took note of switch 8. It was unfortunately set to OFF indicating that there was backup power for memory. Thus the power lost flag was never set, which caused the parity error on startup. -- Med vänlig hälsning Anders Gustafsson, ingenjör

1 year, 2 months

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CDC Cyber 18x parts

by hupfadekroua

Hello all, I‘m searching the following CDC parts: 52948476 CM Board extender 91915206 CM Board extender 24614635 ZIF Board extender Of course I do know looking for such kind of items in our days may be some kind of peculiar, but who knows … Andreas

1 year, 2 months

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Try Algol 68 on Windows

by Mike Parr

Hello all. Here is a link to something I wrote - brief intro to Algol 68's background, and how to run it on Windows - with a toy IDE as well. https://mikeparr.info/algol68.html Mike Parr

1 year, 2 months

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Re: AI? Really?

by donald donaldwhittemore.com

Skynet became self-aware on August 29, 1997, at 2:14 a.m. EDT.

1 year, 2 months

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OT: not that classic but already old: Cubieboard2

by Holm Tiffe

Hi all, I've got 3 pcs. Cubieboard 2 SBC's with the Allwinner A20 SOC Chip on them. That's kind of a RaspberryPi SBC with an 2 Code Arm7hf on it. The boards are equipped with HDMI, USB, Ethernet (100Tx), SATA, SD Card slot and some 4G NAND Flash Cip on it. RAM is 1 Gbyte, CPU Clock is 996Mhz. Additionally I've bought some Base Boards for them, that's the DVK521 from Waveshare..contains the Baseboard, an Camera Module OV670, a 7" LCD with LVDS, a thermo sensor and other things.. Good HW in my eyes, but already outdated. I wnt to use the boards for some Home/house related stuff, PV, heating, Light control etc. and for that they should be more than enough. The Chips even have an graphics accelerator in the SOC. Now the Problem: as far as I know Allwinner has made some mistake using gnu/Linux stuff without any respecting the GPL. Because of that (if no other cause) most of the support Software on the net seems to be gone. There where some different Linux distributions for it, (Linaro, Cubieez etc) but most of the stuff isn't available anymore because of dead links. I've successfully build an modern Armbian image for them..but have endless trouble. The Xserver configutres an not existing Video Output, the LCD is unknown at all and if I manage to switch the X-server to the HDMI output using xrandr (only with tricks because it needs a session) the performance is like some old thick glue... Besides of that I had to fix an already for 8 years known Bug in the A20 Ethernet driver (it simpy has a more modern ethernet Unit as the A10 inside) that was'nt fixed at all. Armbian has only "community Support" fo those chips..which means that there is no support at all. If one asks for help the answer is more or less "find it yourself and provide a patch". I have an Linaro disk image that seems to be working, but there are some parts missing. The base distribution seems to be ubuntu 12.04 LTS (precise Pangolin) for armhf. I can't find a package repository anymore..(since that's long outdated). I've managed to install ssh by using an tarball of an ubuntu 12.04 armhf image for another board..and it works..but sshd is still missing. There are more modern disk images at https://mega.nz/folder/ZtwxCCJC#AIYHcTqz-ucjuzKnE9qD7A/folder/t0p2SBQD but mostly they don't even boot..possibly they using an newer/other uboot and uboot-envirnonment... Now the question: Is someone in the world still using those boards and has disk images/software for them? Again: I'ts not that much interesting that this is old linux, because I'll use that only inhouse in the lan, not browsing actual websites.. I'm a BSD guy and not know that much about Linux, especially such things as configurations for uboot etc. and there is none that I could ask for such things. Kind Regards, Holm -- Technik Service u. Handel Tiffe, www.tsht.de, Holm Tiffe, Goethestrasse 15, 09569 Oederan, USt-Id: DE253710583 info(a)tsht.de Tel +49 37292 709778 Mobil: 0172 8790 741

1 year, 2 months

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Fanuc Tape Reader PECs 1980's - Connector Identification

by Martin Bishop

1980's Fanuc tape reader PECs are fitted with two families of connector I am unfamiliar with : one is used for power and the other for signal connections -further detail and pictures in the following VCF post No joy on Burndy website or at BitSavers - wisdom gratefully received https://forum.vcfed.org/index.php?threads/fanuc-pec-connectors-who-is-the-o… Martin

1 year, 2 months

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