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Recovering intel intellec microcomputers, hardware and software

by jonesthechip＠logicmagic.co.uk

As the venerable intellec microcomputers have reached their half-century, I'm interested in contacting other owners/collectors to try and obtain original assembler tapes (or their contents) to enable restoration of systems to full working order. My particular interest is in the intellec 4 mod 40 (I've rebuilt the one I used in college, 1975-1977) but I don't have the original software, supplied on paper tape. I've also been in contact with other owners and people interested in making replicas of the intellec 8 and mod 80 systems, and there's a lack of info on the the ROM monitors. Given the historical significance of these fine machines (and my personal annoyance at the lack of foresight I had as a callow postgraduate regarding hanging on to copies of paper tape) I'd like to put a shout out to see if any of this information/software is available in a historical nook or cranny somewhere in the computing world and try to gather it together to help complete systems and share the techniques used when 4K of RAM was a really big, expensive and rather hot deal....

2 years

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Looking for a A990 20-slot chassis

by Jesse Dougherty

Does anyone have a 20-slot HP 1000 990 chassis p/n A2959 / A2999 for sale? I can also trade for other 1k / mx HP related hardware. Feel free to email me direct off group to Jesse(a)Cypress-tech.com Thanks Jesse Jesse(a)Cypress-tech.com

2 years

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Re: Ward Christensen NY Times Obituary

by Fred Cisin

On Wed, 23 Oct 2024, Mike Katz wrote: > I agree with you but phrased differently. XMODEM is ubiquitous but CBBS created a > totally new way of sharing information and is the forerunner of everything from > CompuServe to the internet, instant messaging and even social media. > > Most people reading an obit would not appreciate the significance of a data transfer > protocol however the first "social media" type message system they would understand. Community Memory (Lee Felsenstein, Ephrem Lipkin, et al) preceded it by about five years. BUT, CBBS was the first with dial-up access [from home], rather than dedicated publicly available terminals. -- Grumpy Ol' Fred cisin(a)xenosoft.com

2 years

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Re: RSX11M installation on real PDP11

by Lee Gleason

On 10/19/2024 12:00 PM, cctalk-request(a)classiccmp.org wrote: > [cctalk] Re: RSX11M installation on real PDP11 >You may want to use simh (where you'll be able to mount tapes and RL02 >images) to do the installation and generate an RD32 image. Once you have >the disk image, use vtserver (note - some versions are limited to 32MB >images, but there are some that remove that limitation - check if the >struct vtcmd in vtserver.c uses 2 or 4 bytes for the block number), or >PDP11GUI (Windows only) to transfer the RD32 disk image to your PDP over a >serial port. If you go this route, be advised, that SIMH creates RD32 disk images are not the same size as a real RD32. This will likely cause problems when writing a SIMH created image to a real disk (and I'm not talking about the additional issues that the trailing metadata on disk images from the Pizzolato version of SIMH can cause - the problem I'm describing is caused by an incorrect disk size value in SIMH). -- Lee K. Gleason N5ZMR Control-G Consultants lee.gleason(a)comcast.net

2 years

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Re: Might be antique computer parts

by donald donaldwhittemore.com

I rue the day I lost an eBay auction. It was a PR photo with a good looking model mounting a disk in an open drawer of a 2314. If you looked carefully you would see she was holding a 2311 disk. The 2314 pack was probably too heavy to use for all the repeated takes the photographer wanted. 😊

2 years

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RM 380Z software.

by jake utley

I have recently been able to fix my early 380Z blue case however it is a cassette only system and it’s not as simple as adding my spare disk controller so I’m on the lookout for 380 software cassettes or dumps of those cassettes so I can run software on it and demonstrate it at VCF Zurich in January

2 years

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RSX11M installation on real PDP11

by Peter Ekstrom

Hello to the group, I have acquired some boards and a backplane for a PDP 11/23+. The disk controller is an RQDX3 and I have a 3.5" drive that works as an RX50. I have a greazeweasle so I am able to write RX50 images to 3.5 inch floppies. I also have an RD32 MFM drive that also works. Since I have an M8189 CPU board, I have a second serial port that works as a TU58 device so I can use the tu58em emulator. I also have 512K of memory and a DZV11. Using the TU58 emulator I have been able to get RT-11 up and running on it. My goal though is to try and get RSX11M (I have no FPP right now) on it, but I am somewhat at a loss on how to get it installed. Anyone have any suggestions on how I could do that? I have some .tap files and some RL02 images with various versions of RSX11M, but I don't know how to get them onto my RD32 drive. Thanks in advance for any pointers or suggestions. And let me just say I love finally having a real PDP11!! -Peter

2 years

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CDC Cyber 180/8xx PSU

by hupfadekroua

Hi all, after approx 30 years of waiting our time has come to get hands on a Cyber 180/860a. These systems as other systems before are using 400Hz psus. One approach would be to use a 50Hz/400Hz power converter. There are ones on the market creating almost pure sinus output with minimal harmonics. Another approach would be to substitute the old psu by modern ones, possibly by DC-DC converters or switching powersupplies. Does someone have experience in the substitution of psus in the multiple KW range or did this in the past? Best Andreas

2 years

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CDC Documentation and Manuals

by hupfadekroua

Hi all, I do see a lot of CDC documentation on bitsavers like software, hardware concepts, programming concepts, but no logic diagrams, schematics, detailed assembly etc. Didn't publish CDC logic diagrams, schematic, board layouts etc, esp. of course for the 180/8xx series in the past - wasn't such kind of docs ever available? A.

2 years

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Re: Ward Christensen (BBS, XMODEM) has died

by Fred Cisin

1945 - 2024 Found dead 10/11/24 in a "wellness check". Little or no other information yet. Ward Christensen created the first "BBS". Then, when he needed to transfer files, he created XMODEM. The XMODEM protocols became the de facto standard for transferring files. Later, there was some competition from Kermit, but, other than being "FROM A UNIVERSITY!", it wasn't nearly as good. Not only are all of the greats dying off, but soon there won't be anybody around who even knew about them. -- Grumpy Ol' Fred cisin(a)xenosoft.com

2 years

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