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Seeking Remex RRS3300 Paper Tape Reader info

by David Wise

I was given a Remex RRS3300RB5/550/DRA/S358 back around 1999. This 300cps machine uses a capstan and brake instead of a sprocket. The 180ips spooler is AC motors, triacs, brakes, tension arms loaded with microswitches (including a discrete differentiator), six relays, and a soft-start ramp. In spite of the ramp, the spooler was murderous, snapping tape after tape. After some modifications and adjustments I got it working pretty well, but I don't like that I had to change it. I never found a manual, and it has always bugged me. Does anyone here have anything? I have a manual for the RRS3301 which has a similar reader section but the spooler (my sore spot) is completely different. I have a manual for the RTS3300 S239 which is a custom-mod to fit in GE CNC systems of the time. It has no reader electronics, and a spooler that shows common ancestry but again it's not like mine. Thanks, Dave Wise in Hillsboro Oregon To be specific, I made two changes and found a set of resistor settings that treats the tape gently. The changes are (a) eliminate continuous takeup during the startup ramp, (b) block the transition to full speed. The soft start board simply ramps up to maximum and stays there. I made it easy to back these changes out if I ever find out how to make the instrument behave in stock trim. What is my 358 custom mod?

10 months, 2 weeks

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Vintage computing in the San Francisco bay area

by anders＠abc80.net

Hi, Soon I will travel to US and San Francisco/San José Area. Any tips for vintage computing and surpuls electronics? CHM is manatory, I'll go there. It would have been nice to see the PDP-1 in action, but I suscpect that we will not make it when it's demonstrated. /Anders

10 months, 2 weeks

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VCF West Aug 2 & 3, 2024 - Mountain View, CA

by Jeffrey Brace

Hello folks, We're less than a month away from shutting down exhibit and speaker registrations for VCF West. The July 4th weekend represents the end of both so I can use the rest of July to get the program built, get the floorplan finalized, create schedules, etc. So if you've been waiting to get your exhibit or talk registered, wait no more! We still have room for both, but I can't promise that will last all the way until July! This year's show is already shaping up to be a great one so you don't want to miss it! As always, details are at https://vcfed.org/events/vintage-computer-festival-west/ Attendee ticketing information and pre-orders will be posted soon. If you have any questions, comments, concerns or -especially- if you would like to volunteer to help with the show, please let me know at this email address. Thank you! Erik Klein VCF West Showrunner

10 months, 2 weeks

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teletype roll as an RF termination load

by Fritz Mueller

So, I recently salvaged a pair of ASR 33s and a PDP-8/I from a research lab where I work. A few folks chimed in on the "anybody want this" thread, but I happened to be the lucky winner (not lucky for my back or my basement, but they will be fun restoration projects.) One of the engineers here asked if there were any teletype rolls along with these and if so that they be salvaged because "...it is broadly lossy to rf and can be used as an rf termination load." When asked a little further if this was teletype rolls in particular, she replied yes, and that this was something she had picked up in former work as an RF engineer at Varian, from a previous generation of crafty engineers. I thought this was pretty interesting, and that the list here might have a cross-section of folks who might comment. Anybody heard of this before? Hmmm, teletypes *and* RF -- sounds like something Marc might want to check out... :-) cheers, --FritzM.

10 months, 2 weeks

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Re: Illiac II Library Routine

by Marvin Johnston

First, the date of the report is January 13, 1967. I don't plan of offering the report for sale. Once I find a good way of duplicating the report, I most likely will put the copies on a thumb driver and offer them for sale most likely for the price of the thumb drive (1 or 2 dollars.) If bitsavers wants copies, that would be great since it (they) will be available at no charge. Thanks for asking! Marvin > From: Bill Degnan<billdegnan(a)gmail.com> > Subject: [cctalk] Re: Illiac II Library Routine > > > Marvin > Are these for sale or are you bringing to exhibit? What year was the Iliac > II library routine published? I will be at VCFMW this year. > Bill > > On Tue, Jun 11, 2024, 11:26 AM Marvin Johnston via cctalk < > cctalk(a)classiccmp.org> wrote: > >> Thanks for the offer,but I'm located in Santa Barbara, CA. My plans >> include VCFMW in September where I can bring a slew of his books, etc. >> I might add there are some IBM manuals including the 360 and 1401 >> Fortran II I've seen so far. >> >> Marvin >> >>

10 months, 2 weeks

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Dilog Multifunction MQ-100 board

by Douglas Taylor

Hopefully I can find someone who has a manual for this qbus board, if not, does anyone have experience with this board? Summary: It's a dual width qbus board with 1 DLV11-J port, 32KW Boot room, on board LTC circuit and has a 16 pin connector to attach to a front panel. I dumped the prom's and you can see them over on the VCF Forum/DEC page. I used PDP11GUI to probe the I/O space and it looks similar to a MXV11-B boot board, with the addition of a serial port, LTC and front panel control. The board has copyright 1986 so it's not that old. I guess a front panel would have; LED for RUN, LED for DC OK, a switch for HALT, switch for RESTART and possibly a switch to disable LTC. The board has a couple of 4N25 optocouplers and what signals would need isolation? Yes, I would like to use this put together a working qbus PDP11 using either 11/23 or 11/73 CPU, just for fun. Doug

10 months, 2 weeks

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Illiac II Library Routine

by Marvin Johnston

A friend of mine passed away about a year ago, and his wife is just getting around to sorting through his many books, papers, etc. The title of the heading title is what caught my attention. My current plan is to scan the 9 page paper and make it available to interested parties. Since me my plan is to bring many of his books/manuals to VCFMW in September. The identification is "A complete NICAP program which does matrix arithmetic." The heading is: University of Illinois Graduate College Department of Computer Science Illiac II Library Routine F1-UOI-MTRZAL-82-NI After I get it scanned, I will submit it Bitsavers and give the original to the Computer History Museum. There may end up being more such papers as his stuff continues to be sorted through. Marvin

10 months, 3 weeks

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Re: Experience using an Altair 8800 ("Personal computer" from 70s)

by brianb1224

😀

10 months, 4 weeks

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Re: Experience using an Altair 8800 ("Personal computer" from 70s)

by brianb1224

If I had his digital basement I would never come out.

10 months, 4 weeks

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Richmond Retro Computer Meetup - Sat. Jun. 15, 2024 - Richmond, VA

by Jeffrey Brace

Richmond Retro Computer Meetup Sat. Jun. 15, 2024 at the Richmond Public Library in Richmond, VA https://www.meetup.com/richmond-retro-computers/events/301122005/?utm_mediu…

10 months, 4 weeks

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