Re: Cleaning RK05 packs (Was: LGP-30 Memory Drum Update)

We use 6"x6" clean room rated wipes (I think they were either Berkshires or Kimwipes) from Grainger and 99% isopropyl alcohol from Fry's. Won't scratch, free of microscopic dust and lint, and 99% alcohol will leave no drying marks (it's typically the last rinse in IC manufacturing). May cost

Re: Tek 4051 with a 10 year old at the helm

Sweet! Marc > On Nov 4, 2016, at 5:03 PM, Randy Dawson wrote: > > Here is my daughter Gina, I thought you guys would like, Tek is still > exciting. > > > Sure, we have lots of PC's around the house, but this is the first one that > she is programming, and programming

Re: HP-1000 12044A 12825A HDLC Interface manuals available anywhere?

I have only the M/E/F interfaces (HP 12825A and 12826B). I just dumped the ROMs and forwarded to Al. Marc > On Oct 28, 2016, at 6:56 PM, Glen Slick wrote: > >> On Wed, Oct 26, 2016 at 9:25 PM, Curious Marc wrote: >> I'm interested too, I have the

Re: Y Combinator is restoring one of Alan Kay's Xerox Alto machines

And it finally boots on session 8! https://youtu.be/9OQMhvArI9g > On Sep 10, 2016, at 7:46 PM, CuriousMarc wrote: > > Video of session 6 is up: > https://youtu.be/b7yVhMT7tr4 > Found our first bad IC. Probably not our last one. > > > On 9/3/16 11:08 PM,

Re: HP 7970B/E Tape Unit manual available

That would be great, as some of the pages in the current manuals or bits of the schematics are missing. And for some reason it is always the page I need that's missing! Marc > On Sep 22, 2016, at 10:32 AM, Al Kossow wrote: > > for people that care, I'll be rescanning that

Re: HP 7970B/E Tape Unit manual available

I'll gladly take them if they are still available. Let me know how much the shipping is to California. Marc > On Sep 22, 2016, at 8:43 AM, Noel Chiappa wrote: > > Hi, all, I have a HP 7970B/E Tape Unit Diagrams and Parts Manual available; I > got it with a group of

Re: Y Combinator is restoring one of Alan Kay's Xerox Alto machines

> On Sep 7, 2016, at 4:18 PM, Josh Dersch wrote: > > Yep, the NEC uPD416D's are what we have in the Alto we recently restored. > And yeah, it takes awhile, but it's worth the effort :). > > Have fun! > - Josh Out of curiosity, did you find any bad RAM chips in your system?

Re: Components available - the rest of the story

I might be interested, as I already have two FFT systems that I am restoring (an HP 5420A and a HP 5451C). I am local. Just drop me an email. Marc Sent from my iPad > On Sep 8, 2016, at 10:08 AM, Tom Gardner wrote: > > The rest of the story. > > As Al pointed out,

Re: Y Combinator is restoring one of Alan Kay's Xerox Alto machines

> On Sep 5, 2016, at 9:30 AM, Josh Dersch wrote: > > At the LCM, I used an Apple II to test out the Alto's memory -- the Alto II > XM uses 4116 RAM chips. I swapped in a row at a time and wrote a little > BASIC program to test for obvious errors. This was time-consuming,

Re: Y Combinator is restoring one of Alan Kay's Xerox Alto machines

Episode 5, still does not boot, but we are starting to follow long why: https://youtu.be/Wr7vDZpniNIr Marc > On Jul 31, 2016, at 6:12 PM, CuriousMarc wrote: > > Next Episode: > https://youtu.be/EDw8U1a6s78 >

Re: Flex Disc options for the HP 9825

Thanks. That's a very clean mod! Marc > On Aug 15, 2016, at 7:35 AM, Rik Bos wrote: > > > https://flic.kr/p/L8SNPJ > > Done. > > -Rik > >> -Oorspronkelijk bericht- >> Van: cctech [mailto:cctech-boun...@classiccmp.org] Namens Curious Marc >> Verzonden: zondag 14

Re: Flex Disc options for the HP 9825

Thanks! Marc > On Aug 13, 2016, at 1:19 PM, Rik Bos wrote: > > Marc, > > Building a crowbar is easy, just take a Zener a little higher than the psu > voltage eg 5.2V for 5V rail put a resistor of 1k in series take a Thyristor > big enough to take about 150% of the schort

Re: Flex Disc options for the HP 9825

Thanks for the info. Any schematics of the modification? Marc > On Aug 13, 2016, at 2:37 AM, Rik Bos wrote: > > > For what it's worth a small warning about the HP 9825 series computers. > The power supply doesn't have a crowbar(over voltage protection), so a > transistor

Re: Flex Disc options for the HP 9825

I got the HP 9885 single sided disk unit that was at Weird Stuff, thanks for the heads up! Now I just need a parallel interface for the 9825, a cable, the right 8" diskettes, and get my HP-IB 9895 to work... That's a lot of stars to align but that should be fun to try. Marc > On Jul 24, 2016,

Re: the value of old test and repair equipment

For some reason the 7474's have a higher failure rate than other TTL IC's in HP equipment. I don't know if it's true in general for 1970's TTL. Signetics MSI chips (counters and stuff) seem to be prone to failure too. Marc > > All this talk of older test equipment reminds me of the HP 4261A

Re: VCF West - going?

I'll try to post a video on my channel (youtube/curiousmarc). Maybe not the whole thing, but the stuff that is interesting to me. Marc > On Aug 5, 2016, at 4:38 PM, Brad H > wrote: > > > > Is anyone shooting video for those of us that can't go? I

Re: the value of old test and repair equipment

Yes, quite interested, HP test equipment is a significant part of my collection. Most of what I get is untested. Would need model number and photos of course. Marc Sent from my iPad > On Jul 28, 2016, at 12:52 PM, Electronics Plus wrote: > > I had to pass up a large qty

Re: Flex Disc options for the HP 9825

Thanks for looking! Marc > On Jul 24, 2016, at 3:30 AM, David Collins wrote: > > Guys, I've looked for a 98228A ROM in the HP Computer Museum but haven't > been able to find one - but it looks like we've had one at some stage > judging by the photo. > > If I come

Re: Lunar Module Code Walk Through

Wow. Talk about a historically significant computer system and program. I'd love to make a replica one day. Thanks! Marc > On Jul 5, 2016, at 7:28 AM, Dave Wade wrote: > > I guess this is on-topic. > >

Re: Y Combinator is restoring one of Alan Kay's Xerox Alto machines

And here is Ken's new post in the series http://www.righto.com/2016/06/restoring-y-combinators-xerox-alto-day.html Marc > On Jun 21, 2016, at 10:59 PM, CuriousMarc wrote: > > The restoration is physically happening at my place. As noted below we have > a small and

Re: Macintosh Quadra 840AV

I just use a relatively recent SCSI drives with an adapter plug back to 50 pins. SCSI 1 is still lurking in the interface, works just fine. Marc > On Jun 1, 2016, at 9:11 AM, Cody Swanson wrote: > > I managed to pick up a Mac Quadra 840AV yesterday with an apple VGA monitor >

Re: News about hpmuseum.net

This is great news despite the sorrow. Thank you for that, the museum is such an awesome resource for HP collectors. I saw your video on the 2116 restoration were both Jon and you appear. We have at least one more at the CHM, just as a static display for now. I hope I can visit you in Melbourne

Re: Facit 4070 to PC interface

Thanks for the link! I didn't know about it. Looks like a pretty straightforward trick, very helpful. Marc > On May 4, 2016, at 8:32 PM, Bob Rosenbloom wrote: > >> On 5/4/2016 5:52 PM, Charles Dickman wrote: >> Has anyone ever worked up a PC parallel port to Facit 4070

Re: Very sad message: the passing of Jon Johnston

You can see him in the YouTube video he posted at the beginning of the month about his HP 2116 restoration. Very sad indeed. https://youtu.be/Kko526UpHsM Marc

Re: [OT] Alternatives to eBay

I haven't look at Craigslist much. Isn't it more oriented to geographically local sales? Can you setup search alerts like on ebay? Marc On Apr 20, 2016, at 10:36 AM, et...@757.org wrote: > Craigslist is the one big eBay alternative.

Re: Anyone have DIBOL-11, CTS-300, or CTS-500?

All of my 9 tracks are working right now, I could give it a try. I can only read 1600 and 6250 bpi. Contact me off list if interested. Marc > On Feb 16, 2016, at 11:23 PM, Eric Smith wrote: > >> On Mon, Feb 15, 2016 at 5:17 PM, Jason T wrote: >> Can

Re: PRM-85 board case?

Interested too. Marc > On Feb 6, 2016, at 9:43 PM, Glen Slick wrote: > >> On Sat, Feb 6, 2016 at 2:31 PM, Jay West wrote: >> Rumor has it that one or more people have designed and 3d-printed cases for >> their HP-85 PRM-85 boards. Anyone have any of

Re: .IMD diskette image file recovery

Yes, if you download the original imd, in the package there is a simple to use command line utility to do just that. Writing from memory, IMD2BIN.EXE or something like that. Marc > On Feb 3, 2016, at 4:56 PM, Jim Simpson wrote: > > Is there a utility that will read

Re: Character ROMs for HP 2631G printer / 264x terminals

No, but I have an HP 1670G, does the same trick. I also managed to install it as a printer on Windows 98 using a GPIB ISA card and National Instruments DOS drivers. Even had the choice of 14 7/8 inch fan fold paper in the printer dialog! I'm working on a nicer HP only demo. Marc > On Jan 19,