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 you
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 the 4051 creates a smile
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 interfaces.
>> Marc
>
> Do you have the M/E/F-
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, curiousma...@gmail.com wrote:
> Episo
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 series of HP manuals
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 other manuals, and I don't h
> 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? If so, how
many? I ha
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, much to our surprise, the mu
> 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, but
> eliminated th
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
> http://www.righto.com/2016/07/restoring-y-combinators-xerox-alto-day_31.html
> Marc
>
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 augustus 2016 21:08
>>
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 current and connect it
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 failure in the Psu can
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, a
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 L
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 really enjoyed the
> videos of VCF East I
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 of old test equip at t
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 across it I'll come back to yo
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.
>
> http://hackaday.com/2016/07/05/don-eyles-walks-us-through-the-lunar-module-s
> ource-code/
>
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 quite knowledgeable group of
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
> and Laser Writer
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
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 paper tape
>> punch inte
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
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.
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 you process (image) 9-track tape?
>
> Not a
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 those cases available? I'd
>> like to get my
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 .IMD diskette archive files
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, 20
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