Happy 1800 news from Finland!

[Johannes Thelen]

Sorry my long silent, I had so hurry with my "real" job and too few hours for the 1800 project. So I didn't have very much to tell about it...until now!

Last couple weeks I pulled myself back together and I got some results. I assembled whole thing to one piece and got it functional fairly fast, but not without problems... Problems what I faced and solutions:

Couple broken PSU --> new PSUs from MeanWell (I'll repair originals later)

Too eager under voltage protector --> bypassed

Jammed T-Clock --> one SLT card on wrong slot

Parity problem --> Loose connector

6th bit failure in first core array --> dirty sense card (REALLY dirty. It seems dirt on surface conduct enough to mess up sensing)

...and lot more other smaller problems. But finally I managed it to run! As I said in my blog (Finnish), either I'm lucky idiot or 40 years too late from IBM serviceman vacancy ;)

But without help I would have lost years, so BIG thanks belongs to Carl Claunch! And I would lost my mind without ALDs which Bob Rosenbloom kindly send me! Also I want to thanks everyone who helped when this project was just in paper. THANKS!

Of course it is not restorated fully yet, fun is just beginning. I added couple photos and GIF animation when it is running "add one, jump back" program. I'll add videos to Youtube later, but please enjoy these first!

Ps. Merry Christmas!

[Clare Owens]

Hi Johannes,

That is great news!  I was very concerned that you did not receive any ALD books with your machine.  I just sent Carl an 1130 Field Engineering Handbook that I've had since I worked at IBM back in the '65-76 time frame and I also have an 1800 Field Engineering Handbook (120 pages) that I will send to you if you'll send me your mailing address off list.  The handbooks are "pocket size" and have fold out pages with troubleshooting and timing charts as well as lots of other reference materials.

Clare

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[Carl Claunch]

I just received the books sent by Clare and found the handbook to be full of helpful information. Johannes, you should send Clare your address and get the 1800 handbook.

Huge congratulations to Johannes!

Carl

[Bob Flanders]

Johannes,

You have nothing to be sorry about. We appreciate you letting us know
about the status of the 1800, and are pleased to hear that the 1800 is
in good hands.

Many thanks and Merry Christmas!

Regards,
Bob

On Fri, Dec 11, 2015 at 6:46 PM, Johannes Thelen
<johanne...@gmail.com> wrote:
>

[Johannes Thelen]

Hi Clare!

It would be great if you can send that to me! I'm sure I have need for that, I played 1800 last night little bit, and there is still something wrong with it: pressing STOP under program execution can mess the memory at that spot where stop is pressed (I suppose)... I think it is not that complex problem and easy to fix, but any timing diagrams would help lot. Before I continue my project, I'll wait my new oscillosscope with logic analyzer which I ordered last week. Should be tomorrow here and should make my job lot easier.

Ps. I was conserned about the missing ALDs too, but luckily Bob had those. Eventually I found whole rack of ALD/MLD manuals at local computer museum. They have there another 1800 too (only CPU however). I hope I can bring it back to life some day, it is lot easier project than mine, it is in one piece already... I added photo of it, look continous running time: 98.6% over 14 years of service, thats pretty good! :D