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For prototyping, I plan to simply snake wires out and onto the bench, at least that's my plan until it doesn't work. I currently have a 10-way ribbon cable snaking out so I can analyse the readout

EDIT/UPDATE...I see from the photos that you've already plugged it in. I hope you had the PCB beveled. :) --------------- First let me say I like this project! I wanted to do it for a long time myself

Thanks for the reminder. Yes, I did manually chamfer the edges before inserting the board, but the reminder is good for anyone contemplating similar experiments. I am unsure how to request chamfered

Real quick... Before you plug that into a scope, make sure your PCB edge is chamfered! Don't plug a raw cut PCB into the scope or you have a good chance of damaging the female connector on the

I have that book! Very much an oversized coffee table type book. It's a fun one. Intel gifted it to us when it was first published. Back when large employers still valued their employees happiness,

Always willing to help. Sell and even loan out extenders I have on hand. Prototype something special you might need. John "Sparky" Nery 3 Springer Ave. Tiverton, RI 02878 WA1ESO@...

The book was a collection of photos taken on 11 July 1997 -all round the world. More info here- http://www.againstallodds.com/odd I think that's a std 13 amp UK type plug and plug board on the ground

Check that all socketed transistors are well seated. My 503 had a dropout that was corrected by pushing a transistor back into the socket. If I recall, the component in question was near the front of

I think the modules in the racks look a bit too complex to be digital modules. Perhaps its not a digital computer but an analogue one? cheers Martin

<davidpinsf@...> wrote: Interesting picture. It looks like they're working on a valve/tube-based computer of some sort, and there's an odd mixture of technology in use. What look like

From Tim P (UK) Early computers, such as Colossus, EDVAC, EDSAC, Whirlwind etc. were built on open relay racks. I wonder if the photo shows a reconstruction, or 'working model' of an early machine.

Great find. Few pictures of these actually performing their job in a real environment. <davidpinsf@...> wrote:

Hi All, Thought folks might be entertained by this picture I found. Currently helping my wife with downsizing her mothers household. Came across this book:

Dom, The filament windings can be left on or taken off. Check the high voltage when they are replaced. Clean the high voltage area to remove dust, dirt, etc. to eliminate leakage paths, if you have

Eric, if I understand correctly, the board you are making for the 7854 isn't a replacement for the 067-0587-xx boards, but something to do with the digital capabilities of the 7854, is that correct ?

Andy, if you need lots of pictures of the cal fixtures let me know I have a -01 and -02 here in the lab. I am also in process for a test board for a 7854. I had a unit arrive today.... destroyed by

Glad it was something so simple and cheap to fix -- just a 555 instead of some left-handed unobtainium hydroxide. -- Cheers, Tom -- Prof. Thomas H. Lee Allen Ctr., Rm. 205 350 Jane Stanford Way

HI Mark, Thanks for your advice. I can see the one's you're talking about on fleabay- they're certainly a good price. I'll be replacing all five because I'd imagine the corrosion that ate through the

Hi Mike, That's terrific- certainly a lot cheaper than the diodes from Digikey. I hadn't seen that site before and it looks like they have some great stuff! I'll have a browse now and I'll let you

Quick update to close the loop. I went through the components related to the NE555 timer and concluded that it was, indeed, a dead IC. I injected a 20.48 kHz signal at the output of the NE555 and the