deskthority

Not yet, but I will begin working on that version and one for the 66-key 3277 shortly. Quick update: For PCB manufacturing, I think I will go with EasyEDA; they seem to offer very good prices, better than PCBWay. This is what the order will probably look like: * Layers: 2 * PCB Dimension Width (mm):...

Really enjoying your pictures recently emdude, they're really nice! Membrane buckling spring living in the shadow of its capacitive brother makes me glsd to see the passion you have for your Model Ms :) Hopefully my photog skills are up to par with yours one day, but until then, here is my most rec...

http://i.imgur.com/TfNrwY9.jpg http://i.imgur.com/t0poN6D.jpg http://i.imgur.com/lntssFu.jpg A bolt-modded Model M frankenboard that I've been using for the past two weeks, a junker made complete with various components from a 1987 1391401 and 2005 Unicomp. It has IBM-style Cyrillic keycaps from Un...

Ground fills have been added, so I think everything has been drawn now. I'll attempt importing the DXF into Diptrace and hopefully produce a working Gerber I can use to order PCBs with. Top layer w/ rows: http://i.imgur.com/XUzhw8z.png http://i.imgur.com/qoqTsbc.png Bottom layer w/ columns: http://i...

I remind you that you can just ignore my input - admittedly it's less risk, "no one was punished by copying [expired] IBM [patents]" :) Yeah.. I appreciate all of the input you've given me, but that sort of redesign is probably outside the scope of this project. I'd be thrilled to just get these ke...

Ohh, huh, that sounds intriguing. Would something like what is illustrated in this crude drawing work then? Or could it be simplified even more? http://i.imgur.com/a5nf0fB.png I poked around a bit and did find some posts by xwhatsit, one where he provides a screenshot of IBM's beam spring/capacitive...

Yes, but only the amount of charge collected on the receiving pad is measured (bottom column pad for xwhatsit, row pad in CS. The result is about the same). top-bottom column pads is a series capacitor, so it only impedes charge transport. I'm suggesting to short it out. Also I like to think about ...

Make vias in the overlappiong pads to connect them. This will make signal ~2x stronger when the pad is resting on PCB, which will improve SNR. Calibration pads will probably need to be enlarged if you want xwhatsit autocalibration to work. Thank you very much for posting, DMA, that is an interestin...

Model F AT with a starting bid of $49.00: http://www.ebay.com/itm/Vintage-IBM-AT-Keyboard-with-tactile-and-audible-feedback-/122583331321?hash=item1c8a8931f9:g:lGIAAOSwjRpZXRT9 Yes! I'll probably bid on that one, seems like a good deal and first Model F AT for me. Unless someone else wants it? I do...

Congrats on the finds! That SDL connector is pretty nifty, would be neat if that were the standard one used for Model Ms.

@ipreferpie, after looking at Sangdrax's post, I took a closer look at your PCB.. Seems like a realistic proposition since the traces are routed much more cleanly than on my 3277. I was able to map the matrix out pretty easily. :) I still plan to continue with my efforts as I wish to avoid a potenti...

A small update: I tested the PCB measurements with more printouts and discovered I was in error in regards to the key spacing. The 19mm measurement that wcass provided me is the most accurate one. I have corrected the horizontal and vertical key spacing and uploaded a PDF. If you guys could print it...

No, the photos with your industrial ruler look fine. Please check the PCB with a printout of the PDF when you can though. It seems that the distance between the two pads differ by at least a millimeter. Based on my PCB, the center-to-center distance should be 35mm. Depending on whether the other 66-...

A Sharp PA-1050 that I picked up from Goodwill today. The switches aren't great--Alps Integrated Domes. The caps are nice though, Alps Electric WoB Doubleshots in a relatively sane layout (for a typewriter, anyway). Has fun special characters that are also doubleshot and some rimless pad-printed fro...

I have one with a bottom date code starting 76xxxxxxx, yet the top case is stamped 1982 inside, along with a second stamp from Polytech Coatings, which I assume to be the name of the company that applied the finish to the case itself. Seems that either I am decoding the date incorrectly or mine was...

@ipreferpie, here's a 1:1 scale PDF of the new PCB. I think we've hit a snag; it appears that the distance between the Enter key pad and the rightmost pad of the set of four is smaller than on the full-sized 3277. This might be a problem, I'll need to see more pictures/measurements of another 66-key...

Nice catch WRT the number! Shame about the missing label though.

I've been fascinated by the 1390359 for a while now. There was one on eBay two or three months ago that I was thinking about getting, but I ended up passing on it.

Thanks a bunch for the photos!! Very interesting that this version of the PCB features not one, but three extra pads! Makes me wonder what the other variants of the 3277 look like. :) Fortunately, from a glance, it seems that set of four pads appear to be spaced 1u apart, so placing them will not be...

Looked like a great time, I would love to go through a treasure trove like that.

The typewriter in the top-left is an IBM Electronic Typewriter. That for sure is very interesting, I know alh84001 here would be very interested in picking up the keyboard assembly!

Small update: I don't think the column "shield" should be overlapping the row pads, at least from what I can tell from other beam spring and capacitive buckling spring keyboards... Might lead to unwanted capacitive coupling or something (not an EE, clearly)? May have to take another look at the colu...

Taylorswiftttttt kindly proxied one of these keyboards for me! I cleaned it up, bolt-modded it, and changed the modifiers to something more ANSI-ish in the process. Pardon the potato pics! http://i.imgur.com/gukaGVW.jpg In my research about the keyboard, orihalcon suggested an 8-pin SDL IBM 54P8828 ...

Unicomp did use the old legends up until a couple of years ago. Several of their product page photos feature keyboards or keysets that use them. I personally ordered two different custom keysets with older legends, one with SSK legends and the other with English-Cyrillic. I posted photos of the form...

As far as getting keys printed form etsy, keep in mind that the font files will become open source at some point so if you can find a vendor who will accept artwork, I would think you stand a good chance of getting a close match. I would also be happy to assist working up the artwork for extra keys...

Thanks kuato and orihalcon, I noticed that height difference as well in one of the 3278 PCB images I've been using as reference. http://i.imgur.com/uCubF.jpg I'm guessing there's a schematic floating around that gives the specifics of that connector somewhere. Another part number I've seen is 805-60...

Emdude, I can send you a connector if you want to take detailed measurements of how that would fit. I have an analog caliper and can get you the thickness of a couple beamspring capsense PCBs and see if there is much variance there in the originals over a couple of beamspring models. Let me know if...

Oh, sorry for not being clear, I meant that I should be able to add the extra key without redesigning the matrix, I've added this to the OP:



I can add the key at C4.

Sure! I would have to modify the matrix to accommodate the additional key so the sooner you can get the photos and measurements, the better!

EDIT: Actually, the matrix as-is should be able to accommodate the extra key without issue.

I have completed an initial drawing for the top row pads as well as the bolt holes and attached a full-sized SVG and PDF. If anyone with a 3277 would like to print out and test the drawing, I would appreciate the extra feedback. I also updated the row/column key spacing, using a 19.125mm spacing now...

Wcass gave me the measurements of your 5251 beam spring and I used some of those measurements for my CAD drawing. There are enough owners of 78-key 3277s that I can run a GB for at least 5 PCBs through PCBWay or EasyEDA so finding people is not an issue. I was planning to take the risk of the PCBs n...

I wish that these pcbs would work but there is the 3277 mini beamer and the normal bigger one, the pcb is for the bigger one and not the 66 key one. But I think orihalcon is working on a replacement pcb for this one. If there is any way to help him he should message us but I guess that my knowledge...