Search found 274 matches

by tigpha
15 Jun 2016, 09:01
Forum: Workshop
Topic: IBM PC XT -> siXTyPerCent
Replies: 22
Views: 1163

Ok, my simplistic understanding of your explanation is to avoid parallel lines (or surfaces, front to back) on the PCB where sensing is not supposed to happen. Because, capacitors! Of course :-) Would it help to insert a ground line between parallel lines on the PCB? What about ribbon cables? I supp...
by tigpha
14 Jun 2016, 20:07
Forum: Workshop
Topic: IBM PC XT -> siXTyPerCent
Replies: 22
Views: 1163

Hi DMA, Thanks for sharing what you find. I don't quite understand, are you referring to the pairs of traces that run between the pads across the width of the keyboard? I meticulously copied the layout and spacings from an existing PC-XT PCB, and I haven't a clue if the result is electronically soun...
by tigpha
06 Jun 2016, 17:47
Forum: Keyboards
Topic: Anyone interested in an ADC-based capsense controller?
Replies: 71
Views: 5803

For me, the main appeal of this is the cheap off-the-shelf prototyping board that has all the hardware I need for a Model F controller and maybe for a beamspring controller. Much like the Teensy with hasu's or Soarer's firmware. I agree that the single chip solution is very appealing. I also feel t...
by tigpha
06 Jun 2016, 17:38
Forum: Keyboards
Topic: Anyone interested in an ADC-based capsense controller?
Replies: 71
Views: 5803

DMA wrote: ..should I close this thread and move to workshop? Looks like it belongs to workshop.
You will find that instead of one thread, you will need to follow two because both will attract comments at once. I don't think there's any need.
by tigpha
04 Jun 2016, 21:24
Forum: Keyboards
Topic: Anyone interested in an ADC-based capsense controller?
Replies: 71
Views: 5803

Hi DMA, The results so far look really promising. I have enough spare IBM Model F PC-XT parts to reproduce the experiment, except for the PSoC, and the unknown VirtualBox ingredient. I have no excuse really, save for "real life" and "work" and "paying bills" etc... I agree with your opinion of C++. ...
by tigpha
03 Jun 2016, 21:12
Forum: Group buys
Topic: Mini-Groupbuy: IBM Model F "Bigfoots" [shipped]
Replies: 147
Views: 6768

Look out for the square IBM badge: the glue is very likely to have lost adhesion, turned brown and powdery. I recommend poking the badge from inside the case with a blunt implement, through the hole that is situated underneath the badge. I was lucky to notice that the badge was detaching on my Bigfo...
by tigpha
31 May 2016, 21:09
Forum: Gallery
Topic: IBM 3101 Industrial!
Replies: 53
Views: 2558

I have heard say that when the beam springs collapse, it feels like an egg shell cracking under the finger. It seems so delicate and refined for such a hulkingly huge behemoth!
by tigpha
31 May 2016, 20:47
Forum: Gallery
Topic: IBM 3101 Industrial!
Replies: 53
Views: 2558

Thanks for the pictures Alex. You have found a beautifully intact specimen. I am curious to know, since you have a Model F right alongside in the photos, how do these two keyboards compare in sound and feel? I very much doubt that I will find one to try for myself, and I keep hearing enthusiasts ent...
by tigpha
31 May 2016, 20:39
Forum: Group buys
Topic: Mini-Groupbuy: IBM Model F "Bigfoots" [shipped]
Replies: 147
Views: 6768

You're all in for a real treat. There is no hype. Of all the keyboards I have tried so far, these are the pinnacle by a very wide margin. I have not yet found any other keyboard as pleasant to type on, and yet still a practical option for regular daily use. Murium may mention Topre as an equal (or a...
by tigpha
31 May 2016, 18:43
Forum: Group buys
Topic: Mini-Groupbuy: IBM Model F "Bigfoots" [shipped]
Replies: 147
Views: 6768

Hi Kekstee, Try some 2mm thick neoprene foam , it's what I use in my Bigfoots, and here is the hole cutting process , without whacking with a hammer like a maniac. Just a gentle twist with very sharp tools is needed. The neoprene tends to resist sliding, so you may need to insert paper tabs against ...
by tigpha
31 May 2016, 08:39
Forum: Workshop
Topic: Can we design the teensy alternative for keyboards?
Replies: 808
Views: 53815

Hasu, I notice you wrote a comment on the Anyone interested in an ADC-based capsense controller? thread. Do you know if the chip proposed here is capable of capacitive sensing, or CapSense® as Cypress Semiconductors insist on calling it? I'd love to see this project offer support for IBM Model F, an...
by tigpha
30 May 2016, 13:20
Forum: Keyboards
Topic: Anyone interested in an ADC-based capsense controller?
Replies: 71
Views: 5803

It looks as if the VirtualBox version I'm running is 4.3.36 -- I hope that the PSoC Creator is only required to recompile source code, and that there is an alternative method of uploading the binary images. There is a hint that the device can support "mass storage mode" but I've only so far seen a f...
by tigpha
30 May 2016, 11:41
Forum: Keyboards
Topic: Anyone interested in an ADC-based capsense controller?
Replies: 71
Views: 5803

It looks as if I'm ready to rock: PSoC Creator 3.3 Service Pack 2 is installed on the MS-Windows-7 virtual machine. Next step is to get the hardware, and discover if VirtualBox can expose the device to the guest O/S. So far, except for the brain-burp yesterday, progress has been smooth and swift.
by tigpha
30 May 2016, 11:11
Forum: Keyboards
Topic: Anyone interested in an ADC-based capsense controller?
Replies: 71
Views: 5803

Well it seems it was a "fat fingers" or "need sleep" failure: I tried again this morning with a fresh download of IE9.Win7.For.Windows.VirtualBox.zip , and it booted up in VirtualBox, and I was able to activate the 90 day trial period. No idea what has changed over the last few hours. Installing Kit...
by tigpha
29 May 2016, 22:28
Forum: Keyboards
Topic: Anyone interested in an ADC-based capsense controller?
Replies: 71
Views: 5803

Well, I tried numerous VirtualBox appliance images from the Microsoft website, and they all failed. I shall try getting a PC from eBay instead.
by tigpha
29 May 2016, 21:25
Forum: Keyboards
Topic: Anyone interested in an ADC-based capsense controller?
Replies: 71
Views: 5803

Yup, I think that I have found the official VM images at Microsoft . That might be just enough to enable me to do something useful with KitProg. The release notes recommend that "you could take advantage of your virtualization platform’s snapshotting capability so that you can start over with a fres...
by tigpha
29 May 2016, 09:55
Forum: Keyboards
Topic: Anyone interested in an ADC-based capsense controller?
Replies: 71
Views: 5803

Hi DMA, That's unfortunate. No need for you to apologise, it's not your fault in any way. I had read the forum post from someone trying to program the PSoC from a Raspberry Pi, which sounds exactly like the kind of engineer that Cypress really ought to be selling to, but no: "We have not yet tested ...
by tigpha
28 May 2016, 22:46
Forum: Keyboards
Topic: Anyone interested in an ADC-based capsense controller?
Replies: 71
Views: 5803

I've had a look at the Cypress product documents. It certainly mentions CapSense® a lot, and Cypress also offers prototyping kits with capacitive keypad arrays. Farnell sells the CY8CKIT-059 PSoC® 5LP Prototyping Kit for £7.30 plus £3.95 handling charge for orders less than £20 (boo!). Darned it, fo...
by tigpha
27 May 2016, 21:50
Forum: Keyboards
Topic: Anyone interested in an ADC-based capsense controller?
Replies: 71
Views: 5803

So far, only ideas and drawings. The concept is to reuse parts salvaged from an IBM PC-XT, cut down to 60% format, and pierce a few more holes to accommodate the slightly modified layout. If the prototype satisfies me, I will ask a laser cutting shop I have tried a while ago to help with a final des...
by tigpha
27 May 2016, 19:14
Forum: Keyboards
Topic: Anyone interested in an ADC-based capsense controller?
Replies: 71
Views: 5803

Hi DMA, I'm another spectator watching this thread. I have a few IBM Model F rebuild ideas that are missing a suitable controller. This little gem from Cypress might fit the bill very nicely. I don't have the experience of Sensei Hasu in coding such things as TMK, but I am a professional telecoms sy...
by tigpha
11 May 2016, 23:19
Forum: Group buys
Topic: Mini-Groupbuy: IBM Model F "Bigfoots" [shipped]
Replies: 147
Views: 6768

For dirty and cut cable, that's an okay price. As long as nothing is broken besides the cable. Often this is a bad sign: you cut the cable to indicate that the item is broken beyond repair (or not worth the repair). "Beyond repair" did not apply in two out of my three IBM Bigfoots. Cutting the cabl...
by tigpha
10 May 2016, 20:52
Forum: Workshop
Topic: Converting an IBM 5120 Beamspring to USB
Replies: 14
Views: 1455

Looking at the schematics on page 255 of the friendly manual you linked to, in section "Keyboard -- Z4 Socket Pin Assignments" I smell a hint of the same sort of protocol as for the the IBM 5291 terminal keyboard. There's a "Kbd Strobe" and eight "Kbd 1...7" lines too. I suspect the "Kbd O" or "Kbd ...
by tigpha
06 May 2016, 12:53
Forum: Other external
Topic: Great/Interesting Finds
Replies: 22928
Views: 1406337

derzemel wrote: Data General NOVA 2/10 complete system. 8 bids and it's already at 1042 Eur:
Wow! What a beautiful specimen. It looks almost as good as new. And including a punched paper tape reader! Squeal! :o Total vintage awesome!
by tigpha
05 May 2016, 23:39
Forum: Workshop
Topic: Reusing the IBM capsense chip in Model F?
Replies: 1
Views: 222

Reusing the IBM capsense chip in Model F?

Has anyone managed to salvage and reuse the capsense chip in IBM Model F keyboards? It's a chip housed in a square, silver colour can, with about 20 pins on a 5 by 5, 0.1 inch grid. I've seen these inside Bigfoot terminal keyboards and PC-XT keyboards. If I replace the controller chip, such as the 8...
by tigpha
05 May 2016, 23:25
Forum: Other external
Topic: Great/Interesting Finds
Replies: 22928
Views: 1406337

A Model F in Germany the one Zuglufttier laid dibs on, looks to me to be built in Armonk, U.S.A. instead of in the U.K. The U.S.A built ones seem to wear better than their U.K. brethren, suffering comparatively less from rust.

Good luck Zugluftier.
by tigpha
05 May 2016, 23:17
Forum: Other external
Topic: Great/Interesting Finds
Replies: 22928
Views: 1406337

And this one too: Vintage IBM 5160 PC XT

Just like the proverbial buses all turning up at once...
by tigpha
05 May 2016, 23:06
Forum: Other external
Topic: Great/Interesting Finds
Replies: 22928
Views: 1406337

Don't be such a killjoy Seebart. Vintage Osborne Portable Computer in Bury St. Edmunds UK Vintage IBM PS2 Model 80 with Model M, old grey oval logo in Market Rasen, U.K., collection only IBM XT Model F keyboard and possibly an HP keyboard, with screens and 'puter in Bristol, U.K., collection only tw...
by tigpha
01 Apr 2016, 20:30
Forum: Keyboards
Topic: Talented young keyboard designer?
Replies: 9
Views: 797

:-)
by tigpha
01 Apr 2016, 20:22
Forum: Other external
Topic: Great/Interesting Finds
Replies: 22928
Views: 1406337

Oh, hi Blaise, I didn't notice The Three Wyse Boards was your listing.

Guys, buy in confidence, Blaise170 delivers beyond expectation.

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