Search found 503 matches

by wcass
20 Sep 2020, 23:05
Forum: Workshop
Topic: Bringing the IBM PC XT into the 21st Century
Replies: 331
Views: 42629

Re: Bringing the IBM PC XT into the 21st Century

I draw them out as 2D DXF file and import them into DipTrace. Wait, whole sense card? Does it count as one pin, or it's just "some copper fill" for diptrace? It is multiple "imported object". The entire import does not add to pin count. This is all presuming that you are using a 0.8 mm thick 2 laye...
by wcass
07 Sep 2020, 06:27
Forum: Workshop
Topic: Bringing the IBM PC XT into the 21st Century
Replies: 331
Views: 42629

Re: Bringing the IBM PC XT into the 21st Century

If you used KiCad for the footprints I'd appreciate them :) I am a DipTrace man myself. I don't actually use footprints for the switches. I draw them out as 2D DXF file and import them into DipTrace. This way they don't count against the 300 pin max for the free version. You should be able to creat...
by wcass
06 Sep 2020, 16:01
Forum: Workshop
Topic: Bringing the IBM PC XT into the 21st Century
Replies: 331
Views: 42629

Re: Bringing the IBM PC XT into the 21st Century

What makes me sad is that these projects arrive very close to the end, bright minds work and find solutions, and then suddenly... I am "OK" at "PCB design", and "not good" at "project management" or "promotion". I never planned to "sell" these myself, but did promise to share everything needed with...
by wcass
21 Aug 2020, 22:24
Forum: Keyboards
Topic: Replacement Foam Mat for IBM Model F Keyboards?
Replies: 142
Views: 20336

Re: Replacement Foam Mat for IBM Model F Keyboards?

Most "art foam" is in fact EVA. It is used a lot in cosplay circles because it is (often) colorful and easy to work with. It is sometimes a bit stiff for model F foam, but it worked for me.
by wcass
17 Aug 2020, 03:31
Forum: Keyboards
Topic: Replacement Foam Mat for IBM Model F Keyboards?
Replies: 142
Views: 20336

Re: Replacement Foam Mat for IBM Model F Keyboards?

If you use them, please review them so that i can correct any errors.
by wcass
16 Aug 2020, 05:38
Forum: Keyboards
Topic: Replacement Foam Mat for IBM Model F Keyboards?
Replies: 142
Views: 20336

Re: Replacement Foam Mat for IBM Model F Keyboards?

As laser cutters and services become more ubiquitous, i really should publish the DXF files for these. I had some cut a while back by laser and was very pleased with the quality and price. I will put this on my "to do" list if you guys ask for it.
by wcass
05 Aug 2020, 03:47
Forum: Workshop
Topic: (Model MF) Remodeling the Model M (aka.. the Mara)
Replies: 2147
Views: 174590

Re: (Model MF) Remodeling the Model M (aka.. the Mara)

A basic principal of capacitive and contact keyboard matrix design; rows and columns should intersect exactly once. If they intersect more than once, you will have two switches that produce the same result (at best) or two that do nothing (at worst). Your 121 key matrix will likely be 6 by 21 or 22....
by wcass
02 Aug 2020, 15:45
Forum: Workshop
Topic: (Model MF) Remodeling the Model M (aka.. the Mara)
Replies: 2147
Views: 174590

Re: (Model MF) Remodeling the Model M (aka.. the Mara)

Very little sound is generated by the flipper. Most comes from the spring smacking the inside of the barrel when it buckles - with secondary coming from vibration of the spring itself. Changing the spring will have the biggest impact on sound. I think Ellipse reported this too.
by wcass
30 Jul 2020, 04:45
Forum: Workshop
Topic: (Model MF) Remodeling the Model M (aka.. the Mara)
Replies: 2147
Views: 174590

Re: (Model MF) Remodeling the Model M (aka.. the Mara)

Unfortunately, that is not going to work. There are actually too many things wrong for me to go into it. I'll try to explain how to do it right in a future post. The idea behind this thread is to take an off-the-shelf M and make it an F by swapping out just membrane, flippers, and controller. Changi...
by wcass
16 Jul 2020, 05:11
Forum: Workshop
Topic: (Model MF) Remodeling the Model M (aka.. the Mara)
Replies: 2147
Views: 174590

Re: (Model MF) Remodeling the Model M (aka.. the Mara)

I think "carbon black" is preferred over graphite. It is commonly used as a plastic additive for color and anti-static, but also for capacitive pens at higher concentrations. I did some research a while back, but the manufacturer should know how high they can go given a flipper size and thickness. I...
by wcass
14 Jul 2020, 01:15
Forum: Workshop
Topic: (Model MF) Remodeling the Model M (aka.. the Mara)
Replies: 2147
Views: 174590

Re: (Model MF) Remodeling the Model M (aka.. the Mara)

Injection molding is the way to go. The flipper plastic needs an additive (carbon) to make it capacitive. I'm just going to order a complete keyboard and then disassemble. I will offer the designs up to Unicomp if they want them - if not, i will publish them as open. It would be best if folks could ...
by wcass
14 Jul 2020, 00:34
Forum: Workshop
Topic: (Model MF) Remodeling the Model M (aka.. the Mara)
Replies: 2147
Views: 174590

Re: (Model MF) Remodeling the Model M (aka.. the Mara)

With Unicomp's SSKs shipping any day, if you ask me it's just the flippers that is stopping this project. One can use all of Unicomp's components to build an MF board. PCBs are very cheap, the plastic barrel plate from Unicomp is good enough. The springs on the model M are F are interchangeable (th...
by wcass
16 Jun 2020, 03:18
Forum: Group buys
Topic: interest check Model M to capacitive PCB
Replies: 14
Views: 4690

Re: interest check Model M to capacitive PCB

ACK!
i didn't see that Unicomp announcement til just now.
i have been super busy this year so have had little time for my hobby.
definitely something i would design for, but will need an example to disassemble.
It would be great if we could get Unicomp to offer "capacitive" as an upgrade option.
by wcass
04 Mar 2020, 21:38
Forum: Workshop
Topic: A Smaller Xwhatsit
Replies: 105
Views: 12269

Re: A Smaller Xwhatsit

If [Del] is defined as [Fn+`] then [`] (without Fn) should unequivocally be [`] On the HHKB, if you do [Shift+`] and hold the [`] but let go of the [Shift] what do you get? Which of the below seems more correct? ~~~~~~~~~~~~~~~~~``````````````````````` or ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Have you been...
by wcass
18 Feb 2020, 20:57
Forum: Group buys
Topic: F62+F77 orders now open! New Kishsaver+Industrial Model F Keyboards
Replies: 5574
Views: 691703

Re: F62+F77 orders now open! New Kishsaver+Industrial Model F Keyboards

daijoubu wrote:
18 Feb 2020, 02:57
wcass, it would make sense if the old is 5.5u, so that the other key would be a 1.5u instead of a 1.25u.

At what point did you measure the spacebar? At the bottom length?
Yes, flat across the base of the cap.
by wcass
18 Feb 2020, 01:26
Forum: Group buys
Topic: F62+F77 orders now open! New Kishsaver+Industrial Model F Keyboards
Replies: 5574
Views: 691703

Re: F62+F77 orders now open! New Kishsaver+Industrial Model F Keyboards

So, "old" is slightly smaller than "new". Do you have a caliper?
Perhaps "old" is 5.5u (104.5 mm nominal) and "new" is 5.75u (109.25 mm)?
I am not sure which one i have, but it measures 104.8
by wcass
31 Jan 2020, 06:45
Forum: Workshop
Topic: A Smaller Xwhatsit
Replies: 105
Views: 12269

Re: A Smaller Xwhatsit

The files for USB-C.
As stated, the connector is larger so some things needed to move around. I had to move the Reset switch to the back.
xwhatsit USB-C.png
xwhatsit USB-C.png (54.89 KiB) Viewed 1393 times
by wcass
30 Jan 2020, 02:23
Forum: Workshop
Topic: A Smaller Xwhatsit
Replies: 105
Views: 12269

Re: A Smaller Xwhatsit

i just realized that the width changed. i am sure there was some reason for it, but ... i have no idea why that happened.
by wcass
30 Jan 2020, 02:02
Forum: Workshop
Topic: A Smaller Xwhatsit
Replies: 105
Views: 12269

Re: A Smaller Xwhatsit

I actually did design a version with USB-C connector and one with USB breakout pads. The USB-C connector is larger (in one demension) than micro USB and requires an additional resistor, so i had to move some stuff around and i think that C6 was eliminated because of that. I think i determined that i...
by wcass
29 Jan 2020, 04:08
Forum: Workshop
Topic: A Smaller Xwhatsit
Replies: 105
Views: 12269

Re: A Smaller Xwhatsit

I thought i posted these somewhere, but maybe not. I'm not sure i found the right BOM (it has been 3.5 years). I think this is it, but not sure. Location Type Form Factor C1;C2; 30pF; 0805; C3; 4.7uF; 0805; C4;C7;C8;C9;C10;C11;C12; 0.1uF; 0805; C5; 1uF; 0805; R1;R2; 22; 0805; R3;R6; 20K; 0805; R4;R7...
by wcass
28 Jan 2020, 02:48
Forum: Workshop
Topic: (Model MF) Remodeling the Model M (aka.. the Mara)
Replies: 2147
Views: 174590

Re: (Model MF) Remodeling the Model M (aka.. the Mara)

The dfx file is good to send for plasma/water jet cut from metal. Then put the metal through a slip roll to put the curve in.
Slip rollers are common in HVAC shops.
by wcass
17 Oct 2019, 05:32
Forum: Workshop
Topic: 65% Model F – Open Group Build
Replies: 55
Views: 12236

Re: 65% Model F – Open Group Build

I finally found my cheat sheet with post position measurements on it. There is about 1 mm between caps, so the actual caps are about 1 mm smaller than this. It is marked to .001 precision, but don't believe that. If you are off by 0.1, everything will work fine and no one will notice. I would not be...
by wcass
15 Oct 2019, 19:55
Forum: Workshop
Topic: 65% Model F – Open Group Build
Replies: 55
Views: 12236

Re: 65% Model F – Open Group Build

i think it is worth trying - make the bottom row pads slightly wide to accommodate as many different layouts as we can. We would need one more pin for a new column, though. Any suggestions as to what pin to use? And what pins to use for the TP option - with consideration for routing? Though i sugges...
by wcass
10 Oct 2019, 20:01
Forum: Workshop
Topic: 65% Model F – Open Group Build
Replies: 55
Views: 12236

Re: 65% Model F – Open Group Build

We could make a 3u space bar with posts equivalent to 1.5+1.5 and adjust some things a bit.
Then all of these become available ...
bottom row.png
bottom row.png (6.54 KiB) Viewed 5740 times
by wcass
09 Oct 2019, 20:55
Forum: Workshop
Topic: 65% Model F – Open Group Build
Replies: 55
Views: 12236

Re: 65% Model F – Open Group Build

My fault for not explaining it well. The key cap "value" is not so much a problem - it is possition. Right now, there are 3 possible configurations; ISO Enter and the cap left of that, ANSI Enter and the cap above that, or 1u + 1.25u + 1.5u on the row above. I could "free up" one pad by saying that ...
by wcass
09 Oct 2019, 20:21
Forum: Workshop
Topic: 65% Model F – Open Group Build
Replies: 55
Views: 12236

Re: 65% Model F – Open Group Build

Right now, Enter plus back-slash are using 3 pads; Enter covers two pads, but only uses one (same) pad for sensing in ISO and ANSI config, the second for stabilization, and the third for back-slash - second and third swap depending on ISO or ANSI. Hypothetically, i could use the same column and row ...
by wcass
09 Oct 2019, 01:51
Forum: Workshop
Topic: 65% Model F – Open Group Build
Replies: 55
Views: 12236

Re: 65% Model F – Open Group Build

Split spacebar was seriously considered. It was not selected for 2.5 reasons; Code key caps are rare (you can't order them from Unicomp); the "small" spacebar is 5.75u wide (could not fill this space with just Code key caps); and we have exactly 70 pads already (5x14 matrix - so would need to activa...
by wcass
08 Oct 2019, 03:28
Forum: Workshop
Topic: 65% Model F – Open Group Build
Replies: 55
Views: 12236

Re: 65% Model F – Open Group Build

It may be possible, but it would probably have to be flat. Most keyboards mount the switches flat and use different key cap profiles on each row to give contour. Buckling spring key caps all have the same profile and they mount the switches on a curved plate to give contour. I also don't think that ...
by wcass
07 Oct 2019, 02:29
Forum: Workshop
Topic: 65% Model F – Open Group Build
Replies: 55
Views: 12236

Re: 65% Model F – Open Group Build

The pad card PCB would be 0.8 mm thick - how brittle this is - is worth learning. The bottom plate would be 3d printed, so non-conductive. The smaller footprint for capacitive pads is good to know - i am also working on an MF re-design to take advantage of CommonSense larger matrix support (6x20 mat...
by wcass
06 Oct 2019, 16:53
Forum: Workshop
Topic: 65% Model F – Open Group Build
Replies: 55
Views: 12236

65% Model F – Open Group Build

Manisteinn and I have been chatting since July. I really liked the 3d printed case he designed for a model F keypad and I wanted to test out a few new pad card and controller ideas, so I suggested that we collaborate. Well, we are getting to the point where we need to purchase parts, so I thought it...

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