Search found 523 matches

by DMA
30 minutes ago
Forum: Workshop
Topic: xwhatsit beamspring converter board "not found"
Replies: 4
Views: 160

Re: xwhatsit beamspring converter board "not found"

Why would you do that in 2019? CY8CKIT-059 is 5x cheaper and supports literally everything (except parts of macro engine which didn't strictly work anyway). "USB device not recognized" is "it's powered on, but something strange comes off data pins". Check the signal train from USB socket to the main...
by DMA
57 minutes ago
Forum: Workshop
Topic: Scanning a cortron Diablo keyboard
Replies: 1
Views: 137

Re: Scanning a cortron Diablo keyboard

I happen to have 3 cortrons laying around. In one, I've got permission to replace the MCU and keep the driving logic because I couldn't figure out the analog part, really. Especially puzzling is the output from MCU which feeds back into the analog part depending on the previous key state. .. I almos...
by DMA
14 Jul 2019, 03:36
Forum: Workshop
Topic: Univac Keyboard (Micro Switch)
Replies: 51
Views: 2538

Re: Univac Keyboard (Micro Switch)

This looks pretty close to cortron switches - including the driving electronics. Have you tried to reverse-engineer the driving electronics for it? I'm trying to replace the central MCU in one of those, but couple of keys are not pressed reliably and I can't understand is it because of the keys bein...
by DMA
13 Jul 2019, 04:33
Forum: Workshop
Topic: Beamspring Factory process - How to
Replies: 30
Views: 2168

Re: Beamspring Factory process - How to

Needle-nose pliers are da shit. As for the bending tool - plastic is likely too soft for that. Metal will probably deform it. Also this being spring steel - to give it a shape you must bend it _beyond_ that shape. And if it's not - it might have trouble holding the shape for long. I like the idea of...
by DMA
29 Jun 2019, 17:41
Forum: Workshop
Topic: IBM Model M buckling spring switch bounce oscilloscope measurement
Replies: 13
Views: 939

Re: IBM Model M buckling spring switch bounce oscilloscope measurement

trigger on falling edge, have a resistor (not small - 10K would be OKish) between switch output and ground, half-second screen length (50ms/div I guess?).
That should tell you an overview - does it happen or not. Then you can go and zoom in horizontally
by DMA
20 Jun 2019, 16:38
Forum: Workshop
Topic: IBM 5251 Beamspring with DMAs CommonSense
Replies: 7
Views: 627

Re: IBM 5251 Beamspring with DMAs CommonSense

there are "exp header" pins - those should go to solenoid board
by DMA
02 Jun 2019, 04:33
Forum: Workshop
Topic: Alternative capsense patterns testing
Replies: 10
Views: 695

Re: Alternative capsense patterns testing

@numist why it's wild? you have 2 capacitors in series, you short one out - your total capacitance increases :) 4x is not all that unexpected - electrode gap is the denominator in the capacitance formula. Just by firmly pressing the flipper to PCB you'll get noticeable increase in readings. Ground s...
by DMA
19 May 2019, 23:05
Forum: Workshop
Topic: Beamspring Factory process - How to
Replies: 30
Views: 2168

Re: Beamspring Factory process - How to

Sorry for hijacking the thread, SneakyRobb. CS is (at least in my beamspring) quite a diva and disassamble the beamspring every other day and clean it to avoid severel "hickups" is annoying. What are your symptoms? Keys not registering, repeats, something else? What are your thresholds? Must be abou...
by DMA
19 May 2019, 22:49
Forum: Workshop
Topic: [Done] CommonSense controller - better capsense!
Replies: 411
Views: 31792

Re: [Done] CommonSense controller - better capsense!

It didn't matter so far which side you drive. But for those switches it may. But since you tested both ways and they seem not to differ - drive rows, because only 8 driving pins are possible right now. It's not that it's hard to add more - but since all pins must be assigned it will require 100-pin ...
by DMA
15 May 2019, 06:46
Forum: Workshop
Topic: [Done] CommonSense controller - better capsense!
Replies: 411
Views: 31792

Re: [Done] CommonSense controller - better capsense!

Windows binaries are in releases section. https://github.com/dmaone/CommonSense/r ... tag/v0.2.1 supposed to be latest.

What are linux build errors?
by DMA
13 Apr 2019, 21:15
Forum: Workshop
Topic: Restoring&Converting the IBM 4978 Beamship
Replies: 29
Views: 1996

Re: Restoring&Converting the IBM 4978 Beamship

I see. You may have to tape small pieces of foil over the unused key pads. Beamspring keys lay on the pads at rest, so empty ones can appear always pressed (if empty pads read zero). For new designs it's less of a problem, you just need to make a 3x3mm square pads on unused matrix cells - row on one...
by DMA
13 Apr 2019, 19:14
Forum: Workshop
Topic: Restoring&Converting the IBM 4978 Beamship
Replies: 29
Views: 1996

Re:

Noobmaen wrote:
17 Dec 2018, 14:36
The restoration process is finally finished, here are pictures of the result. ImageIMG_3133
Do those top button have lamps in them?

Also please post matrix monitor screenshot and hardware settings.
by DMA
07 Apr 2019, 20:43
Forum: Workshop
Topic: [Done] CommonSense controller - better capsense!
Replies: 411
Views: 31792

Re: [Done] CommonSense controller - better capsense!

To me, a comparator is simpler than a multi-bit ADC, and my interests are in leaning things in that direction. It's simpler*. Problem is it doesn't really work. You need to know thresholds - or use ADC to get them at runtime, in which case not only you dragged ADC in, you also dragged in a DAC to s...
by DMA
06 Apr 2019, 20:25
Forum: Workshop
Topic: [Done] CommonSense controller - better capsense!
Replies: 411
Views: 31792

Re: [Done] CommonSense controller - better capsense!

keeping to how IBM did things. It was like.. seventies. 5267 is somewhere around base S370 on the RAM front and faster than most if not all of the family. Tradeoffs were different and much more attention was paid to design - like every column on that model F PCB is impedance-matched with GPIO it's ...
by DMA
06 Apr 2019, 05:15
Forum: Workshop
Topic: (Model MF) Remodeling the Model M (aka.. the Mara)
Replies: 2077
Views: 104744

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

Since no one has weighed in on the "stock" CommonSense default bonus function layer configuration... I would personally like to have the right side extra "Windows" key location between Alt and Ctrl mapped to a Fn type key, and the default layer for that could have media keys in the following locati...
by DMA
04 Apr 2019, 02:04
Forum: Workshop
Topic: [Done] CommonSense controller - better capsense!
Replies: 411
Views: 31792

Re: [Done] CommonSense controller - better capsense!

I've downloaded Cypress PSoC Creator and had a look at what I'd downloaded of the CommonSense design. It seems to open the BLE01_USB project while I wasn't looking for a Bluetooth design per-se, but I'll presume how the capacitive matrix is handled is independent of the host interface. Probably bec...
by DMA
31 Mar 2019, 23:34
Forum: Workshop
Topic: Designing a custom Topre board
Replies: 128
Views: 43201

Re: Designing a custom Topre board

Oh, btw. I have a topre on my table with controller replaces by CommonSense. I mean, _completely_. No active components from original keyboard.

The only problem is you need to get switch mechanisms from somewhere.
by DMA
31 Mar 2019, 23:28
Forum: Workshop
Topic: (Model MF) Remodeling the Model M (aka.. the Mara)
Replies: 2077
Views: 104744

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

The one bit I’m unsure of is it’s ability to reliably complete the circuit. Testing will tell, but we do have less contact area now on the PCB. Nope. Contact area stays the same - get some ink on the flipper bottom, drop it onto a paper sheet. So, spring/legs side being "top", everything "above" th...
by DMA
31 Mar 2019, 23:04
Forum: Workshop
Topic: (Model MF) Remodeling the Model M (aka.. the Mara)
Replies: 2077
Views: 104744

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

One of the first things I think we order is @DMA’s CommonSense controller. We will likely get a reasonable amount of them (more than we will need for our MF run) so we have on hand for future projects. Then we can design PCBs, cases, and the like around it’s tiny footprint and our connector. Not mu...
by DMA
16 Mar 2019, 03:13
Forum: Workshop
Topic: Odd problem with IBM Model F
Replies: 11
Views: 697

Re: Odd problem with IBM Model F

Here are a couple more photos. The white stuff on the pcb was some remnants of the old foam which I have now removed. The other photo is of the Teensy running Soarer's converter and connected to the original cable using a 5-pin din socket. First photo without the metal, then the reverse of the same...
by DMA
16 Mar 2019, 03:08
Forum: Workshop
Topic: (Model MF) Remodeling the Model M (aka.. the Mara)
Replies: 2077
Views: 104744

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

Flat PCB works with no modifications - CSSK is the living example.
by DMA
02 Mar 2019, 03:49
Forum: Workshop
Topic: Broken microcontroller: what to do next
Replies: 7
Views: 526

Re: Broken microcontroller: what to do next

drag-soldering QFN? That's hardcore. It _could_ be a dead GPIO, but it's likely a short somewhere in the PCB. Dead GPIO is usually one of the rails (usually ground because ground it easier to short to). 0.7V is usually a short to the ground somewhere far away from the MCU with a GPIO struggling but ...
by DMA
02 Mar 2019, 03:35
Forum: Workshop
Topic: Beamspring 3278 XWhatsit and sporadic random keypresses
Replies: 8
Views: 493

Re: Beamspring 3278 XWhatsit and sporadic random keypresses

em_dude's PCB? Get a piece of a dense cardboard and sandwitch with PCB into the connector. Doesn't work for original PCBs - those have rows on one side and columns on the other. Use away from (means "on a different power strip from", too): LED lights, dimmers, LED dimmers(special mention because tho...
by DMA
01 Feb 2019, 03:33
Forum: Workshop
Topic: (Model MF) Remodeling the Model M (aka.. the Mara)
Replies: 2077
Views: 104744

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

mattlach wrote:
01 Feb 2019, 02:13
wcass wrote:
01 Feb 2019, 02:06
I think it would be great if we could work with Unicomp; like the way that AMG works with Mercedes.
Has anyone ever tried to reach out to them?
I do remember we have at least one Unicomp guy at this forum.
by DMA
28 Jan 2019, 01:29
Forum: Workshop
Topic: wcass' Compact SSK: a review, reverse engineer, teardown, geek-out.
Replies: 45
Views: 2934

Re: wcass' Compact SSK: a review, reverse engineer, teardown, geek-out.

PCB strips it is, then? God no. Strips will make much worse wiring mess. 0.8 is fine - model Fs still work after all those years and IBM didn't even care to bend them. You don't need 4 layers unless you ABSOLUTELY must make it frameless (or plastic - so you must bring your own ground plane). Even t...
by DMA
27 Jan 2019, 21:37
Forum: Workshop
Topic: wcass' Compact SSK: a review, reverse engineer, teardown, geek-out.
Replies: 45
Views: 2934

Re: wcass' Compact SSK: a review, reverse engineer, teardown, geek-out.

My soldering is so shitty LOL. But hey, it works. SNR - wcass decided not to put vias between the floating pad and the pad behind it. With vias signal would be another 2x-4x stronger. Not that it's needed.. but I woudln't turn away from extra 6dB. If nothing else it would allow to drop ADC resolutio...
by DMA
13 Jan 2019, 22:19
Forum: Workshop
Topic: (Model MF) Remodeling the Model M (aka.. the Mara)
Replies: 2077
Views: 104744

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

Next version of XTant pad card will have pin out so that CY8CKIT-059 can be connected with standard header pins. Actually, if you're going for this at any scale - controller can be shrunk to something like 13x18mm castellated. There's a small problem of bootstrapping the firmware - but easily solve...
by DMA
13 Jan 2019, 07:46
Forum: Workshop
Topic: (Model MF) Remodeling the Model M (aka.. the Mara)
Replies: 2077
Views: 104744

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

Muirium wrote:
13 Jan 2019, 03:38
Glad to hear it’s serving well. Got any pics?
Sure!
xtant.jpg
xtant.jpg (133.65 KiB) Viewed 897 times
https://www.instagram.com/p/BckeN1LBTaq/
It's mostly the same now, just more crumbs inside :)
by DMA
13 Jan 2019, 03:30
Forum: Workshop
Topic: (Model MF) Remodeling the Model M (aka.. the Mara)
Replies: 2077
Views: 104744

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

For those without cases, maybe the Model MF curved assembly could be mounted to a metal "frame" and left exposed? It would look pretty badass as a naked keyboard. Yeah, my (well, Muirium's, technically) naked XTant is a good conversation starter. The frame has to be sturdy tho - it's around 8 pound...
by DMA
13 Jan 2019, 03:25
Forum: Workshop
Topic: (Model MF) Remodeling the Model M (aka.. the Mara)
Replies: 2077
Views: 104744

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

Yeah, I'm around. Tentator dragged me in with the news of your return. Haven't touched the stuff for 3 months tho. Or was it four? Doing CS tech support (3 new users since summer!), but otherwise completely disconnected. Sangdrax shipped me 3 quite nice cortrons so I could add support for those to C...

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