Search found 513 matches

by DMA
13 Apr 2019, 21:15
Forum: Workshop
Topic: Restoring&Converting the IBM 4978 Beamship
Replies: 29
Views: 1731

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: 1731

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: 406
Views: 27855

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: 406
Views: 27855

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: 2074
Views: 98923

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: 406
Views: 27855

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: 40826

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: 2074
Views: 98923

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: 2074
Views: 98923

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: 10
Views: 430

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: 2074
Views: 98923

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: 410

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: 381

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: 2074
Views: 98923

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: 2561

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: 2561

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: 2074
Views: 98923

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: 2074
Views: 98923

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 700 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: 2074
Views: 98923

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: 2074
Views: 98923

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...
by DMA
05 Jan 2019, 23:31
Forum: Workshop
Topic: [Done] CommonSense controller - better capsense!
Replies: 406
Views: 27855

yes sorry, wanted to write rows :) so the 8 listed ones are the correct ones? the solenoid daughterboard from xwhatsit is something complex or could I just handwire a couple of resistors and caps myself? No, it's a small boost converter + triggering circuit. So I doubt you can handwire that :) http...
by DMA
05 Jan 2019, 19:13
Forum: Workshop
Topic: [Done] CommonSense controller - better capsense!
Replies: 406
Views: 27855

Hi Again DMA, quick double-check: so the 8 columns would be: 2.0, 2.3, 2.4, 2.5, 2.6, 2.7, 12.7 and 12.6, correct? Those are rows. Can only be 8 of those. Columns are 1.0, 1.1, 1.2... - up to 24 of those. also: can you drive a solenoid with this board? You'll need xwhatsit solenoid daughterboard fo...
by DMA
21 Dec 2018, 02:47
Forum: Workshop
Topic: [Done] CommonSense controller - better capsense!
Replies: 406
Views: 27855

Congratulations! :) after years I'm finally ready to bring my FEXT to live and do it with the CapSense!! First of all, happy to see the great success here! This will soon even be Bluetooth... omg.. :) I dunnot about BLE, haven't touched keyboards in like 3 months. Work, y'know :( So to avoid errors,...
by DMA
06 Oct 2018, 05:00
Forum: Workshop
Topic: [Done] CommonSense controller - better capsense!
Replies: 406
Views: 27855

Hi DMA, thanks for building CommonSense, it looks awesome and I'm keen to give it a go. I have an IBM model F that looks like a 3178 without the blue switch, but the PCB layout is a bit different. It has 4 rows and 23 columns, as far as I can tell. I thought I'd have a go at getting it wired up usi...
by DMA
16 Sep 2018, 23:59
Forum: Workshop
Topic: Data general protocol
Replies: 1
Views: 186

patent says KBIRQ is generated by keyboard when it has something to say (also periodically, every 8 keyboard scans), along with the CLK. So after reset pulse you should see periodic KBIRQ pulses and clock. Connect scope to serial in, press keys, see what's there. It seems from description that termi...
by DMA
09 Sep 2018, 17:52
Forum: Workshop
Topic: [IC] Qi wireless charging?
Replies: 3
Views: 283

Yeah, this is more of "design the whole keyboard" territory. Also people knowing china say that qi receiver with 5V output costs about $1. So there's that.
by DMA
09 Sep 2018, 07:04
Forum: Workshop
Topic: [IC] Qi wireless charging?
Replies: 3
Views: 283

[IC] Qi wireless charging?

Looks like $8 controller (BGA only, so MOQ applies because PCBA required) + $4 coil gets you wireless charging.
Question is - will there be any interest in that?
by DMA
09 Sep 2018, 03:03
Forum: Workshop
Topic: How much runtime is enough for BT keyboard?
Replies: 1
Views: 191

How much runtime is enough for BT keyboard?

I soldered the prototype BLE controller - https://www.instagram.com/p/BnetblTAO41/ There are some lessons from that - main one is "never use 0.05" pin pitch". It consumes 22mA from fully-charged battery. Means about 20 hours from 500mAh - may be a bit less. So the question is "how much runtime is en...
by DMA
01 Sep 2018, 10:44
Forum: Workshop
Topic: CommonSense controller for digital piano project?
Replies: 48
Views: 1820

Mu, what tricks are possible with 3 sensors that are not possible with 2? Whole new world to me, interesting what's there
by DMA
31 Aug 2018, 08:48
Forum: Workshop
Topic: CommonSense controller for digital piano project?
Replies: 48
Views: 1820

wooting texts are a bit bulshitty. like "we use analog input so we can't have matrix". Also they don't need debouncing because IR switches don't bounce. What they need is EMI rejection. Which they can do with jacking up scanning speed to, say, 5kHz and have sub-1ms latencies (which are not that usef...

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