Model F Technical Manual Project

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darkcruix

24 Sep 2020, 14:50

ckafi wrote:
24 Sep 2020, 10:56
This is such a cool project. Kudos! I see you've already got pictures of a battleship, but would you be interested in some of one with original german/APL keycaps?
Thanks - a pic of a Battleship with APL keys would be awesome!!!! I have planned to get an Appendix made that contains all sorts of original variations and curiosities. Whenever I concentrate on one aspect, an explosion of new ideas come to mind (and sometimes they go too far :lol: ).

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darkcruix

29 Sep 2020, 15:05

I have created a small web page for the Model F Technical Manual Project that also provides the latest version of the PDF for download. In a later stage, I plan to provide also all sorts of keyboard layouts, firmware files and links to the respective github resources.
Anyway, the webpage: https://www.bucklingspring.com

Let me know, what you think ...

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darkcruix

01 Oct 2020, 17:21

Just pasted a minor update of the manual at:
https://www.bucklingspring.com/download ... reference/
We're at 139 pages now ...

Request: I would need a picture at good resolution from the backside of a ULTRA COMPACT model with the USB cable attached and without. If anybody can send me one, it would be of great help!

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darkcruix

06 Oct 2020, 22:18

The new update from today increased the page count to 164. In this version I documented the process to open the Barrel Plate Sandwich and a few repair guides around it.
https://www.bucklingspring.com/downloads/

I am happy to add more guides, if I get hints on what to include.

User avatar
darkcruix

10 Oct 2020, 00:32

I added a lot of content today into the latest version of the manual (0.5.9).
I am open to suggestions on what people would either like to read or think would be a good topic to explain. As usual the download is available from: https://www.bucklingspring.com/downloads/. There is a large version (243MB) for printing and a small version for on-screen viewing (60 MB). Both versions have the same content (176 pages), just the picture size is reduced on the second.

Among other things I added the following sections to the manual underneath the Hardware Guides and Reference:
  • Case Disassembly
  • USB cable replacement
  • Opening and Closing the Barrel Plate Sandwich
    - The Sandwich Dissection
    - Closing the Sandwich
    - All parts of the Barrel Plate Sandwich
  • Open Assembly Repairs
    - Remove Plastic Stabilizers
    - Testing Problematic Keys
    - Flipper Cleaning / Switching
    - Replacing the Foam
    - Creating a Foam Cutout from Scratch
  • Changing the Layout
    - Populating ever Key on a F62
    - Change from 2U key to 2 x 1U
    - ANSI Mod for Original IBM F107

Coeus

12 Oct 2020, 12:30

I opened the larger version in evince and it is working fine for me. I did notice that the first photo in the "Photos of Brand New Models" looks quite distorted - the the one that says it is just a placeholder. Note that the front edge appears to be curved when I assume it is straight and whole keyboard appears to be convex with the centre closer to us than the edges.

Ideally you want to avoid taking pictures of things close to the camera with a wide-angle lens. Bear in mind that single-lens mobile phone cameras tend to be wide-angle and then use digital zoom. Better to take the picture with a decent camera if you have one or, if you have a two lens mobile phone, zoom in just enough (and therefore move the phone further away) that it is using the normal/telephoto lens rather than the wide-angle.

Coeus

12 Oct 2020, 12:32

This is the photo I refer to in my previous post.
screenshot.png
screenshot.png (243.18 KiB) Viewed 319 times

User avatar
darkcruix

12 Oct 2020, 14:08

Thanks - I will replace this photo in the next iteration.
I am using a Canon EOS 250D with several original Canon lenses. As I shoot everything in RAW, I have to apply lens correction over all of them. Pictures I put in as placeholders are not corrected, but will be done so in the final product. The below has also the correct lighting I normally use, just the angle will be adjusted and height I shoot it from.
Screen Shot 2020-10-12 at 14.15.53.jpg
Screen Shot 2020-10-12 at 14.15.53.jpg (161.31 KiB) Viewed 297 times

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darkcruix

13 Oct 2020, 17:18

Uploaded a new version (0.5.11) with several mostly cosmetic changes. Only correction I made is on page 4-48 with two new illustrations.
Spoiler:
Full_Keyboard_Explosion.jpeg
Full_Keyboard_Explosion.jpeg (103.38 KiB) Viewed 249 times

Zcool31

15 Oct 2020, 18:49

darkcruix wrote:
13 Oct 2020, 17:18
Uploaded a new version (0.5.11) with several mostly cosmetic changes. Only correction I made is on page 4-48 with two new illustrations.
Spoiler:
Full_Keyboard_Explosion.jpeg
That's beautiful.

User avatar
darkcruix

15 Oct 2020, 18:52

Zcool31 wrote:
15 Oct 2020, 18:49
darkcruix wrote:
13 Oct 2020, 17:18
Uploaded a new version (0.5.11) with several mostly cosmetic changes. Only correction I made is on page 4-48 with two new illustrations.
Spoiler:
Full_Keyboard_Explosion.jpeg
That's beautiful.
your illustrations, Sir.... are beautiful

User avatar
darkcruix

23 Oct 2020, 12:14

I need technical help to explain (in approximation) the sensing of the capacitive PCB.
To make it easier, I have created a 2x2 matrix with sensing pads on the backside and front side as shown in the picture below.
I want to describe how the sensing would work, if
* key A is pressed
* keys A and B are pressed
* keys A and C are pressed
* keys A, B, D are pressed
What I have read, I would interpret it as sending a pulse current through column C1 and measure capacitance on R1, R2, then send an impulse current through Column C2 and measure then start from R1 again (and doing this 100 times a second). This might be completely wrong, please correct me.
Illustration-2x2Matrix.jpg
Illustration-2x2Matrix.jpg (269.12 KiB) Viewed 109 times

Zcool31

23 Oct 2020, 22:17

Your intuition is about right. The controller sends a pulse on C1, then measures R1 and R2 at the same time. All the Rs are connected to different pins, so they are measured in parallel. Then the controller turns off the C1 pin, sends a pulse on C2, and measures R1 and R2 in parallel again. All the Cs are also connected to their own pins, distinct from the pins to which the Rs are connected. The whole cycle, [C1, C2], repeats 100 times per second.

User avatar
darkcruix

23 Oct 2020, 23:20

Zcool31 wrote:
23 Oct 2020, 22:17
Your intuition is about right. The controller sends a pulse on C1, then measures R1 and R2 at the same time. All the Rs are connected to different pins, so they are measured in parallel. Then the controller turns off the C1 pin, sends a pulse on C2, and measures R1 and R2 in parallel again. All the Cs are also connected to their own pins, distinct from the pins to which the Rs are connected. The whole cycle, [C1, C2], repeats 100 times per second.
Thanks! Find attached the 4 pages I wrote around it. Mostly contains graphics that show (in my super high level variant) how the matrix sensing roughly works.
SensingPCB.pdf.zip
(1009.73 KiB) Downloaded 4 times

User avatar
darkcruix

24 Oct 2020, 01:41

I updated the manual to version 0.5.14 today.
It contains various additions in section 4 (Capacitive PCB, Sensing PCB Circuitry, PCB-Pinout).

Download via: https://www.bucklingspring.com with either full size or reduced illustrations.

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