The Kuritakey Brand M0110A rejuvenation PCB

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soyuz

07 Sep 2021, 23:34

A faithful re-creation of the M0110A PCB, with some nice QoL features, reasonably accurate markings and a silly cable system to preserve the external appearance of the keyboard. I know that the elmo M0110A PCB is out there, but it doesn't support Mitsumi and also uses a pain in the arse chip.

Status
Prototypes TESTED on SKCC M0110A
Awaiting Mitsumi beta testers to report back

Features
  • Mitsumi Standard and Alps SKCC
  • Supports Pro Micro or Pi Pico as MCU
  • Preserves keyboard appearance with some smart cable chopping and re-use of the original 4p4c connector
  • N-Key Rollover - through-hole or surface-mount diodes
  • Supports ANSI mod (ANSI backslash, 2.25u right shift)
  • Optional lock light underglow LEDs (requires some minor hand wiring)
  • QMK and VIA firmware (Pro Micro only for now, Pi Pico will use KMK until QMK is ported)
Pictures
kicad_zpLRcAGtX2.png
kicad_zpLRcAGtX2.png (102.07 KiB) Viewed 1532 times
kicad_R7Y7hyoVMg.png
kicad_R7Y7hyoVMg.png (134.13 KiB) Viewed 1532 times
Fun
This PCB is designed to be unobtrusive as possible! It will ship in classic green and carries faithful markings copied from the SKCC version of the original PCB. Modern markings kept to an absolute minimum.
kicad_N4ee0Wpc1E.png
kicad_N4ee0Wpc1E.png (28.46 KiB) Viewed 1532 times
kicad_jhNvn1KimW.png
kicad_jhNvn1KimW.png (50.48 KiB) Viewed 1532 times
Last edited by soyuz on 04 Oct 2021, 22:11, edited 4 times in total.

TheNeonKnight

07 Sep 2021, 23:51

Love what you have done here, would you be willing to make a tweak to split the 0 and Enter on the numpad?

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goomba_

07 Sep 2021, 23:57

very interested in this, the 2 key rollover on the original is painful to use

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soyuz

08 Sep 2021, 00:18

TheNeonKnight wrote:
07 Sep 2021, 23:51
Love what you have done here, would you be willing to make a tweak to split the 0 and Enter on the numpad?
The only issue with splitting is the Mitsumi footprints colliding with the non-split Mitsumi one (see the 2.25U right shift which just can't be done with Mitsumi pinout. I ideally want to keep jank like that to a minimum, sorry :(

User avatar
zrrion

08 Sep 2021, 03:44

would flipping the switch 180 for the split positions on the numpad have enough clearance? IIRC the cruciform mount is rotationally symmetrical so it should be fine for whatever caps are used

nobatron

08 Sep 2021, 09:44

great work, looking forwards to this

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TNT

08 Sep 2021, 11:26

Mine is sitting in my closet because the 2kro was ruining the fun for me. Love the board otherwise, so I'm very interested in this.

Adding locklights also sounds like a dream :)

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soyuz

17 Sep 2021, 01:00

Prototypes ordered, will report back when they arrive.

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soyuz

27 Sep 2021, 18:27

Prototypes arrived (in Prototype Purple!) - partway assembled at the moment, will update again when fully assembled.

Some minor issues spotted when seen IRL (as is to be expected) but fixes are easy. Those issues were:

- Mounting peg holes for 4p4c connector slightly off
- One diode collides with 4p4c connector housing when soldered through hole
- Pro micro footprint wasn't flipped, which makes plugging in cable kind of bait but doable.

All of these are workaroundable at present but will be sorted before any GB.

On the plus side:

- Fitment is perfect
- Electrically 100%
Attachments
Front
Front
20210927_171844.jpg (3.46 MiB) Viewed 876 times
Back
Back
20210927_171857.jpg (3.57 MiB) Viewed 876 times

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ironicmoustache

27 Sep 2021, 18:31

Definitely getting at least one of these when the GB launches. I really like the M0110A but 2KRO is a serious pain when I'm typing up a storm.

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TNT

27 Sep 2021, 19:28

Looks great! I'm in with 2. Do you have a rough estimate of how much time it will take until the GB starts?

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soyuz

27 Sep 2021, 19:36

It's gonna be a while - another prototyping round required. Numpad was offset just enough to make it impossible to put the pcb on ._.

I don't feel comfortable selling this til I've put a prototype on the keyboard and it works.

Edit: this is because Apple put the numpad 9/16 of a unit away from the alpha block. You gotta be kidding me.

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TNT

27 Sep 2021, 20:59

Sounds like a thing Apple would do. Thanks for the update!

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soyuz

27 Sep 2021, 23:51

Next prototypes ordered - hopefully they make it out before Chinese holidays

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soyuz

04 Oct 2021, 15:47

New prototypes are in, alignment issues look resolved. Will assemble and test tonight

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soyuz

04 Oct 2021, 22:10

Working fine on SKCC M0110A :D

Waiting on Mitsumi testers to test that and then I'm happy to move toward a GB. Pics soon.

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TNT

04 Oct 2021, 22:40

Very nice!

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soyuz

05 Oct 2021, 00:13

Here we go! Unfortunately the 4p4c to USB cable I made looks super bad cause I was shivering in my cold cellar at the time, so haven't bothered showing that.
Attachments
silks.jpg
silks.jpg (3.57 MiB) Viewed 418 times
pro micro to 4p4c wiring.jpg
pro micro to 4p4c wiring.jpg (3.69 MiB) Viewed 418 times
front.jpg
front.jpg (3.3 MiB) Viewed 418 times
4p4USB.jpg
4p4USB.jpg (3.13 MiB) Viewed 418 times

TheNeonKnight

14 Oct 2021, 23:10

Nice to see this is coming along so well

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TNT

15 Oct 2021, 00:18

your profile pic is great btw 8-)

TheNeonKnight

25 Oct 2021, 03:23

Very excited to see this

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