The Kuritakey Brand M0110A rejuvenation PCB

[soyuz]

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
On sale NOW at kuritakey.store - Until December 1st

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)

• QMK and VIA firmware (Pro Micro only for now, Pi Pico will use KMK until QMK is ported)

Pictures

kicad_zpLRcAGtX2.png (102.07 KiB) Viewed 20813 times

kicad_R7Y7hyoVMg.png (134.13 KiB) Viewed 20813 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 (28.46 KiB) Viewed 20813 times

kicad_jhNvn1KimW.png (50.48 KiB) Viewed 20813 times

[TheNeonKnight]

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

[goomba_]

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

[soyuz]

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

[zrrion]

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]

great work, looking forwards to this

[TNT]

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

[soyuz]

Prototypes ordered, will report back when they arrive.

[soyuz]

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%

[ironicmoustache]

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.

[TNT]

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

[soyuz]

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.

[TNT]

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

[soyuz]

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

[soyuz]

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

[soyuz]

Working fine on SKCC M0110A

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

[TNT]

Very nice!

[soyuz]

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.

[TheNeonKnight]

Nice to see this is coming along so well

[TNT]

your profile pic is great btw

[TheNeonKnight]

Very excited to see this

[soyuz]

Preliminary testing looks like the Mitsumi footprints work okay - I am likely to run a combined M0110 / M0110A GB very shortly.

[depletedvespene]

This might be what I need to revive an M0110A I got here "for spares". Looking forward to this!

[TNT]

All of this is very exciting. Can't wait to have mine in hand!

[soyuz]

https://kuritakey.store