qmk/qmk_firmware

[Question] Vertex Pt.1/75 solder variant matrix pins (cc @JackyJia73)

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#26177 opened on Apr 26, 2026

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Description

Hi @JackyJia73 -

I'm working on a PR to add the solder variant of the Vertex Pt.1/75 to qmk_firmware as a sibling to the existing vertex/t75 (hotswap).

What I have:

  • VID: 0x28E9
  • PID: 0x3003 (vs hotswap 0x3006)
  • Matrix: 6 rows × 16 cols (vs hotswap 6×15)
  • Supports ISO Enter, split backspace, split right shift, and WK/Tsangan bottom row

The existing hotswap keyboard.json uses these matrix pins:

  • cols: B0, B2, B10, B11, A15, B3, B4, B5, B6, B7, B8, B9, B12, B13, B14
  • rows: A0, A7, A6, A5, A4, A3

I'm assuming columns 0-14 and all rows are wired identically on the solder PCB. Could you confirm:

  1. The GPIO pin for the 16th column (col 15) on the solder variant?
  2. Whether columns 0-14 and rows match the hotswap as I've assumed?

I'd be happy to submit the PR myself once I have the pin info, or if you'd prefer to handle it yourself I'll close this. Either works.

Thanks!

Contributor guide

Tech stack
c
Domain
backend
Issue type
research
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
under 1 hour
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
QMK firmware basicsKeyboard matrix wiring
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
50
Research direction
Check the schematic or existing QMK configuration for the Vertex Pt.1/75 hotswap variant to determine the GPIO pin for column 15 on the solder variant. Confirm that columns 0-14 and rows are identical between the two variants. The answer should be provided in a comment on this issue.