I connected paxon keyboard to ntt captain msx, but it seems pinout description is wrong for ntt captain related to X4-X7 pin order.
Pins 14-17 shuold be X4,X5,X6,X7 (not X7,X6,X5,X4)
I double checked that paxon keyboard pinout was correct (from keyboard pcb and also from cable pins), the error is in ntt captain side description.
here is keyboard pinout for toshiba hx34:
so the pins K0-K7 are used for X0-X7, but also pins K0-K3 are used for Ya,Yb,Yc,Yd
so only some special members can edit the corresponding wiki pages, right?
Ntt captain keyboard pinout is wrong also related to CAPS and KANA pins. Those are actually mixed up in that picture (https://www.msx.org/wiki/File:Captain_ntt_keyboard_pinout_-_...). The right pin for CAPS is 23, and for KANA is 24.
Some keyboard schematics + key matrix:
Sony HB-701FD.
Mitsubishi ML-G30 (already posted here).
Pioneer PX-V60 (same as PX-7).