I finally started to analyze the SORD M68 keyboard.
It has been a struggle since my first attempt.
Compared to the M68MX, there are so many general-purpose logic ICs and almost no dedicated ICs.
In particular, apparently, all the circuits related to the keyboard are made up of only general-purpose logic ICs.
I'm getting a little fidgety, but I'll do it bit by bit.
This time, I looked up the connection information from the keyboard connector to Vdd, GND, and just one pin.
I can't remove this sub-board for PLL, so I don't know what's going on underneath. Does anyone know how to remove it?
