I had the board with the kicad project attached in the previous post (plus some errors i fixed before posting) manufactured, assembled it and flashed the firmware available on Tekwiki (
https://w140.com/tekwiki/images/8/86/160-1916-01.bin) into the eprom.
Most of the ICs I used are exactly identical wo the ones in the wikis image. Some similar versions also work (refer the Service Manual Volume II on that).
After installing the PCB the power on selftest has an additional line and the utility menu has the new page visible in the screenshot. By the way: If you hold down any button while booting the keyboard selftest fails on purpose and you can use the testmenu.
When I designed the board there was no pcb mount connector available (at least in Germany) with a reasonable lead time, so i did some large smd pads to directly attach wires. You might want to change that to your liking. Some pictures are attached.
A note on the image: The capacitors on the SMD pads are supposed to be 1206, but i was out of those so i used through hole ones instead.
I had to tilt hte LEDs because they are to near to the boards edge.
I did not have time to create a case for the pcb. It can be tricky to get the pcb correctly into the connector. Maybe the pcb thickness is not correct or maybe a case is needed to hold it straight.
I attached the current state of the pcb, please note that I have not yet had this one produced so I can't verify its working without issues. A lot of components are now SMD, a modern replacement for the obsolete Q345 (Type IRFF122 N-Channel MOSFET) is still missing.
I hope this helps, feel free to ask if you want to know something in more detail!