Hi
@naruse I managed to create the cable but I made an adapter from DB25 to DB9, but I think to conver din-8 to DB25 is the same way.
You can get the manual
here! But importante to mentioned that is a RS422 protocol and follow different specification of we use nowaday.
If you want to connect to a old mac computer that are capable to communicate using this protocol, you can only rewire the pinout cable, but if you want a today's computer, I suggest watch this
video were a user made exactly what you want.
Of course, the video suggest to use an Arduino as interface to print image, but you can see in the video that the converting R2422 to RS232 the communication happen, so you can just install some driver to use serial printer or use a putty to make this communication happen.
This is the pinout to use DB25:
View attachment 77890
I hope its bring some light in the end of tunnel for you!