What is this?
(https://www.nesworld.com/pics/fdscopy.jpg)
To me, it appears to be way to attach a fds to a parallel port. Am I correct?
I'm not really sure. The picture is too low-res, and it could easily be unrelated to the Famicom. Could you provide more pictures?
It's the I Line-PC, but I'm not sure what it does or if it interfaced with the Souseiki Fammy and/or a PC. I've never run across one for sale. Maybe someone else here knows something about it.
From the clips on the sides it looks like a "Centronics" micro ribbon connector typically used for parallel/printer ports. The name "I Line-PC" also sounds like you connect to some kind of personal computer, but what kind and with what purpose?
I recognize Ai-Tsuu (also written as "I2") as those that made Kosodatte-gokko, Tonkachi Editor and other hacking tools like Disk BASIC (which ports a Family BASIC ROM to an FDS disk) (https://forums.nesdev.org/viewtopic.php?p=292927#p292927).
Searching in English gave me nothing, but "コダカラくん" (Kodakara-kun) did work (https://gamecatalog.net/kodakara-kun/) and "Iライン-PC コダカラくん V2.0" (V2.1 is also there) is mentioned in catalogs as a "disk system game" sold for 9800 yen by Ai-Tsuu. There are also other Ai-Tsuu disks there, like one used to convert ROM to QD (disk), I guess using the Souseiki Fammy device.
I should probably read our own threads about the subject, found one here (https://www.famicomworld.com/forum/index.php?topic=13869).
I found it here.
https://www.nesworld.com/article.php?system=nes&data=neshardware_fds (https://www.nesworld.com/article.php?system=nes&data=neshardware_fds)
Picture is at the bottom.