Spanish Scene still produce games on this media...maybe the Nostalgia or pure masochism.
Tapes are known for wasting 20 minutes only to find out that the load screwed up because the magnetic tape is not that reliable due to parasistic noises.
A problem encountered with this format standard lies when the software have to take control of the Datacorder (to stop or play...)
As no CD reader nor MP3 reader were designed on this purpose, you have to do it manually.
Also a This problem lies is critical when a software needs frequent Data readingReading/Writing. ==the strange case of the 6128+==
Oddly, the 6128+ do does not have any Tape connection connector at all.
But as the Mainboard is the same one on the 464+ and the 6128+ you can easily fix this if you cannibalize a 464+ to improve your 6128+(or find the proper electronic componnents).
Just pierce a hole in the plastic, put a Jack connector and use it for small games with any mp3 walkman.
More complex games or softwares should better use a Disk-like systemsolution (no pun intended).