Quick question for the users already with an interface, can someone try it in an MSX1? I have no msx1 at hand. Questions are ask if it works in MSX1 and it should work in MSX1 but I cannot confirm. Especially in vg-8020. I should have taken the old one which is at my brothers home 
Thanks for trying!
Thankyou for testing! 
Waiting for results...
Leo, indeed I have a limited amount but the limit is not reached yet. I can still make around 25 pieces.
After that I can order a new batch of PCBs if necessary
Succes!
Yesterday I made the PCB fit into a Sub-Logic Flight Simulator casing. I extended the holes in the PCB 'up north' just far enough to get the cartridge connector in the right place, and not damage any traces. A close call, but it's possible. I'd upload some pix, but my camera recently died 
Soldered everything onto the board (no sockets used). Not a job for beginners but I'm not, and the result looks good. Replaced capacitors with SMD tantalum types to cut down on the vertical size, and added some ceramic ones for better power supply decoupling. After thorough inspection, a first try - jay! IMHO unnecessary feature, but helpful that it's bootable without an SD card inserted.
Today bought a few SD cards, and booting from / reading & writing functions for both SD slots (strange that the one on the back becomes C: and the front one becomes D: btw). So it looks like I'm in business!
To do: more cartridge case modding, add LEDs, get to know the software that comes with it (and its 
oddities), replace label with something less ugly.
