Thanks to everyone involved, it's now in for next weeks release.
I'm not familiar with the MSX architecture so had to make an educated guess as to where the ROM, RAM, and the 2 x cartridge slots are mapped. As the BIOS matches the Sony HB-75P I've mapped the Dragon in the same way, just without the extra ROM that the Sony has. The Sony HB-55P only has 16K whereas the HB-75P has 64K like the Dragon.