I added a PS/2 keyboard interface to the system, which makes it possible to play a bit with the Basic.
Fabrice Frances also provided me a modified ROM that is able to somewhat "resume" the execution of the system, from a memory dump that can be done from his well-known emulator, Euphoric. So I designed a memory loader, that downloads the contents from such a dump into memory, with the help of a FTDI USB module. First results look nice :)

EDIT : DBug gave me some tips to fix the .TAP files header (disabling the autostart) and retreive information from it (like the start address). It means that along with Fabrice's ROM, it now brings a great testing solution :) Here you can see some of his demos running.