Dear Mauricio ( and to whom it may concern ); The original posting was based on a misconception that there was a Byte magazine article ( long ago ) on this subject ( adding a floppy drive to a Heathkit ET-3400 ). Since this was not true, I decided to design one myself ( I am a disgruntled ex-aerospace engineer ). The trick is to come up with "simple" solutions that are not over-kill since the ET-3400 doesn't possess a lot of processing power. Plus you need a kind of " boot ROM " to tell the 3400 how to talk to the floppy interface. Progress is being made, and I hope to have a " cost effective " solution early next year. I hope this helps. Best regards, Steven C. Dear Sir, my name is Mauricio R. araujo, retired avionics instructor. I found your message concerning this subject surfing on internet. I?m interesting about 3400 floppy Drive . could you please send any informations ?(Sorry for my English...) Mauricio