I got my Replica 1 recently and finally sat down and put it together. It worked the first time (I was impressed since I am a true novice with a soldering iron). It has successfully reminded me why I loved the 3 semesters of assembly language I took in college (graduated in 2001). However, the one thing that is NOT working like it should is the Serial I/O board, so I was wondering if anyone has any advice. When the Serial I/O board is plugged in, the Replica I operates as it should, but I don't think any data is being sent out over the serial port. I've got it hooked up to my Powerbook through a Dynex USB to Serial adapter (uses Prolific chipset). I haven't had any problems with the adapter, but the Mac drivers are a little flaky (but EVERYTHING I've tried will work in Virtual PC when it uses the PC drivers). When I've got it connected to the Replica 1, it does not appear to send/receive any data at all (I tried with ZTerm on the Mac and HyperTerminal through VPC, both produce nothing). I've tweaked everything I can think of with the connection, but have had no luck.