The following documents can help deciding whether to upgrade to UnO or not:
Here is the free download of the UnO firmware binary image (no registration required).
Please follow these 
firmware upgrade instructions to perform the upgrade.
UnO Firmware v1.0.3 for 32Kx8 EPROMs (type 27C256)If you don't know how to handle these binary files, you might prefer to 
order a ready-made EPROM instead. Ordering a chip from me is also considered a sign of appreciation for the long nights I spent implementing the feature requests gathered from the FCB1010 community.
After upgrading to UnO, the User Guide mentioned above is a must-read. If you decide to do all the programming on the unit itself (without any kind of PC editor), you might find it helpful to have following chart at hand: