The only downside to the Wallstreet solution (to link a 512k to the modern world) is the fact they are notebooks and are more fragile than desktops as a result. The Wallstreets are also rather hard to find. I didn't find much at all on EBAY, and the 300MHz PDQ's are quite rare. A lot of what I saw had broken screen hinges or other problems that would take more time and money (and a fair chunk of money for guys like me living outside the US). That's why I was thinking more about my SE/30 as playing the role of intermediary machine, linking a 512k to say a OS X Lion iMac QuadCore. So long as the software Napabar is using works on System 7 (or perhaps up to OS 8.1), then I don't see why an SE/30 wouldn't work. But I've not yet tried the software Napabar uses to know for sure what's possible.